John 3-ett 
 
AN ABRIDGMENT 
 
 HYGIENIC PHYSIOLOGY, 
 
 WITH SPECIAL REFERENCE T 
 
 ALCOHOLIC DRINKS AND NARCOTICS. 
 
 FOR THE USE OF JUNIOR CLASSES AND COMMON SCHOOLS. 
 
 BY 
 
 JOEL DORMAN STEELE PH.D. 
 
 A. S. BARNES & COMPANY, 
 
 NEW YORK AND CHICAGO. 
 
 (Copyright, 1873, 188k.) 
 
tiVCftl I*": 
 
 . . ',* . "PME* FbORTEEN-WEEKS SERIES 
 
 IN 
 
 NATURAL SCIENCE 
 
 BY 
 
 J. DORMAN STEELE, PH.D., F.G.S. 
 
 New Physics. Human Physiology. 
 
 New Chemistry. Zoology. 
 
 Popular Geology. Botany. 
 
 New Descriptive Astronomy. 
 
 Hygienic Physiology. 
 
 Hygienic Physiology, Abridged. 
 
 The Publishers can supply (to Teachers only) a Key containing Answers 
 to the Questions and Problems in Steele's entire Series. 
 
 __:_^ 
 BARNES' HISTORICAL SERIES, 
 
 ON THE PLAN OF 
 
 STEELE'S FOURTEEN-WEEKS IN THE SCIENCES. 
 
 A Brief History of the United States. 
 A Brief History of France. 
 
 A Brief History of Ancient Peoples. 
 
 A Brief History of Mediaeval and Modern Peoples. 
 A Brief General History. 
 
 A Brief History of Greece. 
 
 A Brief History of Rome. (Nearly Ready.) 
 
 A Popular History of the United States. 
 

 SUGGESTIONS TO TEACHERS. 
 
 OEEING is believing, more than that, it is often 
 O knowing and remembering. The mere reading 
 of a statement is of little value compared with the 
 observation of a fact. Every opportunity should 
 therefore be taken of exhibiting to the pupil the 
 phenomena described, and thus making them real. 
 It is hoped that the simple Experiments scattered 
 through the text will be performed. The skilful 
 teacher will be able to draw from them much valu- 
 able instruction. A microscope is indispensable to 
 the proper understanding of Physiology. A suitable 
 instrument and carefully prepared specimens show- 
 ing the structure of the bones, the skin, and the 
 blood of various animals, the pigment cells of the 
 eye, etc., may be obtained at a small cost from the 
 Publishers of this book. 
 
 On naming the subject of a paragraph, the pupil 
 should be prepared to tell all he knows about it. No 
 failure should discourage the teacher in establishing 
 this mode of study and recitation. A little practice 
 will produce the most satisfactory results. The un- 
 expected question and the apt reply develop a certain 
 
 5 43510 
 
6 SUGGESTIONS TO TEACHERS. 
 
 sharpness and readiness which are worthy of cultiva- 
 tion. The Practical Questions, the Questions for 
 Review, or any other that the wit of the teacher may 
 suggest, can be effectively used to break the mono- 
 tony of a topical recitation, thereby securing the 
 benefits of both systems. Many additional Practical 
 Questions, and interesting Notes will be found in the 
 Hygienic Physiology. 
 
 The pupil should expect to \>e questioned each day 
 upon any subject passed over during the term, and 
 thus the entire knowledge gained will be within his 
 grasp for instant use. While some are reciting to the 
 teacher, let others write on slates or on the black- 
 board. At the close of the recitation let all criticise 
 the ideas, the spelling, the use of capitals, the pronun- 
 ciation, the grammar, and the mode of expression. 
 Greater accuracy and much collateral drill may thus 
 be secured at little expense of valuable school-time. 
 
 The Introduction is designed merely to furnish 
 suggestive material for the first lesson, preparatory 
 to beginning the study. Other topics may be found 
 in the questions given in the Appendix. 
 
 To the description of each organ is appended an 
 account of its most common diseases, accidents, etc. , 
 and, when practicable, their mode of treatment. A 
 pupil may thus learn, for example, the cause and cure 
 of a cold, the management of a wound, or the nature 
 of an inflammation. 
 
 In the Appendix will be found Questions for Re- 
 view, Hints about the sick-room, Suggestions as to 
 "what to do till the doctor comes," Antidotes for 
 poisons, a Glossary, and an Index. 
 
TABLE OF CONTENTS. 
 
 PAGE 
 
 INTRODUCTION 9 
 
 I. 
 THE SKEL ETON 11 
 
 I I. 
 THE MUSCLES 25 
 
 III. 
 THE SKIN 35 
 
 I V . 
 RESPIRATION AND THE VOICE 49 
 
 V. 
 THE CIRCULATION ^7 
 
 VI. 
 DIGESTION AND FOOD 91 
 
 VII. 
 THE NER VOUS SYSTEM. . 115 
 
TABLE OF CONTENTS. 
 VIII. 
 
 PAGE 
 
 THE SPECIAL SENSES 139 
 
 1. TOUCH 139 
 
 2. TASTE 141 
 
 3. SMELL 142 
 
 4. HEARING 143 
 
 5. SIGHT 145 
 
 IX. 
 
 CONCLUSION 155 
 
 X. 
 
 APPENDIX 159 
 
 1. HINTS ABOUT THE SICK-ROOM 159 
 
 2. DISINFECTANTS l6o 
 
 3. WHA T TO DO " TILL THE DOCTOR COMES 1 ' 160 
 
 4. ANTIDOTES TO POISONS 166 
 
 5. QUESTIONS FOR REVIEW 168 
 
 6. GLOSSARY 183 
 
 7. INDEX 189 
 
INTRODUCTION. 
 
 PHYSIOLOGICAL STUDY in youth is of in- 
 estimable value. Precious lives are frequently 
 lost through ignorance. Thousands squander 
 in early years the strength which should have been kept 
 for the work of real life. Habits are often formed in 
 youth which entail weakness and poverty upon manhood, 
 and are a cause of life-long regret. The use of a strained 
 limb may permanently damage it. Some silly feat of 
 strength may produce an irreparable injury. A thought- 
 less hour of reading by twilight may impair the sight for 
 life. A terrible accident may happen, and a dear friend 
 perish before our eyes, while we stand by powerless to 
 render the assistance we could so easily give did we " only 
 know what to do." The thousand little hints which may 
 save or lengthen life, may repel or abate disease, and the 
 simple laws which regulate our bodily vigor, should be so 
 familiar that we may be quick to apply them in an emer- 
 gency. The preservation of health is easier than the cure 
 of disease. Childhood cannot afford to wait for the les- 
 son of experience which is learned only when the penalty 
 of violated law has been already incurred, and health 
 irrevocably lost. 
 
 Nature's Laws Inviolable. In infancy, we learn 
 how terribly Nature punishes a violation of certain laws, 
 and how promptly she applies the penalty. We soon find 
 out the peril of fire, falls, edged-tools, and the like. We 
 fail, however, to notice the equally sharp and certain 
 
10 INTRODUCTION. 
 
 punishments which bad habits entail. We are quick to 
 feel the need of food, but not so ready to perceive the 
 danger of an excess. A lack of air drives us at once to 
 secure a supply ; but foul air is as fatal, yet gives us no 
 warning. 
 
 Nature provides a little training for us at the outset of 
 life, but leaves the most for us to learn by bitter expe- 
 rience. So in youth we throw away our strength as if it 
 were a burden of which we desired to be rid. We eat 
 anything, and at any time ; do anything we please, and 
 sit up any number of nights with little or no sleep. Be- 
 cause we feel only a momentary discomfort from these 
 physical sins, we fondly imagine when that is gone we are 
 all right again. Our drafts upon our constitution are 
 promptly paid, and we expect this will always be the case; 
 but some day they will come back to us protested; Nature 
 will refuse to meet our demands, and we shall find our- 
 selves physical bankrupts. 
 
 We are furnished in the beginning with a certain vital 
 force upon which we may draw. We can be spendthrifts 
 and waste it in youth, or be wise and so husband it to 
 manhood. Our shortcomings are all charged against this 
 stock. Nature's memory never fails : she keeps her ac- 
 count with perfect exactness. Every physical sin sub- 
 tracts from the sum and strength of our years. We may 
 cure a disease, but it never leaves us as it found us. We 
 may heal a wound, but the scar still shows. We reap as 
 we sow, and we may either gather in the thorns, one by 
 one, to torment and destroy, or rejoice in the happy har- 
 vest of a hale old age. 
 
THE SKELETON. 
 
 THE Skeleton, or framework of the " House we 
 live in," is composed of about 200 bones. The 
 number varies in different periods of life, several 
 which are separated in youth becoming united in old 
 
 The Uses of the Bones are chiefly : First, to pro- 
 tect the delicate organs within us ; Second, to aid the 
 muscles in producing motion ; and Third, to keep 
 the body in shape. 
 
 The Forms of the Bones are adapted to their 
 various uses. 
 
 Experiment. Cut a sheet of foolscap into two pieces. Make of one 
 a firm, hollow roll, and of the other a close, flat strip. Support the ends 
 of each, and hang weights in the middle. The roll will bear a much heavier 
 weight than the strip. 
 
 Now, in our limbs, we need size, strength, and 
 lightness, in order to carry burdens, to bear the body 
 in walking, and to furnish a support for the muscles ; 
 hence, we here find long, round, hollow bones. Over 
 cavities we have flat bones, and where we require 
 strength in a small space we have short, thick ones. 
 
 The Bones are Composed of animal and mineral 
 matter, the proportion varying with the age. 
 
 Experiments. 1. Take two bones. Soak one in weak muriatic acid, 
 and burn the other in the fire. The shape of both will remain unchanged, 
 
THE SKELETON. 
 
 HuV^S? oTiB'beco t me;s.'i tqugh, gristly substance (cartilage), while the other 
 can be crumbled into powder. The acid has destroyed the mineral, the fire 
 has consumed the animal, matter. 2. Mix a wineglass of muriatic acid 
 with a pint of water, and place in it a sheep's rib. In a day or two, the 
 bone will be so soft that it can be tied into a knot. 3. In the same way, 
 an egg may be made so pliable that it can be crowded into a narrow-necked 
 bottle, within which it will expand, and become an object of great curiosity 
 to the uninitiated. 4. Compare the breast-bone of a young and an old fowl. 
 
 We thus see that a bone receives hardness and 
 Fig. 2. rigidity from its mineral, and tenacity 
 and elasticity from its animal, matter. 
 
 All b(jnes are at first either simple 
 tissue or cartilage, which gradually os- 
 sifies (turns to bone). Certain portions 
 near the joints ossify very slowly, and 
 so, meantime, keep tough and elastic. 
 Hence the bones of children are not 
 readily fractured, and when broken 
 easily heal again ; while those of elderly 
 people are liable to fracture, and do not 
 quickly unite. 
 
 The Structure of the Bones may be 
 easily illustrated. 
 
 Experiments. 1. Saw a bone lengthwise. You 
 will find it filled with a spongy substance. At the ends, 
 where size is required to make a strong joint, this filling 
 is abundant and porous ; while, near the middle, where 
 strength alone is needed, the bone itself is thicker. 
 Each fiber of this filling eases the shock of a sudden 
 blow. 2. Examine a freshly-cut bone. It is not the 
 The thigh-bone^or dry, lifeless thing you may have supposed, but a moist, 
 Ur^ihwlse. pinkish structure, covered with a ^ough membrane, and 
 
 containing a rich fat marrow, full of blood-vessels. 
 
GROWTH OF THE BONES. 3' 
 
 3. Put a thin slice under the microscope. You will 'see* MacV spbtS, ^fath '' 
 lines running in all directions, and looking very like minute insects. The 
 spots are little cavities, and the lines are tiny tubes. 
 
 Growth of the Bones. The blood circulates freely 
 through the bones, and the whole bone-structure is 
 constantly but slowly changing, old material being 
 taken out and new put in. A curious illustration is 
 seen in the fact that if madder be mixed with the 
 food of pigs, it will tinge their bones red. 
 
 Repair of the Bones. If you break a bone, the 
 blood at once oozes out of the fractured ends. After- 
 ward comes a watery fluid, which in a fortnight 
 thickens to a gristly substance strong enough to hold 
 them together. Bone-matter is then slowly depos- 
 ited, which in five or six weeks will unite the broken 
 parts. 
 
 A broken limb should always be held in place by 
 splints ; a sudden jar might rupture the partially- 
 mended break. As, for a long time, the new portion 
 consists largely of animal matter, and so is tender 
 and pliable, great care is necessary to prevent a mis- 
 shape of the bone. 
 
 The Joints are packed with a soft, smooth carti- 
 lage, or gristle. In addition, the ends of the bones 
 are covered with a thin membrane that secretes a 
 fluid, not unlike the white of an egg, which prevents 
 the noise and wear of friction. The body is the only 
 
 v " 
 
 niachine that oils itself. 
 
 The bones which form the joint are tied with stout 
 ligaments, or bands, of a smooth, silvery-white tis- 
 sue, so strong that the bones are sometimes broken 
 without injuring the fastenings. 
 
THE SKELETON. 
 
 Fiq. 3. 
 
 The 8fcuZl.l, frontal bone ; 2, parietal bone ; 5, temporal bone ; A, the sphenoid 
 bone ; 5, ethmoid bone ; 6, superior maxillary (upper jaw) bone ; 7, malar bone 
 8, lachrymal bone ; 9, nasal bone ; 10, inferior maxillary (lower jaw) bone 
 
 Classification of the Bones. For convenience, the 
 bones of the skeleton are considered in three divi- 
 sions : the head, the trunk, and the limbs. 
 
 1. The Head. THE BONES OF THE SKULL AND FACE 
 form a cavity for the brain. None moves except the 
 lower jaw, which is hinged at the back. 
 
 Experiment. Try in how many different directions you can move 
 your jaw, and find what muscles you use. 
 
 THE SKULL-BONES are composed of two compact 
 plates, with a spongy layer between. These are in 
 several pieces, the outer ones being joined by notched 
 edges (sutures, sut'yurs) in a way carpenters term 
 dove-tailing. 
 
THE TRUNK. 
 
 15 
 
 Fig. U. 
 
 The skull is, in fact, a strong bone-box which shel- 
 ters the brain an organ so delicate that, if unpro- 
 tected, an ordinary blow would destroy it. Its egg 
 shape adapts it to resist pressure. 
 The smaller and stronger end is in 
 front, where the danger is greatest. 
 Projections before and behind shield 
 the less protected parts. The hard 
 plates resist, and the spongy packing 
 deadens, every blow. The dove-tailed 
 joinings disperse jars and prevent 
 fractures from spreading, while the 
 frequent openings afford safe pas- 
 sage for nerves and blood-vessels to 
 the other parts of the body. 
 
 2. The Trunk. THE TRUNK has two 
 important cavities. The upper part, 
 or chest, contains the heart and the 
 lungs, and the lower part, or abdomen, 
 holds the stomach, liver, kidneys, and 
 other organs (Fig. 27). The principal 
 bones are those of the spine, the ribs, 
 and the hips. 
 
 THE SPINE consists of twenty-four 
 les (vertebra), between which are 
 placed pads of cartilage. Within the 
 column is a canal for the spinal cord. 
 Strong projections at the back and 
 on either side are abundant for the 
 attachment of the muscles. The 
 packing acts as a cushion to prevent the jar from 
 reaching the brain when we jump or run while the 
 double curve disperses the force of a fall. 
 
16 THE SKELETON. 
 
 THE PERFECTION OF THE SPINE surpasses all human 
 contrivances. A chain of twenty-four bones is at 
 once so stiff that it will bear a heavy burden, and so 
 flexible that it will bend like rubber. Resting upon it, 
 the brain is borne without a tremor ; clinging to it, the 
 vital organs are carried without fear of harm ; and, 
 snugly hidden within it, lies a delicate nerve that 
 would thrill with the slightest touch. 
 
 A 
 
 B, the first cervical vertebra, the atlas ; A, the atlas, and the second cervical vertebra 
 the axis ; e, the odontoid process ; c, the foramen. 
 
 THE JOINT BETWEEN THE SKULL AND THE SPINE is 
 A VERY PECULIAR ONE. On the top of the upper 
 vertebra (atlas) are two little hollows (a, b, Fig. 5), 
 into which fit the corresponding projections on the 
 lower part of the skull, and thus the head can rock 
 to and fro. The second vertebra (axis) has a peg, e, 
 which projects through a hole, c, in the first. Thus, 
 when we move the head side wise, the atlas turns 
 round the peg of the axis. 
 
 THE BIBS, also twenty-four in number, are ar- 
 ranged in pairs on each side of the chest. At the 
 back, they are all attached to the spine. In front, 
 the upper seven pairs are tied by cartilages to the 
 breast-bone ; three are fastened to each other and 
 
THE TRUNK. 17 
 
 the cartilage above, and two, the floating ribs, are 
 loose. 
 
 If the chest-wall were a single, thick bone, it 
 would be heavy, and unwieldy. As it is, the long, 
 
 The Thorax, or Chest: a, the sternum, or breast-bone; b to c, the true ribs: d 
 to h, the false ribs ; g, h, the floating ribs ; i k, the dorsal vertebrae.. 
 
 slender ribs, the arched form, and the connecting 
 cartilages furnish lightness, strength, and elasticity, 
 just what we need to breathe easily, and, at the 
 same time, to protect the delicate organs within. 
 The natural chest is smaller at the top than at the 
 bottom, but our tight clothing often reverses this 
 shape. 
 
 THE HIP-BONES form a kind of basin (pelvis). In 
 the upper part, is the foot of the spinal column a 
 wedge-shaped bone firmly planted between the solid 
 
18 
 
 THE SKELETON. 
 
 bones of the hip, like the keystone to an arch, a 
 steady support to the heavy burden above. 
 
 Fig. 7. 
 
 The Pelvis (a basin) ; a, the sacrum (sacred) ; b, b, the right and left innominata, cr 
 
 Fig. 8. 
 
 3. The Limbs. Two SETS OF LIMBS branch from 
 the trunk, viz. : the upper, and 
 the lower. They closely resem- 
 ble each other. The arm cor- 
 responds to the thigh ; the 
 fore-arm, to the leg ; the wrist, 
 to the ankle ; the fingers, to the 
 toes. 
 
 1. THE UPPER LIMBS. The 
 Shoulder. The bones of the 
 shoulder are the collar-bone 
 (clavicle), and the shoulder- 
 blade (scapula). 
 
 The clavicle is a long, slen- 
 der bone, shaped like the Italic 
 
 The Shoulder-joint : a, the clav- / T j. .< j. ' j j. -ij. 
 
 icie ; b, the scapula. / J-t is fastened, at one end to 
 
THE LIMBS. 
 
 19 
 
 Fig. 9. 
 
 the breast-bone and the first rib, and, at the other, 
 to the shoulder-blade. It thus holds the shoulder- 
 joint out from the chest, and gives the arm greater 
 play. 
 
 The Shoulder-blade is a thin, flat, triangular bone, 
 fitted to the top and back of the chest, making a 
 foundation for the muscles of the shoulder. 
 
 The Shoulder-joint. The arm-bone, or humerus, 
 is attached to the shoulder-blade by a ball-and-socket 
 joint. This consists of a cup-like cavity in the latter 
 bone, and a rounded head in the former to fit it, 
 thus allowing a free rotary motion. The shallow 
 socket causes a frequent dis- 
 location of this joint, but a 
 deep one would spoil the easy 
 swing of the arm. 
 
 The Elbow. At the elbow, 
 the humerus is attached to 
 the ulna a slender bone on 
 the inner side of the fore-arm 
 by a hinge- joint which ad- 
 mits of motion only backward 
 and forward. The head of the 
 radius, or large bone of the 
 fore-arm, is convex at the 
 elbow, and fits into a shallow 
 cavity in the ulna, while at 
 the wrist the ulna plays in a 
 similar socket in the radius. 
 Thus the radius may roll over 
 
 the ulna. Bones of right Fwe-arm; B.,tM 
 
 rm, Trr - j. 4. humenis ; R, the radius; U, Ot* 
 
 The Wrist consists of two u ina. 
 
THE SKELETON. 
 
 Fig. 10. 
 
 rows of irregular bones, one of which is attached to 
 the fore-arm; the other, to the hand. They are 
 placed side to side and so firmly fastened as to admit 
 of only a gliding motion. This gives little play, but 
 great strength, elasticity, and power of resisting 
 shocks. 
 
 The Hand. The bones of the palm support each a 
 thumb or finger. Each finger has three bones, but 
 
 the thumb has only two. 
 The first bone of the thumb, 
 standing apart from the 
 rest, enjoys a special free- 
 dom of motion, and adds 
 greatly to the usefulness of 
 the hand. 
 
 The first bone of each 
 finger is so attached to the 
 corresponding bone of the 
 palm as to move in several 
 directions upon it, but the 
 others have simple hinge - 
 joints. 
 
 The fingers are named in 
 order : the thumb, the in- 
 dex, the middle, the ring, 
 
 and the little finger. Their different lengths cause 
 them to fit the hollow of the hand when it is closed, 
 and probably enable us more easily to grasp objects 
 of varying size. 
 
 Bones of the Hand and the Wrist. 
 
 Experiment. If you clasp a ball with your hand, the tips of your 
 fingers will form a straight line. 
 
The Hip-joint. 
 
 2. THE LOWER LIMBS. The Hip. The thigh-bone, 
 or femur, which, at every step, has to bear our 
 weight, is the largest and strongest in the skeleton. 
 It is attached to the hip-bone by a ball-and-socket 
 joint. Unlike the shoulder- joint, the cup here is 
 deep, thus affording less play, but greater strength. 
 
 The Knee is strengthened by the knee-pan (patella, 
 little dish), a chestnut-shaped bone firmly fastened 
 over the joint. 
 
 The shin-bone (tibia), the large, triangular bone 
 on the inner side of the leg, is attached to both the 
 femur and the foot by a hinge- joint. The knee-joint 
 admits of a slight rotary motion when the limb is 
 not extended. 
 
 The fibula (fibula, a clasp), the small, outside bone 
 of the leg, is strongly bound at both ends to the tibia 
 
22 THE SKELETON. 
 
 (Fig. 1). It is immovable, and, as the tibia bears the 
 principal weight of the body, the chief use of this 
 second bone seems to be to give more surface to 
 which the muscles may be attached. 
 
 The Foot. The graceful arch of the foot, and the 
 numerous bones joined by cartilages (Fig. 1), give an 
 elasticity to the step that could never be attained by 
 a single, flat bone. The toes naturally lie straight 
 forward in the line of the foot. Few persons in civ- 
 ilized nations, however, have naturally-formed feet. 
 The big toe is crowded upon the others, while crossed 
 toes, in-growing nails, corns, and bunions abound. 
 
 The cause of these deformities is found in the shape 
 and size of fashionable boots and shoes. Narrow 
 points pinch our toes, and compel them to override 
 one another ; narrow soles compress the arch ; while 
 high heels, by throwing all the weight forward on 
 the toes, strain and enlarge the ankle. 
 
 When we are measured for boots or shoes, we 
 should stand on a sheet of paper, and have the shoe- 
 maker mark with a pencil the exact outline of our 
 feet as they bear our whole weight. When the shoe 
 is made, the sole should exactly cover this outline, 
 while the heels should be low, flat, and broad. 
 
 Diseases. 1. THE RICKETS are caused by a lack of mineral matter 
 in the bones, rendering them soft and pliable, so that they bend under the 
 weight of the body. The disease is cured by a more nutritious diet, or by 
 taking phosphate of lime to supply the lack. 
 
 2. BOWLEGS are produced by children standing on their feet before the 
 bones of the lower limbs are strong enough to bear their weight. A young 
 child should never be urged to stand. Nature will set him on his feet 
 when the proper time comes. 
 
PRACTICAL QUESTIONS. 23 
 
 3. CURVATURE OF THE SPINE. When the spine is bent, the packing 
 between the vertebrae becomes compressed on one side into a wedge-like shape. 
 After a time, it will lose its elasticity, and the spine become distorted. This 
 occurs in the case of students who bend forward to bring their eyes nearer 
 their books, instead of lifting their books nearer their eyes, or who raise 
 their right shoulder above their left when writing at a desk which is too 
 high. Round shoulders, small, weak lungs, and, oftentimes, diseases of 
 the spine are the consequences. An erect posture in reading or writing 
 conduces not alone to beauty of form, but also to health of body. 
 
 4. SPRAINS are produced when the ligaments which bind the bones of 
 a joint are strained, twisted, or torn from their attachments. They are 
 quite as harmful as a broken bone, and require careful attention, lest they 
 lead to a crippling for life. The use of a sprained limb may permanently 
 impair its strength. 
 
 5. A DISLOCATION is produced by the rupture of the tissues of the joint 
 so that the head of the bone is driven out of its socket and into some other 
 place both by the force of the blow which caused the injury and by the 
 contraction of the muscles. 
 
 PRACTICAL QUESTIONS. 
 
 1. Why does not a fall hurt a child as much as it does a grown person ? 
 
 2. Should a young child ever be urged to stand or walk ? 
 
 3. What is meant by "breaking one's neck " ? 
 
 4. Should chairs or benches have straight backs ? 
 
 5. Should a child's feet be allowed to dangle from a high seat ? 
 
 6. Why can we tell whether a fowl is young by pressing on the point oi 
 the breast-bone ? 
 
 7. What is the use of the marrow in the bones ? 
 
 8. Why is the shoulder so often put out of joint ? 
 
 9. How can you tie a knot in a bone ? 
 
 10. Why are high pillows injurious ? 
 
 11. Why should we not wear narrow-toed shoes ? 
 
 12. Should a boot have a heel-piece ? 
 
THE SKELETON. 
 
 13. Why should one always sit and walk erect ? 
 
 14. Why does a young child creep rather than walk ? 
 
 15. What is the natural direction of the big toe ? 
 
 OF THE 
 
 Frontal Bone (forehead). 
 Two Parietal bones. 
 
 1 CRANIUM ' Two Tem P oral (temple) bones. 
 
 1. URANIUM -, Sphenoid bone. 
 
 I Ethmoid (sieve-like bone at root of nose). 
 (_ Occipital bone (back and base of skull). 
 
 ( Two Superior Maxillary (upper jaw) bones. 
 O I Inferior Maxillary (lower jaw) bone. 
 
 ^ ^ Two Malar (cheek) bones. 
 
 H I | Two Lachrymal bones. 
 
 J ' ii FACE < Two Turbinated (scroll-like) bones, each side 
 
 (Ik bones). of nose. 
 
 5 *, Two Nasal bones (bridge of nose). 
 
 1 Vomer (the bone between the nostrils). 
 Two Palate bones. 
 
 : f Hammer. 
 
 3. EARS - Anvil. 
 
 I (6 bones). ( Stirrup. 
 
 ( Cervical Vertebrae (seven vertebrae of the neck). 
 1. SPINAL COLUMN. < Dorsal Vertebrae (twelve vertebrae of the back). 
 ( Lumbar Vertebrae (five vertebrae of the loins). 
 
 P ^ 9 -R,, <i True Eibs. 
 
 g g 2 ' RIBS I False Ribs. 
 
 i-l 2 -i & STERNUM (breast-bone). 
 
 4. Os HYOIDES (bone at the root of tongue). 
 03 
 
 ( Two Innominata. 
 
 5. PELVIS < Sacrum. 
 
 ( Coccyx. 
 
 E-i 
 
 {Arm -! l?i UmerU H--P 
 ) Ulna and Radius. 
 ( Eight Wrist or Carpal bones. 
 Hand < Five Metacarpal bones. 
 
 ( Phalanges (14 bones). 
 
 S( Femur. 
 (Leg -{Patella. 
 
 ( Tibia and Fibula. 
 H 2. LOWER LIMBS ...-< 
 
 (60 bones.) ( Seven Tareal bones. 
 
 V, Foot < Five Metatarsal bones. 
 
 ( Phalanges (14 bones.) 
 
THE MUSCLES. 
 
 rpHE Use of the Muscles. The skeleton is the 
 -L image of death. Its unsightly appearance in- 
 stinctively repels us. We have seen, however, what 
 uses it subserves in the body, and how the ugly- 
 looking bones abound in nice contrivances and inge- 
 nious workmanship. In life, the framework is hidden 
 by the flesh. This covering is a mass of muscles, 
 which not only give form and symmetry to the body, 
 but also produce its varied movements. 
 
 Contractility. The peculiar property of the muscles 
 is their power of contraction. It does not cease at 
 death, but, in certain cold-blooded animals, is often 
 noticed long after the head has been cut off. 
 
 Arrangement of the Muscles. The muscles are 
 nearly all arranged in pairs, each with its antag- 
 onist, so that, as they contract and expand alter- 
 nately, the bone to which they are attached is moved 
 to and fro. 
 
 Experiments. Grasp your arm tightly with your hand just above 
 the elbow-joint, and bend the fore-arm. You will feel the inside muscle 
 (biceps) swell and become hard and prominent, while the outside muscle 
 (triceps) will relax. Now straighten the arm, and the swelling and hard- 
 ness of the inside muscle will vanish, while the outside one will become 
 rigid. 2. Clasp the arm just below the elbow, and then open and shut the 
 fingers. You will feel the alternate expanding and relaxing of the muscles 
 
26 THE MUSCLES. 
 
 on opposite sides of the arms. 3. Place your hand on your temple, and 
 chew. You will feel the contraction of one of the muscles that work the 
 lower jaw. 
 
 Kinds of Muscles. There are two kinds of mus- 
 cles, the voluntary, which are under the control of 
 our will, and the involuntary, which are not. Thus 
 our limbs stiffen or relax as we please, but the heart 
 beats on by day and by night. The eyelid, however, 
 is both voluntary and involuntary, so that while we 
 wink unconsciously, we can also control the motion. 
 
 Structure of the Muscles. Each muscle is com- 
 posed of a multitude of tiny fibers. 
 
 Experiments. 1. Wash out the red color from a piece of lean beef. 
 You can easily detect the fine fibers of which the meat is composed. In 
 boiling corned beef, the fibers often separate, owing to the dissolving of the 
 delicate tissue which bound them together. 2. Place a fiber under a micro- 
 scope. You will find it made up of minute filaments (fibrils], each fibril 
 composed of a row of tiny cells arranged like a string of beads. 
 
 Fig. 18. 
 
 Microscopic view of a Muscle, showing, at one end, thefibrillce ; and, at the other, 
 the disks, or cells, of the fiber. 
 
 The binding of so many threads into one bundle 
 confers great strength. We see this illustrated in 
 suspension bridges, where the weight is sustained by 
 small wires twisted into massive ropes. 
 
 The Tendons. The ends of the muscles are gen- 
 
THE TENDONS. 
 
 27 
 
 erally attached to the bone by strong, flexible, but 
 inelastic tendons. 
 
 Experiment. Compare the muscles and tendons in the roasted leg 
 of a fowl. 
 
 The muscular fibers spring from the sides of the 
 tendon, so that more of them 
 can act upon the bone than if 
 they went directly to it. Be- 
 sides, the small, insensible ten- 
 don can better bear the expos- 
 ure of passing over a joint, and 
 be more easily lodged in some 
 protecting groove, than the 
 broad, sensitive muscle. This 
 mode of attachment gives to 
 the limbs strength, and ele- 
 gance of form. Thus, for ex- 
 ample, if the large muscles of 
 the arm extended to the hand, 
 they would make it bulky and 
 clumsy. Even the tendons, at 
 the wrist, become fine cords 
 that pass to the fingers. 
 
 Here we notice two other 
 admirable arrangements. 1. 
 If the long tendons at the 
 wrist on contracting should 
 rise, projections would be made 
 and thus the beauty of the 
 joint be marred. To prevent this, a stout band or 
 bracelet of ligament holds them down to their place. 
 
 Tendons of the Hand. 
 
28 THE MUSCLES. 
 
 2. In order to allow the tendon which moves the 
 last joint of the finger to pass through, the tendon 
 which moves the second joint divides at its attach- 
 ment to the bone. This is the most economical mode 
 of packing the muscles so as not to increase the size 
 of the slender finger. 
 
 Fig. 15. 
 
 The Muscles of the Right Eye. A, superior straight : B, superior oblique passing 
 through a pulley, D ; G, inferior oblique ; H, external straight , and, back of it, the 
 internal straight muscle. 
 
 Since the tendon cannot always pull in the direc- 
 tion of the desired motion, some contrivance is 
 necessary to meet the want. The tendon (B) belong- 
 ing to one of the muscles of the eye, for example, 
 passes through a ring of cartilage (D), and thus a 
 rotary motion is secured. 
 
 The Enlargement of the Bones at the Joints not 
 only gives more surface for the attachment of the 
 
HOW WE STAND ERECT. 
 
 Fig. 16. 
 
 muscles, but it enables them to work to 
 better advantage. Thus, in Fig. 16, a 
 muscle acting in the line fb would not 
 bend the lower limb so easily as if acting 
 in the line fh, since in the one case its 
 force would be about all spent in draw- 
 ing the bones more closely together, 
 while in the other it would pull more 
 nearly at a right angle. Thus the ten- 
 
 The Knee-joint 
 h, the patella ,' 
 f, the tendon. 
 
 don /, by passing over the 
 patella, which is itself pushed 
 out by the protuberance b of the thigh- 
 bone, pulls at a larger angle, and so the 
 leg is thrown forward with ease in walk- 
 ing and with great force in kicking. 
 
 How We Stand Erect. It requires the 
 action of many muscles to hold our 
 bodies upright. The head so rests upon 
 the spine as to tend to fall in front, but 
 the muscles of the neck steady it in its 
 place. The hips incline forward, but 
 are held erect by the strong muscles of 
 the back. The trunk is nicely balanced 
 on the head of the thigh-bones. The 
 great muscles of the thigh acting over 
 the knee-pan tend to bend the body for- 
 ward, but the muscles of the calf oppose 
 this action. The ankle, the knee, and 
 the hip lie in nearly the same line, and 
 thus the weight of the body rests directly 
 on the key-stone of the arch of the foot. 
 So perfectly do these muscles act that we 
 
 Fig. 17. 
 
 Action of the 
 Muscles which 
 keep the body 
 erect. 
 
30 THE MUSCLES. 
 
 never notice them, and yet to learn how to use them 
 in our infancy needed patient lessons, much time, 
 and many hard knocks. 
 
 How We Walk. Walking is really a perilous act, 
 which has become safe only because of constant 
 practice. Standing on one foot, we let the body fall 
 forward, and swing the other leg ahead like a pen- 
 dulum. Planting that foot on the ground, to save 
 the body from failing further, we swing the first foot 
 forward again to repeat the same operation. In 
 walking, therefore, we have always one foot, and 
 sometimes both feet on the ground. In running, we 
 incline the body more, and so, as it were, fall faster, 
 and there is an instant in each step when both feet 
 are off the ground. We are shorter when walking 
 or running than when standing still, because of this 
 falling forward to take a step in advance. 
 
 Experiment. Stand a boy erect against a wall. Mark his height 
 with a stick. Now have him step off a part of a pace, and then several 
 whole paces. Next, let him close his eyes, and walk to the wall again. He 
 will be perceptibly lower than the stick, until he straightens up once more 
 from a walking position. 
 
 The Muscular Sense. When we lift an object, we 
 feel a sensation of weight, which we can compare 
 by lifting another object. We can cultivate this 
 sense till we can estimate the weight of a body by 
 simply balancing it on the palm of the right hand, 
 that being generally more accurate than the left. 
 Some parts of the body are more sensitive than 
 others to differences in weight. 
 
 Experiment. Roll a small ivory ball down your cheek toward your 
 lips, and it will appear to increase in weight. 
 
EXERCISE. 31 
 
 We gratify the muscular sense when we walk erect 
 and with an elastic step, and by dancing, jumping, 
 skating, and gymnastic exercises. 
 
 Necessity of Exercise. By use, the muscles grow 
 larger, and become hard, compact, and darker- 
 colored ; by disuse, they decrease in size, and become 
 soft, flabby, and pale. Exercise also sets every 
 organ in the body at work. The lungs, skin, and 
 kidneys the scavengers of the body hasten to re- 
 move waste matter, and a healthful glow succeeds. 
 
 Violent Exercise, however, is injurious, since we 
 then tear down faster than nature can build up. 
 Feats of strength are not only hurtful, but dangerous. 
 Often the muscles are strained or ruptured, and 
 blood-vessels burst in the effort to outdo one's com- 
 panions. Even so simple an amusement as jumping 
 the rope, carried to excess, has been known to cause 
 sudden death. 
 
 Time for Exercise. Do not exercise when very 
 hungry, nor immediately after a full meal. Only 
 the strong and healthy should exercise before break- 
 fast, as in early morning the pulse is low, the skin 
 relaxed, and the system susceptible to cold. Weak 
 and delicate persons, therefore, need to be braced 
 with food before they brave the out-door air. 
 
 Kind of Exercise. For children, the out-door 
 games are unequaled. Walking in the open air and 
 sunlight is always healthful. Running is better, 
 since it employs more muscles, but it must not be 
 pushed to excess, as it taxes the heart. Rowing 
 develops the whole system. Swimming, also, em- 
 ploys all the muscles, and is a valuable acquirement, 
 
32 THE MUSCLES. 
 
 as it may be the means of saving life. Horseback 
 riding is a fine accomplishment, and refreshes mind 
 and body alike. Gymnastic or calisthenic movements, 
 judiciously used, furnish the best in-door exercise. 
 
 The Law of Health is to take daily, moderate out- 
 door exercise, avoiding extreme fatigue. It is bad 
 policy to stimulate the brain at the expense of the 
 muscles, and recesses should be as sacred to play as 
 study-hours are to work. 
 
 The Wonders of the Muscles. The grace, ease, 
 and rapidity with which the muscles contract are 
 astonishing. The voice may utter 1,500 letters in a 
 minute, yet each requires a distinct position of the 
 vocal organs. We train the muscles of the fingers 
 till they glide over the keys of the piano, executing 
 the most exquisite and difficult harmony. In writing, 
 each letter is formed by its peculiar motions, yet we 
 make them so unconsciously that a skilful penman 
 will describe beautiful curves while thinking only of 
 the idea that the sentence is to express. The mind 
 of the violinist is upon the music which his right 
 hand is executing, while his left determines the 
 length of the string and the character of each note 
 so carefully that not a false sound is heard, although 
 the variation of a hair's breadth would cause a dis- 
 cord. In the arm of a blacksmith, the biceps muscle 
 may grow into the solidity almost of a club ; the 
 hand of a prize-fighter will strike a blow like a 
 sledge-hammer : while the engraver traces lines 
 invisible to the naked eye, and the fingers of the 
 blind acquire a delicacy that almost supplies the 
 place of the missing sense. 
 
DISEASES. 33 
 
 Diseases. 1. ST. Virus's DANCE is a disease of the voluntary 
 muscles, whereby they are in frequent, irregular, and spasmodic motion 
 beyond the control of the will. It is closely connected with a derange- 
 ment of the nervous system, and hence the patient should be kept from ex- 
 citement, and his general health invigorated. 
 
 2. LOCKED-JAW is marked by spasms and a contraction of the muscles, 
 usually beginning in the lower jaw. It is serious, often fatal, yet may be 
 caused by as trivial an injury as the stroke of a whip-lash, the lodgment 
 of a bone in the throat, a fish-hook in the finger, or a prick in the foot by 
 a tack. 
 
 3. GOUT is an acute pain located chiefly in the small joints of the foot, 
 especially those of the great toe, which swell and become extremely sensi- 
 tive. It is generally brought on by high living. 
 
 4. RHEUMATISM affects mainly the connective, white, fibrous tissue of the 
 larger joints. There are two common forms the inflammatory or acute, 
 and the chronic. The acute form is probably a disease of the blood, which 
 carries with it some poisonous matter that is deposited where the fibrous 
 tissue is most abundant. The pain is extreme, the disease flies from one 
 joint to another, and there is always danger that it may go to the heart. 
 All violent remedies, therefore, are to be avoided. Repeated acute attacks 
 lead to the chronic form, and make the patient a life-long sufferer. 
 
 PRACTICAL QUESTIONS. 
 
 1. Describe the motions of the bones when we are using a gimlet. 
 
 2. Why do we tire when we stand erect ? 
 
 3. Why does it rest us to change our work ? 
 
 4. Why and when is dancing a beneficial exercise ? 
 
 5. Why do we lean forward when we wish to rise from a chair ? 
 
 6. Why does the projection of the heel-bone make walking easier ? 
 
 7. Does a horse travel with less fatigue over a flat than a hilly country? 
 
 8. Can you move your upper jaw? 
 
 9. Are people naturally right or left handed ? 
 
 10. Why can so few persons move their ears by the muscles ? 
 
 11. Is the blacksmith's right arm healthier than the left ? 
 
34 THE MUSCLES. 
 
 12. Boys often, though foolishly, thrust a pin into the flesh just above 
 the knee. Why is it not painful ? 
 
 13. Will ten-minutes practice in a gymnasium answer for a day's 
 exercise ? 
 
 14. Why would an elastic tendon be unfitted to transmit the motion of 
 a muscle ? 
 
 15. When one is struck violently on the head, why does he instantly 
 fall? 
 
 16. What is the cause of the difference between light and dark meat in 
 a fowl ? 
 
 BLA.CK BO AR, L> ANALYSIS. 
 
 f 1. The use of the muscles. 
 I 2. Contractility of the muscles. 
 
 13. Arrangement of the muscles. 
 4. The two kinds of muscles. 
 5. The structure of the muscles. 
 MUSCLES. I 6. The tendons for fastening muscles. 
 
 7. The effect of big joints. 
 
 8. Action of the muscles in standing. 
 
 9. Action of the muscles in walking. 
 
 2. THE MUSCULAR SENSE. 
 
 1. Necessity of Exercise. 
 
 2. Violent Exercise 
 
 3. HYGIENE OF THE I 3 Time for Exerc i se . 
 
 I 4. Kinds of Exercise. 
 5. Law of Health. 
 
 4. WONDERS OF THE MUSCLES. 
 
 5. DISEASES. 
 
 1. St. Vitus's Dance. 
 
 2. Locked-jaw. 
 
 3. Gout. 
 
 4. Rheumatism. 
 
THE SKIN. 
 
 rTlHE Skin is a tough, thin, close-fitting, elastic 
 -A- garment which protects the tender flesh. It is, 
 also, an active organ, doing its part to keep in order 
 the house in which we live. It oils itself to preserve 
 its smoothness and delicacy, replaces itself as fast 
 as it wears out, and is at once the perfection of use 
 and beauty. 
 
 Cutis and Cuticle. What we commonly call the 
 skin viz., the part raised by a blister is only the 
 cuticle, which covers the cutis or true skin. The 
 
 A represents a vertical section of the cuticle; B, lateral tie w of the cells ; C,Jlat 
 side of scales like d, magnified 250 diameters, showing the nucleated cells transformed 
 into broad scales. 
 
 cutis is full of nerves and blood-vessels, but the 
 cuticle neither bleeds nor causes pain, neither suffers 
 from heat nor feels the cold. 
 
36 THE SKIN. 
 
 Experiment. Run a needle through the thick cuticle at the root of 
 your finger-nail, and note its insensibility. 
 
 The cuticle is composed of small, flat cells or 
 scales. These are constantly shed from the surface 
 in the form of scurf, dandruff, etc., but are as con- 
 stantly renewed from the cutis below. 
 
 Value of the Cuticle. In the palm of the hand, 
 the sole of the foot, and other parts especially liable 
 to injury, the cuticle is very thick. This is an ad- 
 mirable provision for their protection. By use, it 
 becomes callous and horny. The boy who goes out 
 barefoot for the first time, "treading as if on eggs," 
 can soon run where he pleases among thistles and 
 over stones. So the blacksmith handles hot iron, 
 and the mason works in lime, without burning or 
 corroding their flesh. 
 
 The Complexion. In the freshly-made cells on 
 the lower side of the cuticle, is a pigment composed 
 of tiny grains. In its varying tint lies the difference 
 of hue between the blonde and the brunette, the 
 European and the African. The sun has a powerful 
 effect upon the coloring-matter, and so we " tan " on 
 exposure to its rays. If the color gathers in spots, it 
 forms freckles. 
 
 HAIR AND NAILS. 
 
 The Hair and the Nails are modified forms of the 
 cuticle. 
 
 The Hair protects from heat and cold, and shields 
 the head from blows. 
 
THE HAIR. 
 
 hair marjmjied 600 
 diameters. S, the sac (fol- 
 P, the papula, 
 the cells and the 
 blood-vessels (V). 
 
 Experiment. Place a hair on the slide of 
 a microscope, cover it with a thin glass, and let a 
 few drops of alcohol flow between the cover and 
 the slide. (This causes the air, which tills the 
 hair and prevents our seeing its structure, to 
 escape. ) You will see that the outside of the hair 
 is hard and compact, and consists of a layer of 
 colorless scales, which overlie one another like the 
 shingles of a house. The interior is porous, and 
 probably conveys the liquids by which it is nour- 
 ished. 
 
 Each hair grows from a tiny 
 bulb (papilla), at the bottom of a 
 little hollow in the skin, being pro- 
 duced, like the cuticle, by the con- 
 stant formation of new cells at its base. The hair 
 itself is insensible, and the pain felt when one is 
 pulled out comes from nerves in the hollow wherein 
 it is rooted. If the bulb has been uninjured in the 
 pulling, it will produce a new hair; but, the bulb 
 destroyed, the hair will never grow again. Gray 
 hair cannot be restored to its original color. Hair- 
 dyes and so-called " hair-restorers" are usually in- 
 jurious substances, containing lead or lunar caustic. 
 
 Wherever hair exists, are found tiny muscles, 
 which contract when exposed to cold, pucker up the 
 skin, and so cause the hair to stand on end. This 
 muscular tissue is still more fully developed in 
 horses and other animals, which we see shaking the 
 whole skin, in order to drive away flies. 
 
 The Nails protect the ends of the tender finger, 
 and toe, and give us more power to grasp and pick 
 up objects. By their aid, we perform a hundred 
 
THE SKIN. 
 
 little mechanical acts which 
 else were impossible. Their 
 delicate color and beautiful 
 outline give a finish of orna- 
 ment to the hand. The nail is 
 set in a groove in the cuticle, 
 
 c and grows at the root in 
 length, and from beneath in 
 
 D thickness. 
 
 Experiment. Make a little mark 
 
 T^ 
 
 near the root of a nail. You can see, week 
 by week, how the process of growth goes on, 
 and form some idea of what a multitude 
 of cells must be transformed into horny 
 matter. 
 
 THE MUCOUS MEMBRANE. 
 
 Structure. At the edges of 
 the openings into the body, the 
 skin seems to stop, giving place 
 to a ^dder, more sensitive 
 tissue, moistened by a fluid 
 (mucus). Really, however, the 
 
 skin does not cease, but passes into a more delicate 
 covering of the same general composition, viz., an 
 outer, hard, bloodless, insensible layer, and an inner, 
 soft, nervous one. 
 
 Connective Tissue. The cutis and the correspond- 
 ing layer of the mucous membrane consist chiefly 
 of a fibrous substance, called connective tissue be- 
 cause it connects all the differenl parts of the body. 
 In the mucous membrane it is soft and tender, but 
 
USES OF MEMBRANE. 39 
 
 in the ligaments and tendons it is strong and dense. 
 It yields gelatine on boiling, and is the part which 
 tans when hides are manufactured into leather. 
 
 Experiment. Note in a piece of veal this delicate substance between 
 the layers of muscle, binding together their numerous fibers. If you blow 
 air into the veal, it will fill the tiny cells of the tissue and make the meat 
 look plump a trick not unknown, it is said, to butchers. 
 
 Uses of Membrane. Our bodies are wrapped in 
 membrane. On the outside, the skin protects from 
 exterior injury, and, on the inside, the mucous 
 membrane reaches from the lips to the innermost 
 air-cell of the lungs. Every organ is enveloped. 
 Every bone has its sheath. Every socket is lined. 
 Even the separate fibers of muscles are covered with 
 tissue. The brain and the spinal cord are triply 
 wrapped, while the eye is only a membranous globe 
 filled with fluid. These membranes not only protect 
 and support the organs they enfold, but they also 
 perform an important function. " They are the fil- 
 ters of the body." Through their pores pass alike the 
 elements of growth, and the returning products of 
 waste. Bathed on one side by the blood, they choose 
 from it suitable food for the organ they envelop, 
 and, in their tiny, mysterious cells, even form new 
 products, just suited to the needs of the body. 
 
 Fat is deposited as an oil in the cells of this tissue, 
 just beneath the skin, giving plumpness to the body, 
 and acting as a non-conductor to retain the heat. 
 It collects as pads in the hollows of the bones, around 
 the joints, and between the muscles, causing them 
 to glide more easily upon each other. As marrow, 
 
40 THE SKIN. 
 
 it nourishes the skeleton, and also distributes the 
 shock of a sudden jar. It does not, however, gather 
 within the lungs, or the eyelids, where it would clog 
 the organs. 
 
 THE TEETH. 
 
 The Teeth are thirty-two in all, there being eight 
 in each half -jaw, similarly shaped and arranged. 
 In each set of eight, the two nearest the middle of 
 the jaw have wide, sharp, chisel-like edges, fit for 
 cutting, and hence are called incisors. The next 
 corresponds to the great tearing or holding tooth 
 of the dog, and is styled the canine, or eye-tooth. 
 The next two have broader crowns, with two points, 
 or cusps, and are hence termed the bicuspids. The 
 remaining three are much broader, and, as they are 
 ue?,d to crush the food, are called the grinders, or 
 molars. The incisors and eye-teeth have one fang, 
 or root,the others have two or three each. 
 
 The Milk-teeth. We are given two sets of teeth. 
 
 Fig. tl. 
 
 The teeth a the age of six and one-half years. I, the incisors ; Q,the canine ; M, 
 the molars : the last molar is the first of the permanent teeth ; F, sacs of the permanent 
 incisors ; C, of the canine ; B, of the bicuspids ; N, of the 2d molar ; the sac of the 3d 
 molar is empty. MARSHALL. 
 
Fig. 
 
 41 
 
 The first, ^r iMlK-teeth, are small and only twenty 
 in number. Each half -jaw has two incisors, one 
 canine, and two molars. The middle incisors are 
 usually cut about the age of seven months, the 
 others at nine months, the first molars at twelve 
 months, the canines at eighteen months, and the 
 remaining molars at two or three years of age. The 
 lower teeth precede the corresponding upper ones. 
 The time often varies, but the order seldom. 
 
 The Permanent Teeth. At six years, when the 
 first set is usually still perfect, the jaws contain the 
 crowns of all the second, except the wisdom-teeth. 
 About this age, to meet the wants of the growing 
 body, the crowns of the perma- 
 nent set begin to press against 
 the roots of the milk-teeth, which, 
 becoming absorbed, leave the 
 loosened teeth to drop out, while 
 the new ones rise to occupy their 
 places. 
 
 The central incisors appear at 
 about seven years of age ; the 
 others at eight ; the first bicus- 
 pids at nine, the second at 
 ten ; the canines at eleven 
 or twelve ; the second molars 
 at twelve or thirteen, and 
 the last, or wisdom - teeth, 
 are sometimes delayed until the 
 twenty-second year or even later. 
 
 Structure of the Teeth. A tooth consists of (1) 
 the crown protected by a hard, white enamel; (2) 
 
 Vertical Kecfiori ofa Molar 
 &SS?<$$1 
 
 c ' c 
 
42 THE SKIN. 
 
 dentine a dense, bone-like substance ; and (3), at 
 its center, a soft, reddish- white pulp, full of nerves 
 and blood-vessels. The fang is covered by a thin 
 layer of bone (cement). The seat of toothache is 
 in the sensitive pulp. 
 
 The Decay of the Teeth is commonly caused by 
 bits of food which get between them and decom- 
 pose ; and (2) by the saliva which deposits a sedi- 
 ment called tartar. 
 
 Preservation of the Teeth. The teeth should be 
 brushed at least every morning with tepid water, 
 and twice a week with soap and powdered orris-root. 
 After each meal, every particle of food should be 
 removed from between them, using a quill or wooden 
 tooth-pick. The enamel once injured, it is never 
 restored, and the tooth will soon decay. We should 
 not, therefore, crack nuts, bite thread, or use metal 
 tooth-picks, gritty tooth-powder, or any acid which 
 "sets the teeth on edge," i. e., that acts upon the 
 enamel. It is well to have the teeth examined 
 yearly by a dentist. 
 
 THE GLANDS OF THE SKIN. 
 
 I. The Oil Glands are clusters of tiny sacs which 
 secrete an oil that flows to the root of the hair, 
 thence oozing out on the cuticle (Fig. 20). This is 
 nature's hair-dressing, and it also keeps the skin soft 
 and flexible. These glands are of considerable size 
 on the face, especially about the nose. When ob- 
 structed, their contents become hard and dark- 
 colored, and are vulgarly called " worms." 
 
HINTS ABOUT WASHING AND BATHING. 43 
 
 II. The Perspiratory Glands are fine tubes about 
 yj~o of an inch in diameter, and a quarter of an inch 
 in length, which run through the cutis, and then 
 coil up in little balls (Fig. 20). In the palm of the 
 hand, there are about 2,800 in a single square inch. 
 The total number on the body of an adult is esti- 
 mated at about two and a half million. If they 
 were laid end to end, they would extend nearly ten 
 miles. 
 
 Experiment. Examine with a pocket lens the fine ridges on the 
 palm of your hand, and you will see the mouths (pores) of these glands. 
 
 The Perspiration. From these openings, there 
 constantly passes a vapor, forming what we call the 
 insensible perspiration. Under exercise or heat it 
 flows more freely, and condenses on the surface in 
 drops. It consists of about ninety-nine parts water, 
 and one part solid matter. The amount thrown off 
 by an adult is, on the average, about two pounds per 
 day. This constant drainage is essential to life. A 
 small animal, as the rabbit, if coated with varnish, 
 would die within twelve hours. 
 
 HYGIENE. 
 
 About Washing and Bathing. The cast-off cu- 
 ticle, dried perspiration, and dust form a crust upon 
 the skin, stopping the pores, checking the insensible 
 perspiration, and retaining in the body the waste 
 matter it ought to throw off. Hence arises the need 
 of frequent bathing. Nothing is so good for improv- 
 ing the complexion, preventing colds, keeping up 
 strength, and lengthening life. 
 
44 REACTION. 
 
 The moment of rising from bed is the proper time 
 for the full wash or bath with which one should 
 commence the day. The body is then warm, and 
 can endure cool water better than at any other time ; 
 it is relaxed, and needs bracing ; and the nerves, 
 deadened by sleep, require a gentle stimulus. If the 
 system be strong enough to resist the shock, cold 
 water is the best ; if not, use tepid. 
 
 After the bath, the whole body should be thoroughly 
 rubbed with a coarse towel or flesh-brush. At first, 
 the friction may be unpleasant, but this sensitive- 
 ness will soon pass away, and the keenest pleasure 
 be felt in the lively glow which follows. A bath 
 should not be taken just before nor immediately after 
 a meal, lest it check digestion. 
 
 Reaction. After taking a cold bath, there should 
 be a prompt reaction. When the surface is chilled 
 by cold water, the blood sets to the heart, exciting it 
 to more vigorous action ; then, being thrown back to 
 the surface, it reddens, warms, and stimulates the 
 skin. This is called the reaction, and in it lies the 
 chief virtue of a cold bath. In a hot bath, on the 
 contrary, the blood is drawn to the surface, less blood 
 goes to the heart, the circulation decreases, and 
 languor ensues. It should be followed by a dash of 
 cold water. 
 
 If, after a cold bath, we are chilly instead of warm, 
 it proves either that proper means were not taken to 
 bring on reaction, or that the circulation is not 
 vigorous enough to warrant such a bath. In general, 
 the effect of a cool bath is to exhilarate ; of a warm 
 one, to depress. Hence the latter should not ordi- 
 
CLOTHING. 45 
 
 narily be taken oftener than once a week, while the 
 former may be enjoyed daily. 
 
 Sea-Bathing is exceedingly stimulating, on account 
 of the action of the salt and the exciting sur- 
 roundings. Twenty minutes is the utmost limit for 
 bathing or swimming either in salt or fresh water. 
 A chilly sensation should be the signal for instant 
 removal. Gentle exercise after a bath is beneficial. 
 
 Clothing in winter, to keep us warm, should repel 
 the external cold and retain the heat of the body. 
 In summer, to keep us cool, it should not absorb the 
 rays of the sun, and should permit the passage of 
 the heat of the body. At all seasons, it should be 
 porous, to give ready escape to the perspiration, and 
 a free admission of air to the skin. We can readily 
 apply these essential conditions to the different kinds 
 of clothing. 
 
 Linen is soft to the touch, and is a good conductor 
 of heat. Hence it is pleasant for summer wear, but, 
 being apt to chill the surface too rapidly, it should 
 not be worn next the skin. 
 
 Cotton is a poorer conductor of heat and absorber 
 of moisture, and is therefore warmer than linen. It 
 is sufficiently cool for summer wear, and affords bet- 
 ter protection against sudden changes. 
 
 Woolen absorbs moisture slowly, and contains 
 much air in its pores. It is therefore a poor conduc- 
 tor of heat, and guards the wearer against changes in 
 weather. Hence, flannel or merino should be worn 
 next the skin at all times, except in the heat of sum- 
 mer, when cotton flannel or gauze may be substi- 
 tuted. 
 
46 INGROWING-NAILS. 
 
 Light-colored clothing is cooler in summer, and 
 warmer in winter. As the warmth of clothing de- 
 pends greatly on the amount of air contained in its 
 fibers, fine, porous cloth with a plenty of nap is best 
 for winter wear. Furs are the perfection of winter 
 clothing, since they combine warmth with lightness. 
 
 All the body except the head should be equally 
 protected by clothing. No part covered to-day can 
 be uncovered to-night or to-morrow, except at the 
 peril of health. It is a cruel fashion that leaves the 
 limbs of a little child unprotected. Nor are children 
 made more hardy by going thinly clad. The system 
 is made vigorous by exercise and food ; not by ex- 
 posure. Above all, the feet need heavy shoes with 
 thick soles, and rubbers when it is damp. At night, 
 and after exercise, we require extra clothing. 
 
 Diseases. 1. CORNS are a thickening of the cuticle, caused by pres- 
 sure or friction. They most frequently occur on the feet ; but are pro- 
 duced on the shoemaker's knee by constant hammering, and on the 
 soldier's shoulder by the rubbing of his musket. This hard portion irri- 
 tates the sensitive cutis beneath, and so causes pain. By soaking the feet 
 in hot water, the corn will be softened, when it may be paired with a sharp 
 knife. 
 
 2. IN-GROWING NAILS are caused by pressure, which forces the edge of 
 the toe-nail into the flesh. To cure them, carefully cut away the mal- 
 grown part, and then make a wedge-shaped incision in the top of the nail. 
 The two portions, uniting, will draw away the nail from the flesh at the 
 edge. To prevent them, wear broad shoes. 
 
 3. WARTS are overgrown papillse (Fig. 19). They may generally be 
 removed by applying glacial acetic acid, or a drop of nitric acid, repeated 
 until the entire wart is softened. Care must be taken to keep the acid from 
 touching the neighboring skin. The capricious character of warts has 
 given rise to the popular delusion concerning the influence of charms upcn 
 them. 
 
PRACTICAL QUESTIONS. 47 
 
 4. CHILBLAIN is a local inflammation affecting generally the feet. 
 Liability to it usually passes away with manhood. It is not caused by 
 "freezing the feet," as many suppose, though attacks are brought on, or 
 aggravated, by exposure to cold and by sudden warming. It is subject to 
 daily congestion (see Congestion), manifested by soreness, itching, etc., 
 commonly occurring at night. The best preventive is a uniform tempera- 
 ture, and careful protection against the cold by warm, loose, and plentiful 
 clothing, especially for the feet. 
 
 PRACTICAL QUESTIONS. 
 
 1. If a hair be plucked out, will it grow again ? 
 
 2. What causes the hair to "stand on end " when we are frightened ? 
 
 3. Why is the skin roughened by riding in the cold ? 
 
 4. Why is the back of a washer- woman's hand less water-soaked than 
 the palm ? 
 
 5. What would be the length of the perspiratory tubes in a single square 
 inch of the palm, if placed end to end ? 
 
 6. What colored clothing is best adapted to all seasons ? 
 
 7. What is the effect of paint and powder on the skin ? 
 
 8. Is water- proof clothing healthful for constant wear ? 
 
 9. Why are rubbers cold to the feet ? 
 
 10. Why does the heat seem oppressive when the air is moist ? 
 
 11. Why is friction of the skin invigorating after a cold bath ? 
 
 12. Why does the hair of domestic animals become roughened in winter ? 
 
 13. Why do fowls shake out their feathers erect before they perch for the 
 night ? 
 
 14. W T hy do we perspire so profusely after drinking cold water? 
 
 15. What are the best means of preventing skin-diseases, colds, and 
 rheumatism ? 
 
 16. What causes the difference between the hard hand of a blacksmith 
 and the soft hand of a woman ? 
 
 17. Why should a painter avoid getting paint on the palm of his hand ? 
 
 18. Why should we not use the soap or the soiled towel at a hotel ? 
 
 19. Which teeth cut like a pair of scissors ? 
 
 20. Which teeth cut like a chisel ? 
 
48 
 
 THE SKIN. 
 
 21. Which should be clothed the warmer, a merchant or a farmer ? 
 
 22. Why should we not crack nuts with our teeth ? 
 
 23. Do the edges of the upper and the lower teeth meet ? 
 
 24. When fatigued, would you take a cold bath ? 
 
 25. Why is the outer surface of a kid glove finer than the inner ? 
 
 26. Why will a brunette endure the sun's rays better than a blonde ? 
 
 27. Does patent-leather form a healthful covering for the feet ? 
 
 BLACKBOARD ANALYSIS. 
 
 
 
 1. The Hair 
 
 2. 
 
 THE HAIR AND THE 
 NAILS. 
 
 2. The Nails 
 
 3. 
 
 THE Mucous MEM- . 
 
 BRANE. 
 
 ' 1. The Structure. 
 2. Connective Tissue. 
 3. Uses of Membrane. 
 L 4. Fat. 
 
 THE STRUCTURE 
 THE SKIN. 
 
 4. THE TEETH 
 
 5. THE GLANDS 
 
 1. TheCutis; its composition and character. 
 
 2. The Cuticle ; its composition and character. 
 
 3. The value of the Cuticle. 
 
 4. The Complexion. 
 
 f a. Description 
 | h. Method of Growth. 
 \ c, Hair-dyes, and Cos- 
 metics. 
 
 [ d. Muscular tissue, 
 j a. Uses. 
 ( b. Method of growth. 
 
 1. Number and kinds of Teeth. 
 
 9 The. twr, cftc j * Tne Milk Teeth. 
 
 2. The tw o sets -j 2 The p ermanent Teeth 
 
 3. Structure of the Tieih. 
 
 4. The Decay of the Teeth. 
 
 5. The Preservation of the Teeth. 
 
 1. The two kinds 
 
 2 The Perspiration. 
 
 J 1. Oil Glands. 
 
 I 2. Perspiratory Glands, 
 
 f 1. About Washing and Bathing. 
 2. The Reaction. 
 
 C. HYGIENE. 
 
 3. Sea-Bathing. 
 
 4. Clothing. 
 
 a. General Principles. 
 
 b. Linen. 
 
 c. Cotton 
 
 d. Woolen. 
 
 e. Flannel. 
 
 f. Color of Clothing. 
 
 g. Structure of doming 
 .h. .Insufficient Clothing. 
 
 1. Corns. 
 
 2. In -growing Nails, 
 
 3. Warts. 
 
 4. Chilblains. 
 
RESPIRATION 
 
 AND 
 
 THE VOICE. 
 
 THE ORGANS of Bespiration and the Voice are the 
 larynx, the trachea, and the lungs. 
 
 Description of the Organs of the Voice. 1. THE 
 LARYNX. In the neck, is a lump sometimes called 
 Adam's apple. It is the front of the larynx. This is 
 a small, gristly box, placed at the top of the wind- 
 pipe, just below the tongue. The opening into it 
 from the throat is called the glottis ; and the cover, 
 the epiglottis. The latter is a spoon-shaped lid, 
 which opens when we breathe, but shuts when we 
 swallow, and so lets our food slip over it into the 
 tube (oesophagus, e-sof ' -a-gus] leading to the stom- 
 ach (Fig. 23). 
 
 If we laugh or talk when we swallow, our food is 
 apt to "go the wrong way," i. e., little particles 
 pass into the larynx, and the tickling sensation they 
 produce forces us to cough, to expel the intruders. 
 
 2. THE VOCAL CORDS. On each side of the glottis 
 are the so-called vocal cords. They are not really 
 cords, but elastic membranes projecting from the 
 3 
 
50 RESPIRATION AND THE VOICE. 
 
 Fig. 23. 
 
 Passage to the (Esophagus and Windpipe ; c, the tongue ; d, the soft palate, ending 
 in g, the uvula ; h, the epiglottis ; i, the glottis ; I, the oesophagus ; f, the pharynx. 
 
 sides of the box across the open- 
 ing. When not in use, they 
 spread apart and leave a V- 
 shaped orifice (Fig. 24), through 
 which the air passes to and from 
 the lungs. If the cords are 
 tightened, the edges approach 
 each other, and, being thrown 
 into vibration, cause correspond- 
 ing vibrations in the current of 
 s produced in 
 
DIFFERENT TONES OF THE VOICE. 1 
 
 the same manner as by the vibrations of the strings 
 of a violin, only in this case the strings are scarcely 
 an inch long. 
 
 Experiment. Ask your butcher for a sheep's larynx; trim off the 
 flesh, and dry the cartilages. You can then examine at leisure the struc- 
 ture of the cords. 
 
 Different Tones of the Voice. The higher tones 
 of the voice are produced when the cords are short, 
 
 The Lungs, showing the Larynx. A, the windpipe ; H, the bronchial tubes. 
 
 tight, and closely in contact ; the lower in the oppo- 
 site way. When boys are about fourteen years of 
 
62 RESPIRATION AND THE VOICE. 
 
 age, the larynx enlarges, and the cords grow propor- 
 tionately longer and coarser; hence, the voice be- 
 comes deeper, or, as we say, "changes." 
 
 Formation of Vocal Sounds. A vocal sound re- 
 quires the action of the larynx. Speech is voice 
 modified by the lips, tongue, palate, and teeth. 
 
 Experiments. Open your mouth and make the pure vowel sounds 
 a, e, i, etc. , noting how the form of the aperture is changed for each vowel 
 by the tongue and the lips. Then try the consonants. You will discover 
 that m and n can be made only by blocking the air in the mouth and send- 
 ing it through the nose ; I lets the air escape at the sides of the tongue ; r 
 needs a vibratory movement of the tongue ; b and p stop the breath at the 
 lips, and d and t, at the back of the palate. Now place your hand on your 
 throat, and note the absence of vibrations when you whisper, and their 
 presence when you speak aloud. Continuing your experiments, you will 
 find that a sigh is only a vocalized groan ; that a laugh is a convulsive 
 repeating of the vowels a, e, or o ; and that a whistle is not a vocal but a 
 pure mouth sound. 
 
 Fig. 3 
 
 Bronchial Tubes, with clusters of cells. 
 
 Consonants made by the 
 lips are termed labials; 
 those by pressing the 
 tongue against the teeth, 
 dentals ; those by the 
 tongue, linguals. A child 
 first learns to pronounce the 
 vowel a, then the conso- 
 nants 6, m, and p, and 
 afterward their unions ba, 
 ma, pa. 
 
 Description of the Organs 
 of Respiration. Beneath 
 the larynx is the windpipe, 
 
HOW WE BREATHE. 6 
 
 or trachea (Fig. 25). It is strengthened by C- shaped 
 cartilages with the openings behind, where they are 
 attached to the oesophagus. At the lower end, the 
 trachea divides into two branches, called the right 
 and left bronchi. These subdivide in the small bron- 
 chial tubes, which ramify through the lungs like the 
 branches of a tree, the tiny twigs of which at last 
 end in clusters of cells so small that there are 
 000,000,000 in all. Along the air-passages are tiny 
 thread-like projections (cilia). These are constantly 
 waving to and fro, and serve as a screen to catch the 
 dust swept in with the breath. 
 
 Experiment. Procure the lungs (vulgarly called "lights ") of some 
 slaughtered animal. Insert a quill in the windpipe, and inflate them. 
 Notice how soft and sponge-like is the structure. See how they will float 
 on water. Then squeeze a bit between your fingers and note the creaking 
 sound. 
 
 Wrappings of the Lungs. The lungs are wrapped 
 in a double membrane (the pleura) one layer being 
 attached to the lungs and the other to the walls of 
 the chest. This secretes a lubricating fluid, making 
 the layers glide upon each other with ease. 
 
 How we Breathe. Respiration consists of two 
 acts taking in the air, or inspiration, and expelling 
 the air, or expiration. 
 
 1. INSPIRATION. When we draw in a full breath, 
 we straighten the spine and throw the head and 
 shoulders back, so as to give the greatest advantage 
 to the muscles. At the same time, the diaphragm 
 the muscular partition between the chest and the 
 abdomen (C, Fig. 27) descends and presses the walls 
 
RESPIRATION AND THE VOICE. 
 
 Fig. 27. 
 
 A, the heart ; B, the lungs drawn aside to show the internal organs ; C, the dia~ 
 phragm ; D, the liver ; E, the gall cyst ; F, the stomach , G, the small intestine ; H, 
 the transverse colon. 
 
 of the abdomen outward. Both these processes 
 increase the size of the chest. Thereupon, the elas- 
 tic lungs expand "to occupy the extra space, while 
 the air, rushing in through the windpipe, pours 
 along the bronchial tubes, and crowds into every 
 cell. 
 
 2. EXPIRATION. When we forcibly expel the air 
 from our lungs, the operation is reversed. We bend 
 forward, draw in the walls of the abdomen, and 
 press the diaphragm upward, while the ribs are 
 
THE NEED OF AIR. 55 
 
 pulled downward, all together diminishing the size 
 of the chest, and forcing the air outward. 
 
 Ordinary, quiet breathing is performed mainly by 
 the diaphragm, one breath to every four beats of 
 the heart, or eighteen per minute. 
 
 Modifications of the Breath. Coughing is a vio- 
 lent expiration in which the^ air is driven through 
 the mouth. Sneezing differs from coughing, the air 
 being forced through the nose. Snoring occurs 
 when the air passes through both nose and mouth, 
 while the palate flaps in the divided air-current, and 
 so throws it into vibration. Laughing and crying 
 are very much alike. The expression of the face is 
 necessary to distinguish between them. The sounds 
 are produced by short, rapid contractions of the 
 diaphragm. Hiccough is confined to inspiration. 
 It is caused by a contraction of the diaphragm and 
 a sudden closing of the glottis ; the entering current 
 of air strikes the closed glottis and gives rise to the 
 well-known sound. 
 
 The Capacity of the Lungs. If we take a deep 
 inspiration, and then forcibly exhale all the air we 
 can expel from the lungs, this amount, termed the 
 breathing capacity, will be, for a man of average 
 height, about 230 cubic inches, or one gallon. In 
 addition, it is found that the lungs contain about 100 
 cubic inches which cannot be expelled, thus making 
 their entire contents about 330 cubic inches, or 
 eleven pints. In ordinary breathing, only about 
 twenty or thirty cubic inches (less than a pint) of air 
 pass in and out. 
 The Need of Air The body needs food, clothing, 
 
56 &ESPIKATION AND THE VOICE. 
 
 sunshine, bathing, and drink ; but above all these 
 is the need for air. The other wants may be met 
 by occasional supplies, but air must be furnished 
 every moment or we die. 
 
 Air consists of one-fifth oxygen, and four-fifths 
 nitrogen. The active and vital element is oxygen. 
 Taken alone, this would be too stimulating, but the 
 passive nitrogen restrains it. No tonic is so refresh- 
 ing as a few full, deep breaths of cold pure air, 
 which sets every organ aglow with the energy of 
 the fiery oxygen gas. 
 
 Action of the Air in the Lungs. In the delicate 
 cells of the lungs, the air gives up its oxygen to the 
 blood, and receives in turn carbonic-acid gas and 
 water, foul with waste matter which the blood has 
 picked up in its circulation through the body. The 
 blood, thus purified and laden with the inspiring 
 oxygen, goes bounding through the system, while 
 the air we exhale carries off the impurities. In this 
 process, the blood changes from purple to red. 
 
 Experiments. 1. Breathe into a jar, and lower into it a lighted 
 candle. The flame will be instantly extinguished, thus indicating the 
 presence of carbonic-acid gas. 2. Breathe upon a mirror, and a film of 
 moisture will show the vapor. 3. Confine a breath in a bottle. The ani- 
 mal matter will soon decompose and give off an offensive odor. 
 
 Analysis of the Expired Air shows that it has lost 
 about one-fourth of its oxygen, and gained an equal 
 amount of carbonic-acid gas, besides moisture, and 
 organic impurities. Our breath, then, is air robbed 
 of its vitality, and containing in its place a gas as 
 fatal to life as it is to a flame, and effete matter 
 
CONCERNING THE NEED OF VENTILATION. 5? 
 
 which is disagreeable to the smell, injurious to the 
 health, and may contain the germs of disease. 
 
 The Evil Effect of Rebreathing the air cannot be 
 over-estimated. We take back into our bodies that 
 which has just been rejected, and the blood leaves 
 the lungs, bearing, not invigorating oxygen, but 
 refuse matter to obstruct the whole system. We 
 soon feel the effect. The muscles become inactive ; 
 the blood stagnates ; the heart acts slowly ;. the 
 food is undigested ; the brain is clogged ; and the 
 head aches. 
 
 The constant breathing of even the slightly-impure 
 air of our houses tends to undermine health. The 
 unpurified blood is ready to receive the seeds of dis- 
 ease. The system, deprived of the inspiring oxygen, 
 is sensitive to cold. Pale cheeks, lusterless eyes, 
 languid steps, speak but too plainly of oxygen star- 
 vation. In such a soil, catarrh, scrofula, and con- 
 sumption run riot. 
 
 oncerning the Need of Ventilation. The impuri- 
 ties which pass off from the lungs and through the 
 pores of the skin do not fall to the floor, but diffuse 
 themselves through the surrounding atmosphere. A 
 single bad breath will taint the air of a whole room. 
 A light will vitiate as much air as a dozen persons. 
 Many breaths and lights, therefore, rapidly unfit the 
 air for our use. 
 
 The perfection of ventilation is reached when the 
 air of a room is as pure as that out of doors. To 
 accomplish this result, we must allow for each person 
 600 cubic feet of space, besides providing thorough 
 ventilation. 
 
58 RESPIRATION AND THE VOICE. 
 
 In spite of these well-known facts, scarcely any 
 pains are taken to supply fresh air, while the doors 
 and windows where the life-giving oxygen might 
 creep in are carefully stopped. 
 
 THE SICK ROOM is often kept carefully closed. Yet 
 here the danger of bad air is intensified. The expired 
 breath of the patient is dangerous to himself as 
 well as to others. Nature is seeking to throw off 
 the poison of the disease. The scavengers of the 
 body are all at work, and the breath and the insen- 
 sible perspiration are loaded with impurities. 
 
 Experiment. When the sun is shining through a crack in the blinds 
 of a darkened room, watch the line of floating dust. This shows how 
 poisonous germs are frequently conveyed to our lungs. When a scarlet- 
 fever patient is uncovered, a cloud of such fine dust will rise from his 
 body, and will keep its contagious properties for days. 
 
 OUR SITTING-ROOMS, heated by furnaces or red-hot 
 stoves, frequently have no means of ventilation, or, 
 if provided, they are seldom used. A window is 
 occasionally dropped to give a little relief, as if pure 
 air were a rarity, and must be doled out to the suffer- 
 ing lungs in morsels, instead of full and constant 
 draughts. The inmates are starved by scanty lung- 
 food, and stupefied by foul air. The process goes on 
 year by year. The weakened and poisoned body at 
 last yields to disease. Death is often simply the pen- 
 alty for violating nature's laws. Bad air begets dis- 
 ease ; disease begets death. 
 
 IN OUR CHURCHES, the foul air left by the congrega- 
 tion on Sunday is shut up during the week, and 
 heated for the next Lord's day, when the people 
 assemble to re-breathe the polluted atmosphere. 
 
VENTILATION. 59 
 
 They are thus forced, with every breath they take, 
 to violate the physical laws of Him whom they meet 
 to worship, laws written not 3000 years ago upon 
 Mount Sinai on tables of stone, but to-day engraved 
 in the constitution of their own living, breathing 
 bodies. On brains benumbed and starving for oxy- 
 gen, the purest truth and the highest eloquence fall 
 with little force. 
 
 BED-ROOM VENTILATION. We sleep in a small bed- 
 room from which every breath of fresh air is ex- 
 cluded, because we fancy that all night-air is un- 
 healthy, and so we breathe its dozen hogsheads of 
 air over and over again, and then wonder why we 
 awaken in the morning so dull and unrefreshed ! 
 Return to our room after inhaling the fresh, morning 
 air, and the fetid odor we meet on opening the door, 
 is convincing proof how we have poisoned our lungs 
 during the night. There is a singular prejudice 
 against the night-air. Yet, as Florence Nightingale 
 aptly says, what other air can we breathe at night ? 
 In large cities, night-air is often more wholesome 
 than that of the day-time. 
 
 Every room needs 2000 feet of fresh air per houl 
 for every person it contains. Our ingenuity ought 
 to find some way of supplying this want. A part of 
 the care we devote to delicate articles of food, drink, 
 and dress would abundantly meet this prime neces- 
 sity of our bodies. 
 
 Open the windows both at the top and the bottom. 
 You need never fear the fresh night-air, except, per- 
 haps, in extreme damp weather, or in places where 
 malaria is known to exist. Put on plenty of clothing 
 
60 RESPIRATION AND THE VOICE. 
 
 to keep warm by day and by night, and then let the 
 inspiring oxygen come in as freely as God has given 
 it. Pure air is the cheapest necessity and luxury of 
 life. Let it not be the rarest ! 
 
 SCHOOL-ROOM VENTILATION. Who, 'ongoing from 
 the open air of a clear, bracing winter's day, into a 
 crowded school-room, late in the session, has not 
 noticed the disagreeable odor, and been for a mo- 
 ment nauseated and half-stifled by the oppressive 
 atmosphere ? It is not strange. See how many 
 causes here combine to pollute the air. If the room 
 is heated by a stove, quantities of carbonic-acid gas, 
 driven by downward drafts in the flue, escape 
 through seams, and cracks, and the occasionally- 
 opened door of the stove. In the case of a furnace, 
 the same effect is too often experienced, and the 
 odor of coal-gas is a common one, especially when 
 the fire is replenished. The insensible perspiration 
 is more active in children than in adults ; they, 
 moreover, rush in with their clothing saturated with 
 the perspiration induced by their sports ; so that, 
 on the average, each pupil, during school hours, 
 loads the air with about half -a-pint of aqueous vapor. 
 Some of the children come from homes that are 
 close, ill-ventilated, and uncleanly ; some from sick- 
 rooms, whence they bring in their clothing the 
 germs of disease ; and some may themselves bear 
 traces of illness, or have unsound organs, and so 
 their breath and exhalations be poisonous. 
 
 In addition, the air is filled with dust brought in 
 and kept astir by many busy feet ; by ashes from 
 the stove or furnace ; and especially by chalk-dust. 
 
VENTILATION. 61 
 
 The modern method of teaching requires a large 
 amount of black-board work, and the air of the 
 school-room is thus loaded with chalk-particles. 
 These collect in the nasal passages and the upper 
 part of the larynx, and irritate the membrane, per- 
 haps laying the foundation of catarrh. 
 
 The usual school-room atmosphere bears the natu- 
 ral fruit of frequent headaches, inattention, weari- 
 ness, and stupor. Instead of six hundred feet of 
 space being allowed for each pupil, as perfect ven- 
 tilation demands the lowest estimate being 250 feet 
 often not over one hundred feet are afforded. In- 
 stead of 2000 cubic feet of fresh air for each pupil 
 being supplied and as much foul air removed every 
 hour, the amount needed for perfect health per- 
 haps no means of ventilation at all are provided, and 
 an occasionally opened door, and the benevolent 
 cracks and chinks in the building, furnish the sole 
 relief for the suffering lungs. 
 
 How Shall We Ventilate ? The usual method of 
 ventilation depends upon the fact that hot air, being 
 lighter than cold air, tends to rise, and the cold air 
 sinks to take its place. 
 
 Experiments. 1. Open the door of a heated room, and hold a lighted 
 candle first at the top, and then at the bottom. You can see, by the bend- 
 ing of the flame, that there is a current of air setting outward at the top, 
 and another setting inward at the bottom of the opening. 2. Hold a hand- 
 kerchief loosely in front of a fire-place, and it will be drawn strongly toward 
 the opening ; or, if you hold there a smoldering paper, the smoke will 
 ascend the flue, both being caused by the difference of temperature 
 between the air in the room and the outside atmosphere. Upon this differ- 
 ence of temperature all ordinary ventilation is based. 
 
62 RESPIRATION AND THE VOICE. 
 
 A proper treatment of this subject and its practical applications would 
 require a book by itself. There ie room here for only a few general state- 
 ments and suggestions. 
 
 1. Two openings are always necessary to produce a thorough change 
 of the air. 
 
 Experiments. (1. ) Put a lighted candle in a bottle. The flame will 
 soon be extinguished. The oxygen of the little air in the bottle is burned 
 out, and carbonic acid has taken its place. (2. ) Now place over the mouth 
 of the bottle a lamp-chimney, and insert in the chimney a strip of card- 
 board, thus dividing the passage. On relighting the candle, it will burn 
 freely. The smoke of a bit of smoldering paper will show that two opposite 
 currents of air are established, one setting into the bottle, the other out- 
 ward. 
 
 2. In the winter, when our school-rooms, churches, etc., are heated 
 artificially, the required difference of temperature is kept up with little 
 difficulty. The fresh air admitted to the room should then be heated 
 either by a furnace, or by passing over a stove, or through a coil of steam- 
 pipes. This cold air should always be taken directly from out-doors, and not 
 from a cellar, or under a piazza, where contamination is possible. In order 
 to remove the impure air, there should be ventilators provided at or near 
 the floor, opening into air-shafts or pipes leading upward through the 
 roof, having proper orifices at the top. These ventilating-pipes should be 
 heated artificially so as to produce a draft. 
 
 3. In the summer, ventilation may be commonly provided for by opening 
 windows at the top and the bottom, on the sheltered side of the building, so 
 as to avoid drafts of air injurious to the occupants. On a dull, still, hot 
 day, when there is little difference of temperature between the inner and 
 the outer air, ventilation can be secured only by having a fire provided in 
 the ventilating shaft ; this, by exhausting the air from the room, will cause 
 a fresh current to pour in through the open windows. At recess, if the 
 weather permit, all the children should be sent out-doors, to allow the 
 clothing to be exposed to the purifying influence of the open air, and the 
 windows should be thrown wide open, to ventilate the room thoroughly. 
 In bad weather, rapid marching or calisthenic exercises will furnish exer- 
 cise, and also permit the airing of the room. 
 
 4. The school and the church are the centers for spreading contagious 
 diseases. The former is especially dangerous, and therefore great pains 
 shoujd be taken to exclude pupils attacked by or recovering from diph- 
 
VENTILATION. 63 
 
 theria, scarlet-fever, whooping-cough, etc., and even those who live in 
 houses where such sickness exists. 
 
 5. In our houses, the air is often contaminated by decaying vegetables 
 and other filth in the cellar ; by bad air drawn up into the cellar from the 
 soil, in consequence of the powerful draughts that our fires create ; by de- 
 fective gas and waste-pipes that let the foul air from cesspool or sewer- 
 spread through the house ; and by piles of refuse, or puddles of slops emp- 
 tied at the back-door. At the same time, the water in our wells, or in 
 streams that supply our towns and cities, receives too often the drainage 
 from out-houses and barn-yards, and so aids in introducing the most dan- 
 gerous poisons into our systems. 
 
 Open fire-places should be common, since they are efficient ventilators ; 
 they should never be closed for any cause. Fresh air admitted by a 
 hot-air register and impure air passed out by a chimney, form a simple and 
 thorough system. Our sleeping- apartments demand especial care. As soon 
 as the occupants leave the room, the bed-clothes should be removed, and 
 laid on the backs of chairs to air ; the bed be shaken up ; and the windows 
 thrown wide open. In the summer, the windows may be closed before the 
 sun is high ; the house is then left filled with the cool morning air. In 
 clamp and cold weather, a fire should be lighted in sleeping- apartments, 
 particularly if used by children or delicate persons, in order to dry the 
 bed-clothing, and also to prevent a chill on the part of the occupants. 
 
 Wonders of Respiration. The perfection of the 
 organs of respiration challenges our admiration. 
 So delicate are they that the least pressure would 
 cause exquisite pain, yet tons of air surge to and fro 
 through their intricate passages, and bathe their 
 innermost cells. We yearly perform at least 7,000,000 
 acts of breathing, inhaling 100,000 cubic feet of air, 
 and purifying over 3,500 tons of blood. This gigantic 
 process goes on constantly, never wearies or worries 
 us, and we wonder at it only when science reveals 
 to us its magnitude. In addition, by a wise econ- 
 omy, the process of respiration is made to subserve 
 
64 
 
 RESPIRATION AND THE VOICE. 
 
 a second use no less important, and the air we 
 exhale, passing through the organs of voice, is 
 transformed into prayers of faith, songs of hope, 
 and words of social cheer. 
 
 Diseases. 1. CONSTRICTION OF THE LUNGS is produced by tight 
 clothing. The ribs are thus forced inward, the size of the chest is dimin- 
 
 Fig. 28. 
 
 A. B. 
 
 A, the natural position of the Internal organs. B, when deformed by tight lacing. 
 MARSHALL says that the liver and the stomach have, in this way, been forced down- 
 ward almost as low as the pelvis. 
 
 ished, and the amount of inhaled air decreased. Stiff clothing, and 
 especially a garment that will not admit of a full breath without inconve- 
 nience, will prevent that free movement of the ribs so essential to health. 
 Any violation of the laws of respiration, even though it be fashionable, will 
 surely result in diminished vitality and vigor. 
 
PRACTICAL QUESTIONS. 65 
 
 2. PNEUMONIA (pneuma, breath) is an inflammation of the lungs, affect- 
 ing chiefly the air-cells. 
 
 3. CONSUMPTION is a disease which destroys the substance of the lungs. 
 Like other lung difficulties, it is caused largely by a want of pure air, a 
 liberal supply of which is the best treatment that can be prescribed for it. 
 
 4. DIPHTHERIA (dipMhera, a membrane) is a kind of sore-throat, in 
 which matter exudes from the mucous membrane. This stiffens into a 
 peculiar white substance, which appears in patches. Fever and debility 
 accompany this disease, which is so rapid and insidious in its advances as 
 to be exceedingly dreaded. 
 
 5. CROUP is an inflammation of the mucous membrane of the larynx 
 and trachea. The attack frequently comes on suddenly, and usually in 
 the night. It is accompanied by a peculiar "brassy,"' ringing cough, 
 which, once heard, can never be mistaken. It may prove fatal within a 
 few hours. (See Appendix. ) 
 
 6. STAMMERING depends, not on defects of the muscles, but on a want 
 of due control of the mind. When a stammerer is not too conscious of his 
 lack, and tries to form his words slow'ly, he speaks plainly, and may sing 
 well, for then his words must come in time. The stammerer should find 
 out his peculiar difficulty, and overcome it by exercise, and especially by 
 speaking only after a full inspiration. 
 
 PRACTICAL QUESTIONS. 
 
 1. What is the philosophy of " the change of voice " in a boy ? 
 
 2. Why can we see our breath on a frosty moining ? 
 
 3. When a law of health and a law of fashion conflict, which should we 
 obey ? 
 
 4. If we use a "bunk" bed, should we pack away the clothes when we 
 first rise in the morning ? 
 
 5. Why should a clothes-press be well ventilated ? 
 
 6. Should the weight of our clothing hang from the waist* or the 
 shoulder ? 
 
 7. Describe the effects of living in an overheated room. 
 
 8. What habits impair the power of the lungs ? 
 
 9. For full, easy breathing in singing, should we use the diaphragm 
 and lower ribs, or the upper ribs alone 
 
66 
 
 RESPIRATION AND THE VOICE. 
 
 10. Why is it better to breathe through the nose than the mouth ? 
 
 11. Why should not a speaker talk while returning home on a cold night 
 after a lecture ? 
 
 12. What part of the body needs the loosest clothing ? 
 
 13. What part needs the warmest ? 
 
 14. Why is a "spare bed " generally unhealthful ? 
 
 15. Is there any good in sighing ? 
 
 16. Should a hat be thoroughly ventilated ? How ? 
 
 BLACKBOARD ANALYSIS. 
 
 1. ORGANS op VOICE 
 
 2. ORGANS op RESPIRA- 
 TION. 
 
 1. The Larynx. 
 
 2. The Vocal Cords. 
 
 3. Different Tones of Voice. 
 
 4. Formation of Vocal Sounds. 
 
 f 1. The Trachea. 
 
 I 2. The Bronchial Tubes 
 
 I 3. The Cells. 
 
 ,4. The Lung- wrapping. 
 
 MODIFICATIONS OP THE 
 BREATH. 
 
 '1. Coughing. 
 
 2. Sneezing. 
 
 3. Snoring. 
 
 I 4. Laughing, and Crying. 
 
 \5, 
 
 5. CAPACITY or THIS LUNGS. 
 
 6. HYGIENE. 
 
 Hiccough. 
 
 The Need of Air. 
 Composition of the Air. 
 Action of Air in the Lungs. 
 Tests of the Breath. 
 Analysis of expired Air. 
 Effect of re-breathed Air. 
 
 a. The Sources of Im- 
 purity. 
 
 b The Sick-room. 
 
 c. The Sitting-room. 
 
 d. The Church. 
 
 
 e. The Bed- room. 
 
 f. The School-room. 
 
 1 g. How we shoulc; 
 ventilate. 
 
 7. THE WONDERS OP RESPIRATION. 
 
 Constriction of the Lungs. 
 
 Pneumonia. 
 / t,. Consumption. 
 
 8. DISEASES < 4 Diphtheria. 
 
 1 5. Croup. 
 
 \6. Stammering. 
 
THE CIRCULATION. 
 
 THE Organs of the Circulation are the heart, the 
 arteries, the veins, and the capillaries. 
 The Blood is the liquid by means of which the 
 circulation is effected. It permeates every part of 
 the body, except the cuticle, nails, hair, etc. The 
 average quantity in each person is about eighteen 
 pounds. It is composed of a thin, colorless liquid 
 
 Fig. 29. 
 
 A, corpuscles of human blood, highly magnified ; B, corpuscles in the blood 
 of an animal (a non-mammal). 
 
 (plasma), filled with red disks, or cells, so small that 
 3,500 placed side by side would measure only about 
 an inch. They have a tendency to collect in piles 
 like rolls of coin. The size and shape vary in the 
 blood of different animals. Disks are continually 
 
68 THE CIRCULATION. 
 
 forming in the blood, and as constantly dying 
 20,000,003 at every breath. (Draper). 
 
 Experiment. Get a drop of blood by pricking the end of your finger 
 with a needle. Place it on the slide, cover with a glass, and put it at 
 once under the microscope. You will see that the red disks group them- 
 selves in rows, while the white disks of which there is only one to every 
 three or four hundred red ones will seem to draw apart, and to change 
 their form continually. 
 
 The plasma also contains fibrin, albumen which 
 is found nearly pure in the white of an egg and 
 also various mineral substances, as iron, lime, mag- 
 nesia, phosphorus, potash, etc. 
 
 Uses of the Blood. The blood has been called 
 "liquid flesh"; but it is more than that, since it 
 contains the materials for making every organ. The 
 plasma is rich in mineral matter for the bones, and 
 in albumen for the muscles. The red disks are the 
 air-cells of the blood. They contain the oxygen so 
 essential to every operation of life. Wherever there 
 is work to be done or repairs to be made, there the 
 oxygen is needed. It stimulates to action, and tears 
 down all that is worn out. In this process, it com- 
 bines with and actually burns out parts of the 
 muscles and other tissues, as wood is burned in the 
 stove. The blood, now foul with the burned matter, 
 the ashes of this fire, is caught up by the circulation, 
 and whirled back to the lungs, where it is purified, 
 and again sent bounding on its way. 
 
 Coagulation. When blood is exposed to the air, it 
 coagulates. This is caused by the solidifying of the 
 fibrin, which, entangling the disks, forms the "clot." 
 The remaining clear, yellow liquid is the serum. 
 
THE HEAKT. 
 
 69 
 
 The coagulation soon checks all ordinary cases of 
 bleeding. When a wound is made, and bleeding 
 commences, the fibrin forms a temporary plug, as it 
 were, which is absorbed when the healing process is 
 finished. Thus we see how a Divine foresight has 
 provided not only for the ordinary wants of the 
 body, but also for the accidents to which it is liable. 
 
 The Heart. A, the right ventricle ; B, the left ventricle ; C, the right auricle ; 
 D, the left auricle ; M, the Aorta. 
 
 The Heart is the engine which propels the blood. 
 It is a hollow, pear-shaped muscle, about the size of 
 the fist. It hangs, point downward, just to the left 
 of the center of the chest (Fig. 27). It is enclosed in 
 
70 THE CIRCULATION. 
 
 a loose sac of membrane (the pericardium), that is 
 smooth as satin. 
 
 The Movements of the Heart consist of an alter- 
 nate contraction and expansion. These constitute 
 the beating of the heart which we hear so distinctly 
 between the fifth and sixth ribs. 
 
 Experiment. Place your ear over another person's heart. You can 
 detect two sounds ; the first, as the blood is leaving the heart ; the second, 
 as it falls into the pockets of the arteries, and the valves strike together. 
 During the first, the two ventricles contract ; during the second, the two 
 auricles. 
 
 Fig. 31. 
 
 Chambers of the Heart. A, right ventricle ; B, left ventricle ; C, right auricle 
 D, left auricle ; E, tricuspid valve ; F, bicuspid valve ; G, semi-lunar valves ; H, 
 valve of the aorta ; I, inferior vena cava ; K, superior vena cava ; L, L, pulmonary 
 veins. 
 
 The Auricles and Ventricles. The heart is divided 
 into four chambers. In an adult, each holds about 
 a wine-glassful. The upper ones, from appendages 
 
NEED OF TALVES IN THE HEART. 71 
 
 on the outside resembling the ears of a dog, are 
 called auricles (aures, ears) ; the lower ones are 
 termed ventricles. The auricle and ventricle on each 
 side communicate with each other, but the right and 
 left halves of the heart are entirely distinct, and per- 
 form different kinds of work. The left side propels 
 the red blood ; and the right, the dark. 
 
 The auricles are merely reservoirs to receive the 
 blood, and to furnish it to the ventricles as they 
 need. Their work being light, their walls are thin 
 and weak. On the other hand, the ventricles force 
 the blood, and are, therefore, made very strong. As 
 the left ventricle drives the blood so much further 
 than the right, it is thicker and stronger. 
 
 Need of Valves in the Heart. As the auricles do 
 not need to contract with 
 
 Fig. 
 
 much force simply to empty 
 their contents into the ven- 
 tricles below them, there is 
 no demand for any special 
 contrivance to prevent the 
 blood from setting back the 
 
 _ . Valves of the Veins. 
 
 wrong way. But, when the 
 
 strong ventricles contract, some arrangement is 
 necessary to prevent its escaping into the auricle 
 again. Besides, when they expand, the "suction 
 power" would tend to draw back again from the 
 arteries all the blood just forced out. This difficulty 
 is obviated by little doors, or valves, which will not 
 let the blood go the wrong way. 
 
 Experiment. The heart of an ox or a sheep may be used to show the 
 chambers and valves. The aorta (see Fig. 30 and p. 75) should be cut as 
 
72 THE CIRCULATION. 
 
 far as possible from the heart, and then, by pumping in water, the perfec- 
 tion of the valves will be finely exhibited. The ingenious pupil will devise 
 a method of illustrating the circulation of the blood as represented in Fig. 
 34, and thus obtain a clear idea of the action of this complex muscular 
 organ the heart. 
 
 The Tricuspid and Bicuspid Valves. At the 
 opening into the right ventricle, is a valve consisting 
 of three folds or flaps of membrane, whence it is 
 called the tri-cuspid valve (tri, three ; and cuspides, 
 points), and in the left ventricle, one containing two 
 flaps, and named the bi-cuspid valve. These hang 
 so loosely as to oppose no resistance to the passage 
 of the blood into the ventricles ; but, if any attempts 
 to go the other way, it gets between the flaps and 
 the walls of the heart, and, driving them outward, 
 closes the orifice. 
 
 The Semi-lunar Valves. In the passages outward 
 from the ventricles, are the semi-lunar valves, so 
 called from their half -moon shape. Each consists of 
 three little pocket-shaped folds of membrane, with 
 their openings in the direction which the blood is to 
 take. When it sets back, they fill, and, swelling 
 out, close the passage (Fig. 32). 
 
 The Arteries are the tube-like canals which convey 
 the blood from the heart. They are composed of an 
 elastic tissue, which yields at every throb of the 
 heart, and then slowly contracts again, keeping the 
 blood in motion during the expansion of the heart. 
 The elasticity of the arteries acts like the air-cham- 
 ber of a fire-engine, which converts the intermittent 
 jerks of the brakes or pump into the steady stream 
 of the hose-nozzle. 
 
"<$> 1 
 HE CAPILLARIES. 73 
 
 The Pulse. At the wrist (radial artery) and on 
 the temple (temporal artery) we can feel the expan- 
 sion of the artery by each little wave of blood set in 
 motion by the contraction of the heart. In health, 
 there are about seventy-two pulsations per minute. 
 They increase with excitement or inflammation, 
 weaken with loss of vigor, and are modified by 
 nearly every disease. The physician, therefore, finds 
 the pulse a good index of the state of the system and 
 the character of the disorder. 
 
 The Veins are the tube-like canals which convey 
 the blood to the heart. As they do not receive the 
 direct impulse of the heart, their walls are much 
 thinner and less elastic than those of the arteries. 
 At first small, they increase in size and diminish in 
 number as they gradually pour into one another, like 
 tiny rills collecting to form two rivers, the vena cava 
 ascending and the vena cava descending (Fig. 34), 
 which empty into the right auricle. 
 
 Valves similar in construction to those already 
 described are placed at convenient intervals, to guide 
 the blood in its course and prevent its setting back- 
 ward. 
 
 Experiment. Press your finger on the upper part of one of the blue 
 veins running along your arm toward your hand, and then pass it down- 
 ward so as to drive the blood backward. Swellings like little knots will 
 appear. Each of these marks the location of a valve, closed by the blood 
 you push before your finger. Remove the pressure, and the valve will 
 open, the blood set forward, and the vein collapse to its former size. 
 
 The Capillaries (capillus, a hair) form a fine net- 
 work of tubes, connecting the ends of the arteries 
 with the veins. So closely are they placed, that we 
 
u 
 
 THE CIRCULATION. 
 
 cannot prick the flesh with a needle without injur- 
 ing, perhaps, hundreds of them. The air-cells of the 
 blood deposit there their oxygen, and receive car- 
 bonic acid, while in the delicate capillaries of the 
 lungs they give up their load of carbonic acid in ex- 
 change for oxygen. 
 
 Experiment. Stretch, by means of twine and small splints, the 
 transparent web of a living frog's foot, and place it under the microscope. 
 You will see the blood disks winding in single file through the intricate 
 meshes of the capillaries, darting hither and thither, now pausing, swaying 
 to and fro with an uncertain motion, and anon dashing ahead again. 
 
 Fig. 33. 
 
 Circulation of the Blood in the Web of a Frog's Foot, highly magnified. A, an 
 artery ; B, capillaries crowded with disks, owiiig to a rupture just above, where the 
 disks are jammed into an adjacent mesh ; C, a deeper vetn ; the black spots are pig- 
 ment cells.- 
 
 The Circulation consists of two parts the lesser, 
 and the greater. 
 
 2. THE LESSER CIRCULATION. The dark blood 
 from the veins collects in the right auricle, and, 
 going through the tricuspid valve, empties into the 
 right ventricle. Thence it is driven past the semi- 
 lunar valves, through the pulmonary artery, to the 
 lungs. After circulating through the fine capil- 
 

 THE GREATER CIRCULATION. 
 
 75 
 
 Fig 3k. 
 
 Diagram illustrating the Circulation of the blood. A, vena cava descending (su- 
 perior) ; Z, vena cava ascending (inferior) ; C, right auricle ; D, right ventricle ; 
 E, pulmonary artery ; F P, lungs and pulmonary veins ; G, left auricle ; H, left 
 ventricle ; I, K, aorta. MARSHALL. 
 
 laries of the air-cells, it is returned, bright and 
 red, through the four pulmonary veins, to the left 
 auricle. 
 
 2. THE GREATER CIRCULATION. From the left 
 auricle, the blood is forced past the bicuspid valve to 
 the left ventricle ; thence it is driven through the 
 semi-lunar valves into the great aorta, the main 
 trunk of the arterial system. Passing through the 
 arteries, capillaries, and veins, it returns through 
 
76 THE CIRCULATION. 
 
 the vense cavse, ascending and descending (Fig. 34), 
 and gathers again in the right auricle. 
 
 Velocity of the Blood. It has been estimated that 
 a portion of the blood will make the tour of the body 
 in about twenty-three seconds, and that the entire 
 mass passes through the heart in from one to two 
 minutes. 
 
 Distribution and Regulation of the Heat of the 
 Body. 1. DISTRIBUTION. The natural temperature 
 is about 98. This is kept up by the action of the 
 oxygen within us. Each capillary tube is a tiny 
 stove, where oxygen is combining with the tissues 
 of the body. Every contraction of a muscle de- 
 velops heat. The warmth so produced is distributed 
 by the circulation of the blood. Thus the arteries, 
 veins, and capillaries form a series of hot-water 
 pipes, through which the heated liquid is forced by 
 a pump the heart while the heat is maintained by 
 a multitude of little fires placed here and there along 
 its course. 
 
 2. REGULATION. The temperature of the body is 
 regulated by means of the pores of the skin and 
 those of the mucous membrane in the air-passages. 
 When the system becomes too warm, the blood- 
 vessels on the surface expand, the blood fills them, 
 the fluid leaks into the perspiratory glands, pours out 
 upon the exterior, and by evaporation cools the body. 
 
 When the temperature of the body is too low, the 
 vessels contract, less blood goes to the surface, the 
 perspiration decreases, and the loss of heat by evapo- 
 ration diminishes. 
 
 Life by Death. The body is being incessantly cor- 
 
WONDERS OF THE HEART. 77 
 
 roded by the tireless oxygen. The scales of the 
 cuticle are constantly falling off and being replaced 
 from the cutis. The disks of the blood die, and new 
 ones spring into being. Every act is a destructive- 
 one. Not a bend of the finger, not a wink of the 
 eye, not a thought of the brain but is at some ex- 
 pense of the machine itself. Every process of life is 
 thus a process of death. The more rapidly this 
 change goes on, and fresh, vigorous tissue takes the 
 place of the old, the healthier and stronger we are. 
 
 Change of our Bodies. There is a belief that our 
 bodies change once in seven years. From the nature 
 of the case, the rate must vary with the labor we 
 perform ; the organs most used altering oftenest. 
 Probably the parts of the body in incessant employ- 
 ment are reorganized many times in a single year. 
 
 Wonders of the Heart. This marvelous little 
 engine throbs on continually at the rate of 100,000 
 beats per day, 40,000,000 per year, often 3,000,000,000 
 without a stop. Its vitality is amazing. Lay upon 
 a table the heart from a freshly-caught sturgeon, all 
 palpitating with life, and it will beat for days as if 
 itself a living creature. The most tireless of organs 
 while life exists, the heart is one of the last to yield 
 when life expire*. So long as a flutter lingers there, 
 we know the spark of being is not quite extin- 
 guished, and there is hope of restoration. During a 
 long life it will propel half a million tons of blood, 
 yet, with unfaltering labor, repair itself as fast as it 
 wastes, patiently keeping up the play of its valves 
 and the rhythm of its throb till "the wheels of life 
 stand still." 
 
78 THE CIRCULATION. 
 
 The Lymphatic Circulation. In nearly every part 
 of the body, mingled with the blood - capillaries, 
 is a second series of capillaries, termed the Lym- 
 phatics. Most of them converge into the thoracic 
 duct a small tube, about the size of a goose-quill, 
 emptying into the great veins of the neck (Fig. 35). 
 
 Fig. S5. 
 
 Lymphatics of the head and neck, showing the glands and, B, the thoracic duct, as 
 it empties into the left innominate vein at the junction of the left jugular and sub- 
 daman veins. 
 
 Along their course, the lymphatics pass through 
 glands, hard, pinkish bodies of all sizes, from that 
 of a hemp-seed to an almond. These glands are often 
 enlarged by disease, and are then easily felt. 
 
 THE LYMPH, which circulates through the lym- 
 phatics like blood through the veins, is a thin, color- 
 less liquid, very like the serum. This fluid, probably 
 in part an overflow from the blood-vessels, is gathered 
 up by the lymphatics, undergoes in the glands some 
 
X3X 
 
 DISEASES. 79 
 
 process of preparation not well understood, and is 
 then returned to the circulation. 
 
 ILLUSTRATIONS. The poisonous ingredients of most 
 cosmetics and hair-dyes are absorbed by the lym- 
 phatics, and so carried into the system. The same 
 result occurs when persons poison their hands with 
 the common wood-ivy. Animals that hibernate are 
 supported during the winter by the fat which their 
 absorbents carry into the circulation from the extra 
 supply they have laid up during the summer. In 
 famine or in sickness, a man unconsciously con- 
 sumes his own flesh. 
 
 Diseases. 1. CONGESTION is an unnatural accumulation of blood in 
 any part of the body. The excess is indicated by the redness. Thus, 
 when we put our feet in hot water, the capillaries expand by the heat, and 
 the blood sets that way to fill them. Blushing is a temporary congestion. 
 The capillaries, being expanded only for an instant by the nervous excite- 
 ment, contract again and expel the blood. 
 
 2. INFLAMMATION means simply a burning. When there is irritation 
 or an injury at any spot, the blood sets thither and reddens it. This extra 
 supply, both by its presence and the friction of the swiftly-moving cur- 
 rents, causes heat. The pressure of the distended vessels upon the nerves 
 frets them, and produces pain. The swelling stretches the walls of the 
 blood-vessels, and the serum or lymph oozes through. The four charac- 
 teristics of an inflammation are redness, heat, pain, and swelling. 
 
 3. BLEEDING, if from an artery, will be of red blood, and will come in 
 jets ; if from the veins, it will be of dark blood, and will flow in a steady 
 stream. If only a small vessel be severed, it may be checked by a piece of 
 cloth held or bound firmly upon the wound. If a large trunk be cut, es- 
 pecially in a limb, make a knot in a handkerchief and tie it loosely about 
 the limb ; then, placing the knot on the wound, with a short stick twist 
 the handkerchief tightly enough to stop the flow. If you have a piece of 
 cloth to use as a pad, the knot will be unnecessary. If it be an artery that 
 is cut, the pressure should be applied between the wound and the heart ; 
 if a vein, beyond the wound. If you are alone, and are severely wounded, 
 
80 THE CIRCULATION. 
 
 or in an emergency, like a railroad accident, use the remedy which has 
 saved many a life upon the battle-field, bind or hold a handful of dry 
 earth upon the wound, elevate the part, and await surgical assistance. 
 
 4. SCROFULA is generally inherited. It affects the lymphatic glands, 
 commonly those of the neck, forming "kernels," as they are called. Per- 
 sons inheriting this disease can ward off its insidious approaches only by 
 the utmost care in diet and exercise ; by the use of pure air, and warm 
 clothing ; and by avoiding late hours, and all excitants. Insufficient or 
 improper food, and lack of ventilation, rapidly develop the latent seeds of 
 this disease. 
 
 5. A COLD. "We change to a thinner dress, or, when heated, sit in a cool 
 place. The skin is chilled, and the perspiration checked. The blood, no longer 
 cleansed and reduced in volume by the drainage through the pores, sets to the 
 lungs for purification. That organ is oppressed, breathing becomes difficult, 
 and the extra mucus secreted by the irritated surface of the membrane is 
 thrown off by coughing. The mucous membrane of the nasal chamber sym- 
 pathizes with the difficulty, and we have " a cold in the head," or a catarrh. 
 In general, the excess of blood seeks the weakest point, and develops there 
 any latent disease. Thus, a party go out to walk and are caught in a rain ; 
 or, coming home from a heated assembly, throw off their coats to enjoy the 
 cool breeze. The next day, one has a fever, another a slight headache, 
 another pleurisy, another pneumonia, another rheumatism, while some 
 escape without injury. The last had enough vital force to withstand the 
 disturbance, but the others had weak points, to which the excess of blood 
 has gone, producing congestion. The first necessity is to restore a regular 
 circulation of the blood. Put the feet in hot water and let them become 
 gorged with the blood thus called from the congested organs. Or, go im- 
 mediately to bed, and with hot drinks and extra clothing open the pores, 
 and induce free perspiration. This calls the blood to the surface, and, by 
 equalizing the circulation, affords relief. 
 
 The rule for the prevention and cure of a cold is to keep the blood upon 
 the surface. 
 
ALCOHOLIC DRINKS AND NARCOTICS. 81 
 
 ALCOHOLIC DRINKS AND NARCOTICS. 
 I. ALCOHOL. 
 
 How Alcohol is Formed by Fermentation. When 
 any substance containing sugar, as fruit- juice, is 
 caused to ferment, the elements of hydrogen, carbon, 
 and oxygen, of which the sugar is composed, re- 
 arrange themselves so as to form carbonic acid, alco- 
 hol, and certain volatile oils and ethers. The carbonic 
 acid partly evaporates, and partly remains to give 
 life and sparkle to the liquor ; the alcohol is the 
 intoxicating principle ; while the oils and ethers im- 
 part the peculiar flavor. Thus wine is fermented 
 grape-juice, and cider is fermented apple-juice, each 
 having its distinctive fragrance. (For an account of 
 the subject of Fermentation, read Steele's New Chem-> 
 istry, page 192.) 
 
 Manufacture of Beer. The barley used for making 
 beer is first malted, i.e., sprouted, to turn a part of 
 its starch into sugar. When this process has gone 
 far enough, it is checked by heating the grain in a 
 kiln until the germ is destroyed. The malt is then 
 crushed, steeped, and fermented with hops and 
 yeast. The sugar gradually disappears, alcohol is 
 formed, and carbonic acid escapes into the air. The 
 beer is then put into casks, where it undergoes a 
 second, slower fermentation, the flavor ripens, and 
 the carbonic acid gathers ; when the liquor is drawn, 
 this gas bubbles to the surface, giving to the beer its 
 sparkling, foamy look. 
 
 Spirits. Alcohol is so volatile that, by the appli- 
 cation of heat, it can be driven off as a vapor from 
 
THE CIRCULATION. 
 
 Fig. 56. 
 
 Process Qf Distillation, 
 
 the fermented liquid in which it has been produced. 
 Steam and various fragrant substances will pass 
 over with it, and, if they are collected and condensed 
 in a cool receiver, a new and stronger liquid will be 
 formed, having a distinctive odor. 
 
 In this way, the alcohol of commerce is distilled 
 from whisky ; brandy, from wine ; rum, from fer- 
 mented molasses ; whisky, from fermented conr 
 barley or potatoes ; and gin, from fermented barley 
 and rye, afterward distilled with juniper berries. In 
 all liquors, the base is alcohol. It comprises from 
 3 to 8 per cent, of ale and porter, 7 to 17 per cent, of 
 wine, and 40 to 50 per cent, of brandy and whisky. 
 They may therefore be considered as alcohol more 
 or less diluted with water, and flavored with various 
 
THE PROPERTIES OF ALCOHOL. 83 
 
 aromatics. In taste, the different liquors as brandy, 
 gin, beer, cider, etc., vary greatly, but they all pro- 
 duce certain physiological effects due to their com- 
 mon ingredient alcohol. 
 
 The Properties of Alcohol may be illustrated in 
 the following very simple manner : 
 
 Experiments. 1. Pour a little alcohol into a saucer and apply an 
 ignited match. The liquid will suddenly take fire, burning with intense 
 heat, but feeble light. In this process, alcohol takes up oxygen from the 
 air, forming carbonic-acid gas, and water. 2. Hold a red-hot coil of plati- 
 num wire in a goblet containing a few drops of alcohol, and a peculiar odor 
 will be noticed. It denotes the formation of aldehyde a substance pro- 
 duced in the slow oxidation of alcohol. Still further oxidized, the alcohol 
 would be changed into acetic acid the sour principle of vinegar. 
 
 One of the most noticeable properties of alcohol is 
 its affinity for water. When strong alcohol is ex- 
 posed to the air, it absorbs moisture and becomes 
 diluted ; at the same time, the spirit itself evapo- 
 rates. The commercial or proof -spirit is about one- 
 half water ; the strongest holds ten per cent. ; and, to 
 obtain absolute or waterless alcohol, requires careful 
 distillation in connection with some substance, as 
 lime, that has a still greater affinity for water, and 
 so can despoil the alcohol. 
 
 Experiment. Put the white of an egg nearly pure albumen into 
 a cup, and pour upon it some alcohol, or even strong brandy ; the fluid 
 albumen will coagulate, becoming hard and solid. 
 
 Effect of Alcohol on the Circulation. During 
 the experiment described on page 74, the influence 
 of alcohol upon the blood may be very easily tested. 
 Place on the web of the frog's foot a drop of dilute 
 spirit. The blood-vessels immediately expand. 
 
84 THE CIRCULATION. 
 
 Channels before unseen open, and the blood-disks fly 
 along at a brisker rate. Next, touch the membrane 
 with a drop of strong spirit. The blood channels 
 quickly contract ; the cells slacken their speed ; and, 
 finally, all motion ceases. The flesh shrivels up and 
 dies. The circulation thus stopped is stopped for- 
 ever. The part affected will in time slough off. 
 Alcohol has killed it. 
 
 The influence of alcohol upon the human system 
 is similar. Diluted, as in wine or whisky, it dilates 
 the blood-vessels, quickens the circulation, hastens 
 the heart-throbs, and accelerates the respiration. 
 When strong, it acts as a poison. Persons have 
 drunk a quantity of liquor on a wager, and have 
 paid for their folly with their life. The whole of the 
 blood in the heart being turned into a clot, the circu- 
 lation ceased, and death was instantaneous. 
 
 Effect of Alcohol upon the Heart. What means 
 this rapid flow of the blood ? It shows that the 
 heart is overworking. The nerves that lead to the 
 minute capillaries and regulate the passage of the 
 vital current through the extreme parts of the body, 
 are paralyzed by this active narcotic. The tiny 
 blood-vessels at once expand. This enlargement re- 
 moves the resistance to the passage of the blood, 
 and hence to the beat of the heart, and the heart flies 
 like the main spring of a clock when the wheels are 
 taken out. 
 
 Careful experiments show that two ounces of alco- 
 hol an amount contained in the daily potations of 
 a very moderate ale or whisky drinker increase the 
 heart-beats GOOO in twenty-four hours ; a degree of 
 
EFFECT OF ALCOHOL UPON THE HEART. 85 
 
 work represented by that of lifting a weight of 
 seven tons to a height of one foot. Reducing this 
 sum to ounces and dividing, we find that the heart 
 is driven to do extra work equivalent to lifting seven 
 ounces one foot high 1493 times each hour ! 
 
 No wonder that the drinker feels a reaction, a 
 physical languor, after the earliest effects of his 
 indulgence have passed away. The heart flags, the 
 brain and the muscles are exhausted, and rest and 
 sleep are imperatively demanded. During this time 
 of excitement, the machinery of life has really been 
 " running down." " It is hard work to fight against 
 alcohol ; harder than rowing, walking, wrestling, 
 coal-heaving, or the tread-mill itself." 
 
 The pupil should be careful to note here that alcohol does not act upon 
 the heart directly, and cause it to contract with more force. The idea that 
 alcohol gives energy and activity to the muscles is entirely false. It really, 
 as we shall see hereafter, weakens muscular contraction. The enfeeble- 
 ment begins in the first stage, and continues in the other stages with in- 
 creased effect. The heart beats quickly merely because the resistance of 
 the minute controlling vessels is taken off, and it works without being 
 under proper regulation. What is called a stimulation or excitement is, 
 in absolute fact, a relaxation, a partial paralysis of one of the most im- 
 portant mechanisms in the animal body. Alcohol should be ranked among 
 the narcotics. (Richardson}. 
 
 Long-continued use of alcohol causes a ' ' degenera- 
 tion " of the muscular fiber of the heart, so that this 
 organ loses its old power to drive the blood, and, 
 after a time, fails to respond even to the spur that 
 has urged it to ruin. 
 
 THIS "DEGENERATION " of the various tissues of the body, we shall find, 
 as we proceed, is a marked effect of alcoholized blood. The change con- 
 
.86 THE CIRCULATION. 
 
 sists in an excess of liquid, or, more commonly, in a deposit of fat. This 
 fatty matter is not an increase of the organ, but it takes the place of a part 
 of its fiber, thus weakening the structure, and reducing the power of the 
 tissue to perform its regular work. Almost everywhere in the body we 
 thus find cells muscle-cells, liver-cells, nerve-cells, as the case may be 
 changing, one by one, under the influence of this potent disorganizer, into 
 unhealthy fat-cells. Alcohol has well been termed, "The Genius of De- 
 generation." 
 
 The cause of this degeneration can be easily explained. The increased 
 activity of the circulation compels a correspondingly-increased activity of 
 the cell-changes : but the essential condition of healthful change the 
 presence of additional oxygen is wanting, and the operation is imperfectly 
 performed. 
 
 Influence upon the Membranes. The flush of the 
 face and the blood-shot eye, that are such noticeable 
 effects of even a small quantity of liquor, indicate 
 the condition of all the internal organs. The deli- 
 cate linings of the stomach, heart, brain, liver, and 
 lungs, are reddened, and every tiny vein is inflamed, 
 like the blushing nose itself. When the use of 
 liquor is habitual, the congestion, which at first 
 passes slowly away after each indulgence, becomes 
 permanent, and the discolored blotched skin reveals 
 the state of the entire mucous membrane. 
 
 We learned on page 39 what a peculiar office the 
 membrane fills in nourishing the organs it enwraps. 
 Anything that disturbs its delicate structure must 
 mar its efficiency. Alcohol has a wonderful affinity 
 for water. To satisfy this greed, it will absorb 
 moisture from the tissues with which it comes in 
 contact, as well as from their lubricating juices. 
 
 The enlargement and permanent congestion of the 
 blood-vessels must interfere with the filtering action 
 
EFFECT UPON THE BLOOD. 8? 
 
 of the membrane. In time, all the membranes 
 become dry, thickened, and hardened ; they then 
 shrink upon the sensitive nerve, or stiffen the joint, 
 or enfeeble the muscle. The function of these mem- 
 branes being deranged, they will not furnish the 
 organs with perfected material, and the clogged 
 pores will no longer filter their natural fluids. 
 Every organ in the body will feel this change. 
 
 Effect upon the Blood. From the stomach, alco- 
 hol passes directly into the circulation, and so, in a 
 few minutes, is swept through the entire system. 
 If it be present in sufficient amount and strength, 
 its eager desire for water will lead it to absorb 
 moisture from the red disks, causing them to shrink, 
 change their form, harden, and lose some of their 
 ability to carry oxygen ; it may even make them 
 adhere in masses, and so hinder their passage 
 through the tiny capillaries. (Richardson). 
 
 The avidity of alcohol for water causes a burning 
 thirst, familiar to all drinkers, and hence the use of 
 enormous quantities of liquor, generally beer. This 
 dilutes the blood, which then easily flows from a 
 wound, and, as it does not coagulate like healthy 
 blood, renders an accident or surgical operation 
 dangerous. ? 
 
 Sometimes, on the contrary, when spirits are used 
 in excess, the blood tends to coagulate in the capil- 
 laries. There is then the liability of an obstruction 
 to the flow of the vital current through the heart, 
 liver, lungs, etc., that may cause disease, and in the 
 brain may lay the foundation of paralysis or apo- 
 plexy. 
 
88 THE CIRCULATION. 
 
 Wherever the alcoholized blood goes through the 
 body, it bathes the delicate cells with an irritating, 
 narcotic poison, instead of a bland, nutritious sub- 
 stance. 
 
 Effect upon the Lungs. Here we can see how 
 certainly the presence of alcohol interferes with the 
 red disks in their task of carrying oxygen. "Even 
 so small a quantity as one part of alcohol to 500 of 
 the blood will materially check the absorption of 
 oxygen in the lungs." 
 
 The cells, unable to take up oxygen, retain their 
 carbonic-acid gas, and so return from the lungs, 
 carrying back, to poison the system, the refuse mat- 
 ter the body has sought to throw off. Thus the 
 lungs no longer furnish properly-oxygenized blood. 
 
 The rapid stroke of the heart, already spoken of, 
 is followed by a corresponding quickening of the 
 respiration. The flush of the cheek is repeated in 
 the reddened mucous membrane lining the lungs. 
 
 When this enlargement of the capillaries becomes 
 permanent, and the highly-albuminous membrane 
 of the air-cells is hardened and thickened as well 
 as congested, the passage of the gases to and fro 
 through its pores can no longer be prompt and free 
 as before. Even when the effect passes off in a 
 few days after the occasional indulgence, there is, 
 during that time, a diminished supply of the life- 
 giving oxygen furnished to the system ; weakness 
 follows, and, in the case of hard drinkers, there is a 
 marked liability to epidemics. 
 
 A volume of statistics could be filled with quotations like the following : 
 "Mr. Huber, who saw in one town in Russia two thousand one hundred 
 
PRACTICAL QUESTIONS. 89 
 
 and sixty persons perish with the cholera in twenty days, said : ' It is a 
 most remarkable circumstance that persons given to drink have been 
 swept away like flies. In Tiflis, with twenty thousand inhabitants, every 
 drunkard has fallen, all are dead, not one remaining.' " 
 
 Physicians tell us, also, that there is a peculiar 
 form of consumption caused by long-continued and 
 excessive use of liquor. It generally attacks those 
 whose splendid constitution has enabled them to 
 " drink deep " with apparent impunity. This type 
 of consumption appears late in life and is considered 
 incurable. 
 
 PRACTICAL QUESTIONS. 
 
 1. Why does a dry, cold atmosphere favorably affect catarrh ? 
 
 2. Why should we put on extra covering when we lie down to sleep ? 
 
 3. Is it well to throw off our coats or shawls when we come in heated 
 from a long walk ? 
 
 4. Why are close-fitting collars or neck-ties injurious ? 
 
 5. Which side of the heart is the more liable to inflammation ? 
 
 6. When a fowl is angry, why does its comb redden ? 
 
 7. Why does a fat man endure cold better than a lean one ? 
 
 8. Why does one become thin during a long sickness ? 
 
 9. What would you do if you should come home "wet to the skin " ? 
 
 10. When the cold air strikes the face, why does it first blanch and then 
 flush ? 
 
 11. By what process is alcohol always formed ? Does it exist in nature ? 
 
 12. What per-centage of alcohol is contained in the different kinds of 
 liquor ? 
 
 13. What is the common intoxicating principle of whisky and brandy, 
 as of beer and cider ? 
 
 14. Describe the general properties of alcohol. 
 
 15. Show that alcohol is a narcotic poison. 
 
 16. If alcohol is not a stimulant, how does it cause the heart to over- 
 work ? 
 
90 
 
 THE CIRCULATION. 
 
 17. Why is the skin of a drunkard always red, and blotched ? 
 
 18. What must be the effect of tight lacing upon the circulation ? 
 
 19. Why does a hot foot-bath relieve the headache ? 
 
 BLACKBOARD ANALYSIS. 
 
 1. THE BLOOD 
 
 1. Its Composition. 
 ' Its Uses. 
 Coagulation. 
 
 2. ORGANS OP THE CIR- 
 CULATION. 
 
 1. The 
 Heart. 
 
 1. Description. 
 
 2. Movements. 
 
 3. Auricles and Ventricles. 
 
 (a. Need of. 
 
 4. The Valves. 1 b ' 
 
 c. Semi-lunar Valves. 
 
 3. THE CIRCULATION., 
 
 4. THE HEAT OF THE 
 BODY. 
 
 2. The j 1. Description. 
 Arteries "I 2. The Pulse. 
 
 8. The j 1. General Description. 
 Veins. ( 2. Valves. 
 
 4. The ( 1. Description. 
 Capilla--<2. Use. 
 ries. ( 3. Under the Microscope. 
 
 1. The Lesser. 
 
 2. The Greater. 
 
 3. The Velocity of the Blood. 
 
 1. Distribution. 
 
 2. Regulation. 
 
 5. LIFE BY DEATH. 
 
 6. CHANGE OF OUR BODIES. 
 
 7. WONDERS or THE HEART. 
 
 (I. Description. 
 
 8. THE LYMPHATIC Cm- J 2. The Glands. 
 
 13. rf _ r _ - 
 
 Illustrations. 
 
 ) 3. The Lymph. 
 (4. Illustrations 
 
 (\. Congestion. 
 | 2. Inflammation. 
 
 
 
 9. DISEASES ............ { 3. Bleeding. 
 
 i 4. Scrofula. 
 \J5. A Cold. 
 
 . How Alcohol is formed. 
 . Manufacture of Beer. 
 . Spirits. 
 
 . Properties of Alcohol. 
 10 ALCOHOLIC DRINKS \ 5. Effect of Alcohol upon the Circulation 
 
 AND NARCOTICS. 
 
 Heart. 
 
 to cause fatty degeneration, 
 upon the Membrane. 
 
 Blood. 
 11 Lungs. 
 
EFFECTS OF ALCOHOL UPON THE STOMACH. 
 
 Healthful 
 
 
 Ulcerous. 
 
 
 
 After a long Debauch 
 
 Death byDeliriumTremens 
 
 The Cancerous Stomach. 
 
DIGESTION AND FOOD. 
 
 "TTTHY we need Food. We have learned that 
 
 VV our bodies are constantly giving off waste 
 matter the products of the fire, or oxidation, as the 
 chemist terms it, going on within us. A man with- 
 out food will starve to death in a few days, i. e., the 
 oxygen will consume his available flesh. To replace 
 the daily outgo, we need about two and a quarter 
 pounds of food, and three pints of drink. 
 
 Including the eight hundred pounds of oxygen 
 taken from the air, a man uses in a year about a ton 
 and a half of material. Yet during this entire time 
 his weight may be nearly uniform. 
 
 Our bodies, says Huxley, may be likened to an 
 eddy in the river, which retains its shape for a 
 while, though every instant each particle of water 
 is changing. 
 
 What Food Does. We make no force ourselves. 
 We can use only what nature provides. All our 
 strength comes from the food we eat. Food is force 
 that is, it contains a power which it gives up to us when 
 it becomes our flesh. Oxygen is the magic key 
 which unlocks for our use this hidden store. Put- 
 ting food into our bodies is like placing a wound-up 
 spring in a watch ; every motion of the body is 
 
92 DIGESTION AND FOOD. 
 
 dependent upon the food-force just as every move- 
 ment of the hand on the watch-dial represents the 
 power of the spring. 
 
 Every cell in the tissues is full of matter ready to set free at call its stored- 
 up energy derived from the meat, bread, and vegetables we have eaten. 
 This energy will pass off quietly when the organs are in comparative rest, 
 but violently when the muscles contract with force. When we send an 
 order through a nerve to any part of the body, a series of tiny explosions 
 run the entire length of the nerve, just as fire runs through a train of gun- 
 powder. The muscle receives the stimulus, and, contracting, liberates its 
 energy. The cells of nerve or muscle, whose contents have thus exploded, 
 as it were, are useless, and must be carried off by the blood, just as ashes 
 must be swept from the hearth, and new fuel be supplied to keep up a fire. 
 
 Kinds of Food Needed. In order to produce heat 
 and force, we need something that will burn, i. e., 
 with which oxygen can combine. To keep the body 
 in the best condition, we require three kinds of food. 
 
 1. FOOD CONTAINING NITROGEN. This is needed for 
 the growth and repair of the muscles, which so 
 readily oxidize and provide us with force. Cheese, 
 lean meat, and the whites of eggs are examples of 
 nitrogenous, or, as it is generally called, albuminous 
 food. 
 
 ' 2. FOOD CONTAINING CARBON. This comprises the 
 sugars and the fats. In digestion, starch (which is 
 abundant in potatoes, corn, etc.) is changed to sugar, 
 and hence is ranked with this class of food. 
 
 Experiment. Take a slice of raw potato, and let fall on it a few 
 drops of very weak tincture of iodine found at any drug-store. Iodine 
 turns starch blue. Note the effect on the potato, which shows the starch 
 it contains. 
 
OBJECT OF DIGESTION. 93 
 
 3. FOOD CONTAINING MINERAL MATTER. -- Our 
 bodies need water, iron, sulphur, magnesia, phospho- 
 rus, salt, potash, etc. 
 
 About three pints of water are required daily to 
 dissolve our food and carry it through the circula- 
 tion, to float off waste matter, to lubricate the 
 tissues, and to cool the system. Water also com- 
 poses a large share of the body. A man weighing 
 154 pounds contains 100 pounds of water, about 12 
 gallons, enough, if rightly arranged, to drown him. 
 
 Iron goes to the blood disks ; lime helps to give 
 solidity to the bones and teeth ; phosphorus is essen- 
 tial to the activity of the brain. Salt assists in di- 
 gestion, and also aids in working off waste products 
 from the system. 
 
 One Kind of Food is Insufficient. A person fed only 
 on sugar, for example, would die. It would be a clear 
 case of nitrogen starvation. He might live some time 
 on nitrogenous food alone, as that contains carbon, the 
 elements of water, and some mineral matter. But 
 it would take such an enormous quantity of food 
 -lean meat, for instance to supply the carbon, 
 that his poor stomach would at last be sure to give 
 up in despair. 
 
 The need of a mixed diet is shown in the fact that 
 instinct everywhere suggests it. Butter is used 
 with bread ; oil is relished with salad ; milk is 
 boiled with rice ; cheese is eaten with maccaroni, 
 and pork is baked with beans. 
 
 Object of Digestion. If food were cast directly 
 into the blood, it could not be used. For example, 
 although the chemist cannot see wherein the albu- 
 
94 
 
 DIGESTION AND FOOD. 
 
 Fig. 37. 
 
 men of the egg differs from the albumen of the 
 blood, yet if it be injected into the veins it will not 
 serve the purposes required, and is thrown out again. 
 Digestion fits the food for use in the body. 
 
 General Plan of Digestion. Nature has provided 
 for this purpose an entire laboratory, furnished with 
 
 a chemist's outfit of knives, 
 mortars, baths, chemicals, 
 filters, etc. The food is (1) 
 chewed, mixed with the 
 saliva in the mouth, and 
 swallowed ; (2) acted upon 
 by the gastric juice in the 
 stomach ; (3) passed into the 
 intestines, where it receives 
 the bile, pancreatic juice, 
 and other liquids which dis- 
 solve it ; (4) the nourishing 
 part is absorbed in the 
 stomach and intestines, and 
 thence thrown into the 
 blood-vessels, whence it is 
 whirled through the body 
 by the circulation. These 
 processes take place within 
 tne ctl'i'iYi6 r YitciT'y ccfucti^ a nar- 
 row, winding tube which 
 begins at the mouth, 
 and is about thirty feet 
 long. 
 
 I. Mastication.!. THE SALIVA. The food while 
 being cut and ground by the teeth is mixed with 
 
 The Stomach and Intestines. 1, 
 stomach; 2, duodenum 3, small in- 
 
 7, ascending colon ; 8, transverse 
 colon; 9, descending colon; 10, sig- 
 moid flexure of the colon ; 11, rec- 
 tum ; 12, spleen a gland whose 
 action is not understood. 
 
Yw 
 
 9 J 
 
 MASTICATION. 
 
 95 
 
 '. 38. 
 
 The Parotid one of the three salivary glands 
 that open into the month by ducts. 
 
 the saliva. This is 
 a colorless, frothy, 
 alkaline liquid, secre- 
 ted (i. e., separated 
 from the blood), by 
 the mucous mem- 
 brane lining the 
 mouth, and by the 
 salivary glands. The 
 amount, on the aver- 
 age, is about three 
 pounds per day, and 
 in health is sufficient to keep the mouth moist. The 
 saliva changes the starch of our food into sugar, 
 and, by softening and dissolving what we eat, en- 
 ables us to get the different flavors. 
 
 2. THE PROCESS OF SWALLOWING. The food, thus 
 pulverized, softened, and lubricated by the saliva, is 
 conveyed by the tongue and cheek to the back of the 
 mouth. The soft palate lifts to close the nasal open- 
 ing ; the epiglottis shuts down, and along this bridge 
 the food is borne, without danger of falling into the 
 windpipe or escaping into the nose. The muscular 
 bands of the throat now seize it and take it beyond 
 our control. The fibers of the oesophagus contract 
 above, while they are lax below, and convey the food 
 by a worm-like motion into the stomach. 
 
 Experiment. Observe the peculiar motion of the oesophagus by 
 watching a horse's neck when he is drinking. 
 
 II. Gastric Digestion. 1. THE STOMACH is shaped 
 very like a Scotch bag-pipe, and holds about three 
 
96 DIGESTION AND FOOD. 
 
 pints. It is composed of three coats, or layers : (1), 
 an inner, soft, mucous membrane, which secretes 
 the digestive fluids ; (2), an outer, strong, smooth 
 coat which prevents friction and gives support ; and 
 (3), between them, a stout muscular layer composed 
 of fibers, some lying lengthwise, some obliquely, 
 and some passing round the stomach. When these 
 fibers contract, they produce a peculiar churning 
 motion which thoroughly mixes the contents of the 
 stomach. At the further end, the muscular fibers 
 form a gateway (pylorus, a gate), which carefully 
 guards the exit, to prevent food from passing out of 
 the stomach until properly prepared. 
 
 2. THE GASTRIC JUICE. The inner lining of the 
 stomach is soft, velvety, and of a pinkish hue ; but, 
 as soon as food is admitted, the blood-vessels fill, and 
 the surface becomes a bright red. Soon there exudes 
 a thin, colorless, acid fluid the gastric juice. About 
 twelve pounds of this are daily secreted. Its flow is 
 checked by cold water, and may be stopped by anger, 
 fatigue, or anxiety. 
 
 The chief value of the gastric juice consists in a 
 peculiar substance called pepsin, which causes the 
 albuminous food to dissolve, but has no effect on the 
 fats or the sugars. 
 
 The food, reduced by the gastric juice to a grayish, 
 soupy mass, called chyme (klme), escapes through 
 that jealously-guarded door, the pylorus. 
 
 III. Intestinal Digestion. The structure of the 
 intestines is like that of the stomach. There is the 
 same outer, smooth membrane to prevent friction, 
 the lining of mucous membrane to secrete the diges- 
 
DIGESTIVE TRACT. 
 
 Fig. S9. 
 
 97 
 
 Diagram of the Digestion of the Fcod. Notice how the food is submitted to the action 
 of alkaline, acid, and then alkaline fluids. 
 
98 DIGESTION AND FOOD. 
 
 tive fluids, and the muscular coating to push the 
 
 food forward. 
 
 The intestines are divided into the small, and the 
 
 large. The first part 
 of the former opens out 
 of the stomach, and is 
 called the du-o-de'-num, 
 as its length is equal to 
 the breadth of twelve 
 fingers. Here the chyme 
 
 A vertical Section of the Duodenum, highly is acted Upon by the 
 
 cuucie f -f!fri.n^ 8 oj tf& bile, and the pancreatic 
 
 . 
 
 gland* ; 5, orifice of duodenal glands ,-7, . . 
 more highly magnified sections of the cells of JUlCe. 
 a duodenal gland. 
 
 1. THE BILE is secre- 
 
 ted by the liver, which is the largest gland in the 
 body, and weighs about four pounds. It is located 
 on the right side, below the diaphragm. The bile 
 is of a dark, golden color, and bitter taste. About 
 three pounds are daily secreted. When not needed 
 for digestion, it is stored in the gall cyst. 
 
 In the tiny liver-cells (each one smaller than a fine pin's head), sugar is 
 changed into a kind of insoluble starch called glycogen. This is stored up 
 in the liver and muscles until 'needt??! elsewhere, when it is once more con- 
 verted into soluble sugar and taken up by the circulation. The liver also 
 changes the waste and surplus albuminous matter into bile, and into 
 urea and uric acid the forms in which nitrogenized waste is excreted by 
 the kidneys. 
 
 2. THE PANCREATIC JUICE is a secretion of the 
 pancreas, or sweet-bread a gland nearly as large as 
 the hand, lying behind the stomach. This alkaline 
 juice, which has also the power of changing starch 
 to sugar, breaks the globules of fat into minute par- 
 
THE SMALL INTESTINES. 
 
 99 
 
 tides, that mix freely with water, and remain sus- 
 pended in it like butter in milk. The whole mass 
 now has a milky look, whence it is termed chyle 
 (kile), and passes on to the small intestine. 
 
 3. THE SMALL INTESTINE is an intricately-folded 
 tube, about twenty feet long, and from an inch to 
 an inch and one-half in diameter. As the chyle 
 
 The Mucous Membrane of the Ilium, highly magnified. 1, cellular structure of the 
 epithelium, or outer layer ; 2, a vein ; 3, fibrous layer ; 4, villi covered with epithelium ; 
 5, a villus in section, showing its lining of epithelium, with its blood-vessels and lym- 
 phatics ; 6, a villus partially uncovered ; 7, a villus stripped of its epithelium ; 8, 
 lymphatics, or lacteals ; 9, orifices of the glands opening between the vuli ; 10, 11, 12, 
 glands ; 13, capillaries surrounding the orifices of the gland. 
 
 passes through this winding channel, it receives 
 secretions which combine the action of all the pre- 
 vious ones, and affect equally the starch, fat, and 
 albumen. 
 IV. Absorption is performed by the veins, and the 
 
100 DIGESTION AND FOOD. 
 
 lacteals. (1.) The Veins in the stomach immediately 
 begin to take up the water, salt, and other sub- 
 stances that need no special preparation. In the 
 small intestine, there is a multitude of tiny projec- 
 tions (villi) from the folds of the mucous membrane, 
 more than 7000 to the square inch, giving it a soft, 
 velvety look. These little rootlets, reaching out into 
 the milky fluid, drink into their minute blood-vessels 
 the nutritious part of every sort of food. 
 
 (2.) The Lacteals, a set of vessels starting in the 
 villi side by side with the veins, absorb the principal 
 part of the fat. They convey the chyle through 
 the lymphatics and the thoracic duct (Fig. 35) to 
 the veins, and so within the sweep of the circula- 
 tion. 
 
 The Portal Vein carries to the liver the food ab- 
 sorbed by the veins of the stomach and the villi of 
 the intestines. In the cells of the liver, it undergoes 
 as mysterious a process as that performed by the 
 lymphatic glands, and is then cast into the circula- 
 tion. 
 
 The Length of Time Required for digesting a full 
 meal is from two to four hours. It varies with the 
 kind of food, state of the system, thoroughness of 
 mastication, etc. 
 
 In 1822, Alexis St. Martin, a Canadian in the employ of the American 
 Fur Company, was accidentally shot in the left side. Two years after, the 
 wound was entirely healed, leaving, however, an opening about two and a 
 half inches in circumference into the stomach. Through this the mucous 
 membrane protruded, forming a kind of valve which prevented the dis- 
 charge of food, but could be readily depressed by the finger, thus exposing 
 the interior. For several years he was under the care of Dr. Beaumont, a 
 
V, 
 
 VALUE OF DFF ERENT KINDS' OF FOOD. 01 
 
 skillful physician, who exij^spjented upon him by giving him various kinds 
 of food, and watching their digestion through this opening. His stomach 
 was found empty in two and a half hours after a meal of roast turkey, 
 potatoes, and bread. Pigs' feet and boiled rice were disposed of in an hour. 
 Fresh, sweet apples took one and a half hours ; boiled milk, two hours ; 
 and unboiled, a quarter of an hour longer. In eggs, which occupied the 
 same time, the case was reversed, raw ones being digested sooner than 
 cooked Roast beef and mutton required three, and three and a quarter 
 hours respectively ; veal, salt beef, and broiled chicken remained for four 
 hours ; and roast pork enjoyed the bad pre-eminence of needing five and a 
 quarter hours. 
 
 Value of Different Kinds of Food. BEEF and MUT- 
 TON possess the greatest nutritive value of any meats. 
 LAMB is less strengthening, but more delicate. PORK 
 has much carbon. It sometimes contains a parasite 
 called trichina, which passes into the human system, 
 producing disease and often death ; the only safety 
 is in thorough cooking. FISH is more watery than 
 flesh, and many find it difficult of digestion. Like 
 meat, it loses its mineral properties and natural 
 juices when salted, and becomes less nourishing. 
 Oysters are highly nutritious, but are more easily 
 digested raw than cooked. MILK is a model food, as 
 it contains albumen, starch, fat, and mineral matter. 
 No single substance can sustain life for so long a 
 time. CHEESE is very nourishing one pound being 
 equal in value to two of meat, but it is not adapted 
 to a weak stomach. EGGS are most easily digested 
 when the white is barely coagulated, and the yolk is 
 unchanged. BREAD should be made of unbolted 
 flour. The bran of wheat furnishes the mineral 
 matter we need in our bones and teeth, gives the 
 bulk so essential to the proper distension of the 
 
1C# DIGESTION AND FOOD. 
 
 digestive organs, and by its roughness gently stimu- 
 lates them to action. Very fresh bread, warm bis- 
 cuit, etc., are condensed by mastication into a pasty 
 mass that is not easily penetrated by the gastric 
 juice, and hence they are unwholesome. CORN is 
 rich in fat. It contains, however, more indigestible 
 matter than any other grain, except oats, and is less 
 nutritious than wheat. The POTATO is two-thirds 
 water, the rest being mainly starch. RIPE FRUITS, 
 and those vegetables usually eaten raw, dilute the 
 food, and supply the blood with cooling acids. 
 
 The Stimulants. COFFEE is about half nitrogen, 
 and the rest fatty, sadcharme, and mineral sub- 
 stances. It is, therefore, of much nutritive value, 
 especially when taken with milk and sugar. Its 
 stimulating property is due to a substance called 
 cdff&faie. Its aroma is developed by browning, but 
 destroyed by burning. 
 
 No other drink so soon relieves fatigue. Taken in 
 moderation, it clears the intellect, tranquillizes the 
 nerves, and usually leaves no unpleasant reaction. 
 In some cases, however, it produces a rush of blood 
 to the head, and should be at once discarded. At the 
 close of a full meal it hinders digestion, and at night 
 produces wakefulness. 
 
 TEA possesses an active principle called theine, and 
 also contains tannin, which, if the tea is strong, 
 coagulates the albumen of the food tans it and 
 thus delays digestion. 
 
 Experiment. Let a drop of strong tea fall on a steel knife-blade. 
 The black spot produced is a tannate of iron, a compound of the tannic 
 acid in the tea and the metal. 
 

 / /*\ ' 
 
 <& //o ( 
 
 THE COOKING OF FOOD. 103 
 
 When used moderately, the effect of tea resembles 
 that of coffee ; in excess, it causes nervous tremor, 
 disturbed sleep, palpitation of the heart, and indiges- 
 tion. In youth, when the vital powers are strong 
 and nature promptly rallies from fatigue, these 
 stimulants are needless, and often positively inju- 
 rious. 
 
 The Cooking of Food breaks the little cells and 
 softens the fibers of which it is composed. In broil- 
 ing or roasting, meat should be exposed to a strong 
 heat at once, in order to coagulate the albumen 
 upon the outside, and thus prevent the escape of the 
 nutritious juices. The cooking may then be finished 
 at a lower temperature. The same principle applies 
 to boiling meat. In making soups, on the contrary, 
 the heat should be applied slowly, and should reach 
 the boiling point only for a few moments at the close. 
 This prevents the coagulation of the albumen. Fry- 
 ing is an unwholesome mode of cooking food, as it 
 disorganizes the fat. 
 
 Rapid Eating produces many evil results. 1. There 
 is not enough saliva mixed with the food ; 2. The 
 coarse pieces resist the action of the digestive fluids ; 
 3. The food is washed down with drinks that dilute 
 the gastric juice, and hinder its work ; 4. We do not 
 realize how much we eat until the stomach is over- 
 loaded ; 5. Failing to get the taste of our food, we 
 think it insipid, and hence use condiments that fret 
 the digestive organs. In these various ways, the 
 stomach is over-worked, and the foundation of dys- 
 pepsia laid. 
 
 The Quantity and Quality of Food required vary 
 
104 DIGESTION AND FOOD. 
 
 with age and habits. The diet of a child should be 
 largely vegetable, and more abundant than that of 
 an aged person. An inactive life calls for less food 
 than an active one. When a boy accustomed to 
 out-door work enters school, he should practice self- 
 denial until his system becomes fitted to the new 
 order of things. He should not, however, fall into 
 the opposite error, and starve himself. 
 
 The season, also, should modify the diet. In win- 
 ter, we need highly carbonaceous food plenty of 
 fat meat, etc. ; but in summer we should temper the 
 heat in our corporeal stoves with fruits and vege- 
 tables. 
 
 The climate, too, has its necessities. The inhabi- 
 tants of the frigid north have an almost insatiable 
 longing for fat. Thus, in 1812, when the Allies 
 entered Paris, the Cossacks drank all the oil from 
 the lamps, and left the streets in darkness. In trop- 
 ical regions, Nature furnishes the proper diet of 
 fruits. 
 
 "SVhen Food should be Taken. On taking food, 
 the blood sets at once to the alimentary canal, and 
 the energies become fixed upon digestion. We 
 should not, therefore, undertake hard study, labor, 
 or exercise, directly after a hearty meal. He who 
 toils with brain or muscle, and thus centers the 
 blood in any particular organ, before eating should 
 allow time for the circulation to become equalized. 
 There should be an interval of four to five hours be- 
 tween our regular meals, and there should be no 
 lunching between times. With young children, 
 where the vital processes are more rapid, less time 
 
THE WONDERS OF DIGESTION. 105 
 
 may intervene. Nothing should be eaten within two 
 or three hours of retiring. 
 
 How Food should be Taken. A good laugh is 
 the best of sauces. The meal-time should be the 
 happiest hour of the day. Care and grief are the 
 bitterest foes of digestion. A cheerful face and a 
 light heart are friends to long life, and nowhere do 
 they serve us better than at the table. 
 
 Need of a Variety. Experiments show that no 
 one article of food, however nutritious, will keep up 
 the highest working-power of the body. Nature 
 demands change, and she furnishes the means to 
 gratify it. We should avoid, however, the other 
 extreme, and not, by too great variety, over-tempt 
 the appetite. 
 
 The Wonders of Digestion. We can understand 
 much of the process of digestion. We can look into 
 the stomach and trace its various steps. Indeed, the 
 chemist can reproduce in his laboratory many of the 
 operations; "a step further," as Fontenelle has 
 said, "and he would surprise nature in the very 
 act." Just here, when he seems so successful, he is 
 compelled to pause. The secret of the cell Nature's 
 tiny laboratory eludes his search. 
 
 How strange is this change of food to flesh ! We 
 make a meal of meat, vegetables, and drink. 
 Ground by the teeth, mixed by the stomach, and 
 dissolved by the digestive fluids, it is swept through 
 the body. Each organ, as it passes, snatches its 
 particular food, which, within the cells of its tissues, 
 it transforms into the soft, sensitive brain, or the 
 hard, callous bone ; into briny tears, or bland saliva, 
 
106 DIGESTION AND FOOD. 
 
 or acrid perspiration ; into bile for digestion, oil for 
 the hair, nails for the fingers, or flesh for the cheek. 
 
 Diseases. 1. DYSPEPSIA, or indigestion of food, is generally caused 
 by over-taxing the digestive organs. We tempt ourselves with luscious 
 flavors and a great variety of dishes, till we overload the stomach and 
 burden the entire system. We take meals at irregular hours, when the 
 fluids are not ready. We force a hearty supper upon the body when, 
 wearied with the day's labor, it demands repose. We devote the shortest 
 possible time to meals, and thrust upon our stomachs unrnasticated lumps 
 of food, washing them down with floods of ice-cold water or scalding tea. 
 Nature having taken away our appetite in order to rest our weak diges- 
 tion, we forthwith excite it by stimulants and narcotics, and still further 
 oppress the suffering organs. Strong tea, alcoholic drinks, hot bread, 
 rich pastry, biscuit and cake yellow with soda or saleratus, meat fried till 
 the fat is disorganized and the fiber hardened, all these derange the action 
 of the alimentary canal. The patient, abused stomach struggles on, per- 
 haps for years, through discomfort, pain, and the accumulating agonies of 
 indigestion, till finally the last penalty of violated law is paid, and the 
 confirmed dyspeptic finds relief in death. 
 
 2. THE MTJMPS are a swelling of the parotid gland (one of the salivary 
 glands, Fig.' 37). The disease is generally epidemic, and the patient 
 should be carefully secluded for the sake of others as well as himself. The 
 swelling may be allowed to take its course. Relief from pain is often 
 obtained by applying flannels wrung out of hot water. Great care should 
 be used not to check the inflammation, and, on first going out after 
 recovery, not to take cold. 
 
 ALCOHOLIC DRINKS AND NARCOTICS. 
 i. ALCOHOL (Continued from p. 89). 
 
 Relation of Alcohol to the Digestive Organs. 
 
 Is Alcohol a Food 9 To answer this question, let us. 
 make a comparison. If you receive into your 
 
ALCOHOLIC DRINKS, ETC. 107 
 
 stomach a piece of bread or beef, Nature welcomes 
 its presence. The juices of the system at once take 
 hold of it, dissolve it, and transform it for the uses 
 of your body. A million tiny fingers (lacteals and 
 veins) reach out to grasp it, work it over, and carry it 
 into the circulation. The blood bears it onward 
 wherever it is needed to mend or to build "The 
 house you live in." Soon, it is no longer bread or 
 beef ; it is flesh on your arm ; its chemical energy 
 has become your strength. 
 
 If, on the other hand, you take alcohol into your 
 stomach, it receives no such welcome. Nature treats 
 it as a poison, and seeks to rid herself of the intruder 
 as soon as possible. The juices of the system flow 
 from every pore to dilute and weaken it, and to pre- 
 vent its shriveling up the delicate membranes with 
 which it comes in contact. The veins take it up 
 and bear it rapidly through the system. All the 
 scavengers of the body the lungs, the kidneys, the 
 perspiration-glands at once set to work to throw off 
 the enemy. So surely is this the case, that the 
 breath of a person who has drunk only a single glass 
 of the lightest beer will betray the fact. 
 
 So far as known, the alcohol thus rejected is en- 
 tirely unchanged. Nature seems to have no use for 
 it, so it courses everywhere through the circulation 
 and into the great organs, with all its properties un- 
 altered. 
 
 Alcohol, then, is not, like bread or beef, broken up 
 by the mysterious process of digestion, for the benefit 
 of the body, " It cannot therefore be regarded as a 
 food." (Flint.) " That alcohol is incapable of form- 
 
108 
 
 DIGESTION AND FOOD. 
 
 ing any part of the body, is admitted by all physiolo- 
 gists. It cannot be converted into brain, nerve, 
 muscle, or blood." (Cameron.) 
 
 Effect upon the Digestion. Alcohol precipitates 
 (causes to settle) the pepsin of the gastric juice, and 
 so hinders its work ; it also coagulates the albumen 
 of the food, and thus still further obstructs diges- 
 tion. Anything that interferes with Nature's plan 
 of getting our food ready for our use must be inju- 
 rious. The experiments of Dr. Munroe, published in 
 the London Medical Journal, and here summarized, 
 show that the tendency to retard digestion is com- 
 mon to alcoholic drinks. 
 
 Minced Beef 
 put into 
 
 2d Hour. 
 
 4th Hour. 
 
 6th Hour. 
 
 8th Hour. 
 
 10th Hour. 
 
 I. 
 
 Gastric juice 
 and water. 
 
 Beef 
 opaque. 
 
 Digesting and 
 separating. 
 
 Beef much 
 lessened. 
 
 Broken up 
 into shreds. 
 
 Dissolved 
 like soup. 
 
 n. 
 
 Gastric juice 
 and alcohol. 
 
 No alteration 
 perceptible. 
 
 Slightly 
 opaque, but 
 beef 
 unchanged. 
 
 Slight coating 
 ou beef. 
 
 No visible 
 change. 
 
 Solid on 
 cooling. 
 Pepsin 
 precipi- 
 tated. 
 
 m. 
 
 Gastric juice 
 and pale ale. 
 
 No 
 change. 
 
 Cloudy, 
 with fur on 
 beef. 
 
 Beef partly 
 loosened. 
 
 No further 
 change. 
 
 No diges- 
 tion. Pep- 
 sin pre- 
 cipitated 
 
 The greed of alcohol for water causes it to imbibe 
 moisture from the tissues and juices, and to inflame 
 the delicate mucous membrane. It shows how pa- 
 tiently nature adapts herself to circumstances, that 
 the soft, velvety lining of the throat and stomach 
 should come at length to endure the presence of a 
 fiery liquid which, undiluted, would soon shrivel and 
 
EFFECT UPON THE LIVER. 109 
 
 destroy it. In self-defence, the juices pour in to 
 weaken the alcohol, and it is soon hurried into the 
 circulation. Before this can be done, "it must ab- 
 sorb about three times its bulk of water ; " hence, 
 very strong liquor may be retained in the stomach 
 long enough to interfere seriously with the diges- 
 tion, and to injure the lining coat. Habitual use of 
 alcohol permanently dilates the blood-vessels ; thick- 
 ens and hardens the membranes ; in some cases, 
 ulcerates the surface ; and, finally, so weakens the 
 digestion that the proper supply of food cannot be 
 appropriated. (Flint. ) 
 
 Effect upon the Liver. Alcohol is carried by the 
 portal vein directly to the liver. This organ, after 
 the brain, holds the largest share. The influence of 
 the poison is here easily traced. " The color of the 
 bile is soon changed from yellow to green, and even 
 black." The connective tissue between the cells 
 becomes inflamed, and matter is sometimes depos- 
 ited, causing "fatty degeneration," so that the liver 
 is increased to twice its natural size. In the con- 
 firmed drunkard, the fibrous tissue shrinks, the cells 
 are closed, the organ becomes smaller, and the sur- 
 face assumes a peculiar appearance known as the 
 " hob-nailed liver." 
 
 Effect upon the Kidneys. The kidneys, like the 
 liver, are liable to undergo, through the influence of 
 alcohol, a " fatty degeneration," in which the cells, 
 becoming filled with fat, are unable to separate the 
 waste material that comes to them to be thrown off. 
 This poisonous matter, therefore, is returned to the 
 circulation. Worst of all, the membranes may be 
 
110 DIGESTION AND FOOD. 
 
 so affected as to allow the albuminous part of the 
 blood to filter through them, and thus rob the body of 
 one of its most valuable constituents. 
 
 Does Alcohol Impart Heat ? Directly after drink- 
 ing liquor, a flush is felt. This is caused by the tides 
 of warm blood that are being sent to the surface of 
 the body, in consequence of the enlargement of the 
 capillaries, and the rapid pumping of the heart. No 
 fresh heat is developed. On the contrary, the bring- 
 ing the blood to the surface causes it to cool faster, 
 and a reaction follows. The inebriate becomes chilly 
 as he sobers, and a delicate thermometer placed 
 under his tongue may show a fall of even two de- 
 grees below the standard temperature of the body. 
 Several hours are required to restore the usual heat. 
 
 Dr. N. S. Davis, of Chicago, instituted an extensive series of experi- 
 ments to determine the effect of the different articles of food and drink on 
 the temperature of the system. He proved that, during the digestion of 
 all kinds of food, the temperature of the body is increased, but when alcohol 
 is taken, the temperature begins to fall within a half-hour, and continues 
 to decrease for two or three hours ; and that the reduction of temperature, 
 in extent as well as in duration, is in exact proportion to the amount of 
 alcohol. 
 
 We see, therefore, that liquor does not fortify 
 against cold. Dr. Hayes, the Arctic explorer, says : 
 " While fat is absolutely essential to life in Arctic 
 countries, alcohol is positively injurious. I have 
 known strong, able-bodied men to become utterly 
 incapable of resisting cold in consequence of the 
 long-continued use of alcoholic drink. %> 
 
 Does Alcohol Impart Strength ? Experience shows 
 
DOES ALCOHOL IMPART STRENGTH ? Ill 
 
 that alcohol unfits one for severe bodily exertion. 
 Men who are in training for running, rowing, and 
 other contests where great strength is required, deny 
 themselves all liquors, even when ordinarily accus- 
 tomed to their use. 
 
 Dr. Richardson made some interesting experiments to show the influence 
 of alcohol upon muscular contraction. He carefully weighted the hind leg 
 of a frog, and, by means of electricity, stimulating the muscle to its utmost 
 power of contraction, he found out how much the frog could lift. Then 
 administering alcohol, he discovered that the response of the muscles to 
 the electrical current became feebler and feebler, as the narcotic began to 
 take effect, until, at last, the animal could raise less than half the amount 
 it lifted by the natural contraction when uninfluenced by alcohol. 
 
 Effect upon the Waste of the Body. The ten- 
 dency of alcohol is to check the ordinary waste of 
 the system, so that " the amount of carbonic acid 
 exhaled from the lungs may be reduced as much as 
 30 to 50 per cent.'' (Hinton.) We have seen that 
 when the functions are. in full play, each organ is 
 being constantly torn down, and as constantly re- 
 built with materials furnished from our food. Any- 
 thing that checks this oxidation of the tissues, or 
 hinders the deposition of new matter, diminishes the 
 vital force. Both these results are the certain 
 effects of alcohol, for, since the blood contains less 
 oxygen and more carbonic acid, and since the power 
 of digesting food is decreased, it follows that every 
 process of waste and repair must be weakened. The 
 person using liquor therefore needs less bread and 
 beef, and so he wrongfully imagines that alcohol is 
 a food. 
 
112 DIGESTION AND FOOD. 
 
 Alcohol Creates a Progressive Appetite for itself. 
 When liquor is habitually taken, even in the most 
 moderate quantity, it soon becomes necessary ; and 
 then arises a craving demand for an increased 
 amount to produce the original effect. No food 
 creates this constantly-augmenting want. A cup of 
 milk drunk at dinner does not lead one to go on, day 
 by day, drinking more and more milk, until to get 
 milk becomes the one great longing of the whole 
 being. Yet this is the almost universal effect of 
 alcohol. Hunger is satisfied by any nutritious food : 
 the dram-drinker's thirst demands alcohol. Com- 
 mon observation teaches the peril that attends the 
 formation of such a progressive poison-habit. A 
 single glass taken as a simple tonic may lead to the 
 drunkard's grave. 
 
 Worse than this, the alcoholic craving may be 
 transmitted from father to son. Young persons 
 often find themselves cursed with a terrible disease 
 known as alcoholism (dipsomania) a keen, morbid, 
 overwhelming appetite for liquor stamped upon their 
 very being through the reckless indulgences of some 
 ancestor. 
 
 The Law Of Heredity is, in this connection, well worth notice. 
 "The world is beginning to perceive," says Francis Galton, "that the life 
 of each individual is, in some real sense, a continuation of the lives of his 
 ancestors.'' " Each of us is the footing up of a double column of figures 
 that goes back to the first pair." " We are omnibuses," remarks Holmes, 
 "in which all our ancestors ride." We inherit from our parents our 
 features, our physical vigor, our mental faculties, and even much of our moral 
 character. Often, when one generation is skipped, the qualities will reappear 
 in the following one. The virtues, as well as the vices, of our forefathers, 
 have added to, or subtracted from, the strength of our brain and muscle. 
 
PRACTICAL QUESTIONS. 113 
 
 The evil tendencies of our natures, which it is the struggle of our lives to 
 resist, constitute a part of our heir-looms from the past. Our descend- 
 ants, in turn, will have reason to bless us only if we hand down to them 
 a pure and healthy physical, mental, and moral being. 
 
 "There is a marked tendency in nature to transmit all diseased condi- 
 tions. Thus, the children of consumptive parents are apt to be con- 
 sumptives. But of all agents, alcohol is the most potent in establishing 
 a heredity that exhibits itself in the destruction of mind and body. Its 
 malign influence was observed by the ancients long before the production 
 of whisky, or brandy, or other distilled liquors, and when fermented 
 liquors or wines only were known. Aristotle says, ' Drunken women 
 have children like unto themselves,' and Plutarch remarks, 'One drunk- 
 ard is the father of another.' The drunkard by inheritance is a more 
 helpless slave than his progenitor, and his children are more helpless still, 
 unless on the mother's side there is an untainted blood. For there is not 
 only a propensity transmitted, but an actual disease of the nervous system. " 
 (Dr. Willard Parker. ) 
 
 PRACTICAL QUESTIONS. 
 
 1. How do clothing and shelter economize food ? 
 
 2. Is it well to take a long walk before breakfast ? 
 
 3. Why is warm food easier to digest than cold ? 
 
 4. Why is salt beef less nutritious than fresh ? 
 
 5. What should be the food of a man recovering from a fever? 
 
 6. Is a cup of black coffee a healthful close to a hearty dinner ? 
 
 7. Should ice-water be used at a meal ? 
 
 8. Why is strong tea or coffee injurious ? 
 
 9. Should food or drink be taken hot ? 
 
 10. Are fruit-cakes, rich pastry, and puddings wholesome ? 
 
 11. Why are warm biscuit and bread hard of digestion? 
 
 12. Should any stimulants be used in youth ? 
 
 13. Why should bread be made spongy ? 
 
 14. Which should remain longer in the mouth, bread or meat ? 
 
 15. Why should cold water be used in making soup, and hot water in 
 boiling meat ? 
 
 16. Name the injurious effects of over-eating. 
 
 17. Why do not buckwheat cakes, with syrup and butter, taste as well 
 in July as in January ? 
 
114 
 
 DIGESTION AND FOOD. 
 
 18. Why is a late supper injurious ? 
 
 19. What makes a man " bilious " ? 
 
 20. What is the best remedy ? Ans. Diet to give the organs rest, and 
 active exercise to arouse the secretions and the circulation. 
 
 BLACKBOARD ANALYSIS. 
 
 1. WHY WE NEED FOOD. 
 
 2. WHAT FOOD DOES. 
 
 3. KINDS OF FOOD 
 
 4. ONE KIND is INSUFFICIENT 
 
 ( 1. 
 ....... { 2. 
 
 \ 3. 
 
 Nitrogenous. 
 
 Carbonaceous 
 
 Minerals 
 
 5. OBJECT OF DIGESTION. 
 
 6. PROCESS or DIGESTION 
 
 General Plan. 
 
 1. Mastication. . . . 
 
 2. Gastric Digestion . . 
 
 3. Intestinal Digestion 
 4 Absorption 
 
 a The Sugars. 
 b. The Fats. 
 
 j a. The Saliva. 
 
 \ b. Process of Swallowing. 
 
 a. The Stomach 
 
 b. The Gastric Juice, 
 c The Chyme. 
 
 Description. 
 
 a. The Bile. 
 
 b. The Pancreatic Juice. 
 
 c. The Small Intestine. 
 
 7. HYGIENE. 
 
 f 1. Length of Time required 
 
 2. Value of different kinds of Food. 
 
 3. The Stimulants. \ * Coffee. 
 
 1 D. iea. 
 
 4. Cooking of Food. 
 
 5. Rapid Eating. 
 
 6. Quantity and Quality of Food. 
 
 7. When Food should be taken. 
 
 8. How " " " " 
 
 9. Need of a Variety. 
 
 8. THE WONDERS OF DIGESTION. 
 
 9. DISEASES. . . 
 
 10. ALCOHOLIC DRINKS o 
 AND NARCOTICS. ~ "* 
 
 1. Dyspepsia. 
 
 2. The Mumps. 
 
 1. Is Alcohol a Food ? 
 
 2. Effect upon the Digestion. 
 
 4. " " " Kidney^. 
 
 5. Does Alcohol impart Heat ? 
 
 6. " " " Strength? 
 
 7. The Effect upon the Waste of the Itody. 
 
 8. Alcohol creates a progressive appetite for itself. 
 
 9. The Law of Heredity. 
 

 THE NERVOUS SYSTEM 
 
 STRUCTURE. The nervous system includes the 
 brain, the spinal cord, and the nerves. It is 
 composed of two kinds of matter the white, and the 
 gray. The former consists of milk-white, glistening 
 fibers, sometimes as small as ^T^TF of an inch in 
 diameter ; the latter is a jelly-like substance, made 
 up of small, ash-colored cells. This often gathers in 
 little masses, termed ganglions (ganglion, a knot), 
 because when a nerve passes through a group of the 
 cells, they give it the appearance of a knot. The 
 gray cells produce the nervous force, and the nerve 
 fibers conduct it. The ganglia answer to the stations 
 along a telegraphic line, where messages are received 
 and forwarded ; the fibers correspond to the wires. 
 
 The Brain is the seat of the mind. Its average 
 weight is about fifty ounces. fegg-shaped and yield- 
 ing, it fills closely the cavity of the skull. It rests 
 on a water-bed, being surrounded by a double mem- 
 brane, delicate as a spider's web, which forms a sac 
 filled with a liquid resembling water. Within this, 
 closely wrapping the brain, is a fine tissue (pia 
 mater), with a mesh of blood-vessels which dips 
 down into the hollows, and bathes them so copiously 
 
116 
 
 THE NERVOUS SYSTEM. 
 
 Fig. It's. 
 
 The Nervous Syste -n. A, cer^rum ; B, ctt , bMuin . 
 
THE CEREBRUM. 
 
 117 
 
 that it uses one-fifth of all the blood in the body. 
 Around the whole is wrapped a tough membrane 
 (dura mater), which lines the" bony box of the skull, 
 and separates the various parts of the organ by 
 strong partitions. The brain consists of two parts 
 the cerebrum, and the cerebellum. 
 
 The Cerebrum fills the front and upper part of the 
 skull, and comprises about seven-eighths of the en- 
 tire weight of the brain. It is divided into two 
 
 Fig. It3. 
 
 Surface of the Cerebrum. 
 
 hemispheres, connected beneath by fibers of white 
 matter. Thus we have two brains, as well as two 
 hands and two eyes. As animals rise in the scale of 
 life, this higher part makes its appearance. It is a 
 mass of white fibers, with cells of gray matter 
 
118 
 
 THE NERVOUS SYSTEM. 
 
 sprinkled on the outside, or lodged here and there 
 in ganglia. It is curiously wrinkled and folded, much 
 like the meat of an English walnut. This structure 
 gives a large surface for the gray matter. The 
 wrinkles, which are very slight in infancy, increase 
 in size and number according to the mental growth 
 and ability of each individual. 
 The cerebrum is the center of intelligence and 
 
 Fin. 
 
 Pigeon from which the Cerebrum has been removed. 
 
 thought. Pigeons from which it is removed fall into 
 a profound stupor, occasionally opening their eyes 
 with a vacant stare, and then relapsing into apathy. 
 The Cerebellum lies below the cerebrum, and in 
 the back part of the head (Fig. 42). It is about the 
 size of a small fist. Its structure resembles that of 
 the brain proper, but instead of wrinkles it has par- 
 allel ridges, which, letting the gray matter down 
 deeply into the white matter within, give it a peculiar 
 appearance, called the arbor-vitce, or tree of life 
 
THE SPINAL COED. 119 
 
 (Fig. 47). This part of the brain controls the volun- 
 tary muscles. Pigeons from which it is removed 
 
 Fig. 
 
 Pigeon from which the Cerebellum has been remoced. 
 
 are excited, nervous, and try to escape with uncer- 
 tain, sprawling movements. 
 
 The Spinal Cord occupies the cavity of the back- 
 bone. It is protected by the same membranes as the 
 brain, but, unlike it, the white matter is on the 
 outside, and the gray matter is within. Deep fis- 
 sures separate it into halves (Fig. 42), joined by a 
 bridge of the same substance. Just as it starts from 
 the brain, there is an expansion called the medulla 
 oblongata (Fig. 47). 
 
 The Nerves are glistening, silvery threads, com- 
 posed, like the spinal cord, of white matter without 
 and gray within. They go to all parts of the body, 
 and though often very near each other, yet are per- 
 fectly distinct, each conveying its own impression. 
 
120 THE NERVOUS SYSTEM. 
 
 Experiment. Press two fingers together, and, closing the eyes, let 
 some one pass the point of a pin lightly from one to the other ; you will be 
 able to tell which is touched, yet if the nerves came in contact with each 
 other anywhere in their long route to the brain, you could not thus distin- 
 guish. 
 
 Those nerves which carry the orders of the mind 
 to the different organs are called the motory nerves ; 
 those which bring back information are styled sen- 
 sory nerves. If the sensory nerve leading to any part 
 be cut, all sensation in that spot will be lost, while 
 motion will remain ; if the motory nerve be cut, all 
 motion will be destroyed, while sensation will exist. 
 
 Transfer of Pain. Strictly speaking, pain is not in 
 any organ, but in the mind, since only that can feel. 
 When any nerve brings to the brain news of an in- 
 jury, the mind locates the pain at the end of the 
 nerve. A familiar illustration is seen in the "funny 
 bone" behind the elbow. Here the nerve (ulnar) 
 gives sensation to the third and fourth fingers, in 
 which, if this bone be struck, the pain will seem to be. 
 Long after a limb has been amputated, it will still 
 seem to give pain, any injury in the stump being 
 referred to the point to which the nerve formerly led. 
 
 The nerves are divided into three general classes 
 the spinal, the cranial, and the sympathetic. 
 
 The Spinal Nerves, of which there are thirty-one 
 pairs, issue from the spinal cord through openings 
 provided for them in the backbone. Each nerve 
 arises by two roots the motory, and the sensory. 
 These roots are soon bound together in one sheath, 
 though they retain their special functions. When 
 the sensory root of a spinal nerve is cut, the animal 
 
THE SPINAL NERVES. 121 
 
 loses the power of feeling, and when the motory root 
 is cut, that of motion. 
 
 Fig. W. 
 
 A, posterior (sensory) root of a spinal nerve ; E, gang/.ioii ; B, anterior (motory 
 root ; D, spinal nerve. The white portions of the figure represent the white fibers ; and 
 the dark, the gray. 
 
 The Cranial Nerves, twelve pairs in number, 
 spring from the lower part of the brain and the 
 medulla oblongata. (See Fig. 47.) 
 
 1. The olfactory, or first pair of nerves, ramify through the nostrils, 
 and are the nerves of smell. 
 
 2. The optic, or second pair of nerves, pass to the eyeballs, and are 
 the nerves of vision. 
 
 3. 4, 6. The motores oculi (eye-movers) are three pairs of nerves used 
 to move the eyes. 
 
 5. The tri-f octal, or fifth pair of nerves, divide each into three branches 
 hence the name : the first to the upper part of the face, eyes, and nose ; 
 the second to the upper jaw and teeth ; the third to the lower jaw and the 
 mouth, where it forms the nerve of taste. These nerves are implicated 
 when we have the toothache or neuralgia. 
 
 7. The facial, or seventh pair of nerves, are distributed over the face, 
 and give it expression. 
 
 8. The auditory, or eighth pair of nerves, go to the ears, and are the 
 nerves of hearing. 
 
 9. The glos-so-pha-ryn 1 -ge-al, or ninth pair of nerves, are distributed 
 over the mucous membrane of the pharynx, tonsils, etc. 
 
 10. The pncu-mo-gas' -trie, or tenth pair of nerves, preside over the 
 larynx, lungs, and stomach, one branch extending to the heart. This is 
 the only nerve that goes so far from the head. 
 
 11. The accessory, or eleventh pair of nerves, regulate the vocal move- 
 ments of the larynx. 
 
 12. The hyp-o-glos' -sal, or twelfth pair of nerves, give motion to the 
 tongue. 
 
 The Sympathetic System contains the nerves of 
 organic life. It consists of a double chain of ganglia 
 
122 
 
 THE NERVOUS SYSTEM. 
 
 on either side of the backbone, extending into the 
 chest and abdomen. From these, delicate nerves 
 
 Fin 1,7. 
 
 The Brain and the origin of the twelve pairs of Cranial Nerves. F, E, the Cere- 
 brum ; D, the cerebellum, showing the arbor-vitce ; G, the eye ; H, the medulla ob- 
 longata; A, the spinal cord ; C and B, the first two pairs of spinal nerves. 
 
 run to the organs on which life depends the heart, 
 lungs, stomach, etc., to the blood-vessels, and to the 
 spinal and cranial nerves over the body. Thus the 
 entire system is bound together by cords of sym- 
 pathy, so that, " if one member suffers, all the mem- 
 bers suffer with it." 
 
 Crossing of Cords. Each half of the body is pre- 
 sided over, not by its own half of the brain, but that 
 of the opposite side. (1) The motory nerves, as they 
 descend from the brain, in the medulla oblongata 
 cross each other and pass to the opposite side of the 
 spinal cord. So the motor-nerves of the right side 
 
REFLEX ACTION. 
 
 123 
 
 of the body are connected with t-he left side of the 
 brain, and vice versa. Thus a derangement in one 
 
 Spinal Nerves, Sympathetic Cord, and the Net-work of Sympathetic Nerves around 
 the Internal Organs. K, aorta ; A, cesophagus ; B, diaphragm : C, stomach. 
 
 half of the brain paralyzes the opposite half of the 
 body. (2) Each of the sensory fibers of the spinal 
 nerves crosses over to the opposite side of the spinal 
 cord, and so ascends to the brain. 
 
 An injury to the spinal cord may, therefore, cause 
 a loss of motion in one leg and of feeling in tho 
 other. 
 
 Reflex Action. We have seen that nervous 
 force arises in the gray matter. A ganglion, there- 
 fore, can not only receive an impression, but can 
 
124 THE NERVOUS SYSTEM. 
 
 also send it back, i. e., reflect it, so as to excite the 
 muscles to action. This is done without reference to 
 the mind. We wink involuntarily at a flash of light 
 or a threatened blow ; we start at a sudden sound ; 
 we jump back from a precipice before the mind has 
 time to reason upon the danger. Thus, the spinal 
 cord conducts certain impressions to the brain, but 
 responds to others without troubling that organ. 
 
 Uses of Reflex Action. We breathe eighteen 
 times every minute; we stand, walk, eat, digest, 
 and, at the same time, carry on a train of thought, 
 all without a consciousness of effort. Our brain is 
 thus freed from the petty detail of life. If we were 
 obliged to attend to every breath, every pulsation of 
 the heart, every wink of the eye, our time would be 
 wasted in keeping alive. Besides, an act which at 
 first is difficult, soon grows easy, and, at last, be- 
 comes mechanical, i. e., reflex. All the possibilities 
 of education and the power of forming habits are 
 based upon this principle. No act we perform ends 
 with itself. It leaves behind it in the nervous cen- 
 ters a tendency to do the same thing again. Our 
 physical being thus fixes upon us the habits of a 
 good or an evil life. Our very thoughts, even, are 
 written in our muscles, so that not only the expres- 
 sion of our face, but our features themselves betray 
 our hidden life. Nature is intent upon hanging out 
 sign-boards to show what kind of a person ; we are. ' 
 
 Brain Exercise. The nervous system demands 
 activity. The mind grows by what it feeds on. 
 Hence, the girl who lolls on the sofa, reading roman- 
 tic novels, or who devotes her life to fashionable 
 
SLEEP. 125 
 
 follies, will physically and mentally weaken ; while 
 the boy who idles about the streets, smoking cigar- 
 ettes, and who reads only tales of crime and adven- 
 ture, may be equally sure of mental poverty and 
 bodily weakness. On the other hand, excessive 
 study exhausts the vital force, and the weakened 
 body, reacting on the brain, produces gradual decay 
 and serious disease. 
 
 Sleep is as essential as food. During the day, the 
 process of tearing-down goes on ; during the night, 
 the work of building-up should make good the loss. 
 In youth more sleep is needed than in old age. The 
 number of hours required must be decided by each 
 person ; Napoleon took only five hours, but most 
 people need from six to eight hours, brain-workers 
 even more. In general, one should sleep until he 
 naturally wakes. 
 
 Sleep produced by medicine is rarely as beneficial as natural sleep, for the 
 disturbance to the nervous system often counterbalances the good results 
 of slumber. The habit of acquiring sleep in this way, without the advice 
 of a physician, is extremely dangerous, as the dose must be constantly in- 
 creased to cause the effect ; where laudanum or morphine is used, the 
 person often falls, unawares, into a terrible and fatal bondage. Infants, 
 especially, should never be dosed with cordials. Frightful injury is heaped 
 on helpless childhood by the reckless use of soothing- syrups. All ordinary 
 sleeping-draughts have life-destroying properties, as is proved by the fatal 
 effects of an overdose. At the best, they paralyze the nerve centers, dis- 
 order the digestion, and poison the blood. 
 
 Sunlight has a marked effect upon the nervous 
 system. All vigor and activity come from the sun. 
 Vegetables grown in subdued light have a bleached 
 and faded look. An infant kept in absolute dark- 
 
126 THE NERVOUS SYSTEM. 
 
 ness would grow into a shapeless idiot. That room 
 is the healthiest to which the sun has the freest 
 access. Epidemics frequently attack the inhabitants 
 of the shady side of a street, and totally exempt 
 those on the sunny side. If, on a slight indisposi- 
 tion, we should go out into the open air and bright 
 sunlight, instead of shutting ourselves up in a close, 
 dark chamber, we might often avoid a serious ill- 
 ness. The sun-bath is an efficient remedy for many 
 diseases. Our window blinds and curtains should be 
 thrown open, and we should let the blessed air and 
 sun stream in to invigorate and cheer. No house 
 buried in shade, and no room with darkened win- 
 dows, is fit for human habitation. In damp and 
 darkness, lies in wait almost every disease to which 
 flesh is heir. The sun is their only successful foe. 
 
 Wonders of the Brain. After having seen the 
 beautiful contrivances and the exquisite delicacy of 
 the lower organs, it is natural to suppose that when 
 we come to the brain we should find the most elabo- 
 rate machinery. How surprising, then, it is to have 
 revealed to us only cells and fibers ! The brain is 
 the least solid and most unsubstantial looking organ 
 in the body. Eighty per cent, of water, seven of 
 albumen, some fat, and a few minor substances 
 make up the instrument which rules the world. 
 Strangest of all, the brain, which is the seat of 
 sensation, is itself without sensation. Every nerve, 
 every part of the spinal cord, is keenly alive to the 
 slightest touch, yet "the brain may be cut, burned, 
 or electrified without producing pain." 
 
ALCOHOLIC DRINKS AND NARCOTICS. 12? 
 
 ALCOHOLIC DRINKS AND NARCOTICS. 
 
 ALCOHOL (Continued from p. 113). 
 
 Effect upon the Nervous System. When a person 
 takes alcohol into his stomach, its influence upon the 
 nervous system is marked by four successive stages. 
 
 1. THE STAGE OF EXCITEMENT. The first effect, as 
 we have already seen, is to paralyze the nerves that 
 regulate the passage of the blood through the capil- 
 laries. The vital force, thus drawn into the nervous 
 centers, drives the machinery of life with tremendous 
 energy. The blood surges through the body with 
 increased violence. Every capillary tube in the sys- 
 tem is swollen and flushed, like the reddened nose 
 and cheek. 
 
 In all this there is excitement, but no nourishment, 
 no permanent power conferred on brain or muscle. 
 Alcohol may cheer for the moment. It may set the 
 sluggish blood in motion, start the flow of thought, 
 and excite a temporary gayety. " It may enable a 
 wearied or feeble organ to do brisk work for a 
 short time. It may make the brain briefly brilliant. 
 It may excite muscle to quick action, but it does 
 nothing at its own cost, fills up nothing it has de- 
 stroyed, and itself leads to destruction." Even the 
 mental activity it excites is an unsafe state of mind, 
 for that even balance of the faculties so essential to 
 good judgment is disturbed by the presence of the 
 intruder. Johnson well remarked, "Wine improves 
 conversation by taking the edge off the understand- 
 ing." 
 
128 THE NERVOUS SYSTEM. 
 
 2. THE STAGE OF MUSCULAR WEAKNESS. If the ac- 
 tion of the alcohol be still continued, the spinal cord 
 is next affected by this powerful narcotic. The con- 
 trol of some of the muscles is lost. Those of the 
 lower lip usually fail first, then those of the lower 
 limbs, and the staggering, uncertain steps betray the 
 result. The muscles themselves, also, become feebler 
 as the power of contraction diminishes. The tem- 
 perature, which, for a time, was slightly increased, 
 soon begins to fall as the heat is radiated ; the body 
 is cooled, and the well-known "alcoholic chill" is 
 felt. 
 
 3. THE STAGE OF MENTAL WEAKNESS. The cere- 
 brum is now affected. The ideal and emotional fac- 
 ulties are quickened, while the will is weakened. 
 The center of thought being overpowered, the mind 
 is a chaos. Ideas flock in thick and fast. The tongue 
 is loosened. The judgment loses its hold on the acts. 
 The reason giving way, the animal instincts gener- 
 ally assume the mastery of the man. The hidden 
 nature comes to the surface. All the gloss of educa- 
 tion and social restraint falls off, and the lower 
 nature stands revealed. The coward shows himself 
 more craven, the braggart more boastful, the bold 
 more daring, and the cruel more brutal. The inebri- 
 ate is liable to commit any outrage that the slightest 
 provocation may suggest. 
 
 4. THE STAGE OF UNCONSCIOUSNESS. At last, 
 prostration ensues, and the wild, mad revel of the 
 drunkard ends with utter senselessness. In common 
 speech, the man is " dead drunk." Brain and spinal 
 cord are both benumbed. Fortunately, the two nerv- 
 
EFFECT UPON THE BRAIN. 129 
 
 ous centers which supply the heart and the dia- 
 phragm are the slowest to be influenced. So, even 
 in this final stage, the breathing and the circulation 
 still go on, though the other organs have stopped. 
 Were it not for this, every person thoroughly intoxi- 
 cated would die. (Richardson.) 
 
 Effect upon the Brain. Alcohol seems to have a 
 special affinity for the brain. This organ absorbs 
 more than any other, and its delicate structure is 
 correspondingly affected. The congestion here 
 reaches its height. The tiny vessels become clogged 
 with blood that is loaded with carbonic acid, and 
 scantily supplied with the life-giving oxygen. (Hin- 
 ton.) The mind slowly rallies from the stupor of the 
 fourth stage, and a lingering sense of dullness and 
 depression shows with what difficulty the fatigued 
 brain recovers its usual condition. So marked is 
 the effect of the narcotic poison that some authorities 
 hold that " a once thoroughly-intoxicated brain 
 never fully becomes what it was before." 
 
 The deadening of the nerves, which occurs even 
 in the first stage, is full of peril. Pain is said to be 
 " the cry of the body for healthy blood." Whenever 
 anything goes amiss in any part of the system, a 
 despatch is sent at once to the brain, and we feel 
 uneasy, often miserable, till the cause is removed. 
 Alcohol deadens this " physical conscience," and its 
 unfortunate victim goes on ruining his health with- 
 out knowing it. 
 
 In time, the free use of liquor hardens and thickens 
 the membranes which envelop the nervous matter ; 
 the nerve-cells undergo a " fatty degeneration" ; the 
 
130 THE NERVOUS SYSTEM. 
 
 blood-vessels, from long congestion, lose their elastici- 
 ty; and the vital fluid, flowing less freely through the 
 obstructed channels, fails to afford the old-time nour- 
 ishment. The consequent decay of the nervous sub- 
 stance shows itself in the weakened mind we so 
 often notice in a person accustomed to drink, and at 
 last results in various nervous disorders epilepsy, 
 paralysis, and insanity. The law of heredity here 
 asserts itself again, and the inebriate's children often 
 inherit the disease which he has escaped. 
 
 Chief among the consequences of this imperfect 
 nutrition of the brain is that state between intoxica- 
 tion and insanity, known as Delirium Tremens. 
 " It is marked by a restless activity of the cerebrum, 
 manifesting itself in muttering delirium, with occa- 
 sional violent paroxysms. The victim apprehends 
 some direful calamity ; he imagines his bed to be 
 covered with loathsome reptiles ; he sees the walls 
 of his apartment crowded with foul specters ; and 
 he imagines his friends and attendants to be fiends 
 come to drag him down to a fiery abyss beneath. "- 
 (Carpenter.) 
 
 Influence upon the Mental and Moral Powers. 
 The effect of alcoholized blood is to weaken the will. 
 The one habitually under its influence often shocks 
 us by his indecision and broken promises of reform. 
 The truth is, he has lost, in a measure, his power of 
 self-control. At last, he becomes physically unable 
 to resist the craving demand of his morbid appetite. 
 
 Other faculties share in this mental wreck. The 
 intellectual vision becomes less penetrating, the 
 grasp of thought is less vigorous, and the decisions 
 
ALCOHOL. 131 
 
 of the mind are less reliable. A thriftless, reckless 
 feeling is developed, and all self-respect is lost. 
 
 Along with this mental degradation comes also a 
 failure of the moral sense. The fine fiber of charac- 
 ter undergoes a "degeneration" as certain as that 
 of the muscles themselves. The broken promises 
 tell of a lowered standard of truth and a dulled sense 
 of honor, quite as much as of an impaired will. 
 Conscience is lulled to rest. Reason is enfeebled. 
 Customary restraints are thrown off. The sensibili- 
 ties are blunted. There is less ability to appreciate 
 nice shades of right and wrong. Great moral prin- 
 ciples and motives lose their power to influence. The 
 better nature has been dethroned. 
 
 The wretched victim of appetite will now gratify 
 his passion for drink at any expense of deceit or 
 crime. He becomes the blind instrument of his 
 insane impulses, and commits acts from which he 
 would once have shrunk with horror. Sometimes he 
 even takes a malignant pleasure in injuring those 
 whom Nature has ordained he should protect. 
 
 Summary. Richardson sums up the various diseases caused by alcohol 
 as follows : ' ' (a). Diseases of the brain and nervous system, indicated 
 by such names as apoplexy, epilepsy, paralysis, vertigo, softening of the 
 brain, delirium tremens, dipsomania or inordinate craving for drink, loss 
 of memory, and that general failure of the mental power, called dementia. 
 (b). Diseases of the lungs : one form of consumption, congestion, and sub- 
 sequent bronchitis. (c). Diseases of the heart : irregular beat, feeble- 
 ness of the muscular walls, dilatation, disease of the valves, (d). Diseases 
 of the blood : scurvy, excess of water or dropsy, separation of fibrin, (e). 
 Diseases of the stomach : feebleness of the stomach, indigestion, flatulency, 
 irritation, and sometimes inflammation. (/ ). Diseases of the bowels : 
 relaxation or purging, irritation. (g). Diseases of the liver : congestion, 
 
132 THE NERVOUS SYSTEM. 
 
 hardening and shrinking, cirrhosis, (h}. Diseases of the kidneys : change 
 of structure into fatty or waxy-like condition and other results leading to 
 dropsy, or sometimes to fatal sleep. (i). Diseases of the muscles ; fatty 
 change in the muscles, by which they lose their power for proper active 
 contraction, (j}. Diseases of the membranes of the body : thickening and 
 loss of elasticity, by which the parts wrapped up in the membiane are im- 
 paired for use, and premature decay is induced." 
 
 II. TOBACCO. 
 
 The Chief Constituents of Tobacco are car- 
 bonic acid, carbonic oxide, and ammonia gases ; 
 carbon, or soot ; and nicotine. Carbonic acid tends 
 to produce sleepiness and headache. Carbonic oxide, 
 in addition, causes a tremulous movement of the 
 muscles, and so of the heart. Ammonia bites the 
 tongue of the smoker, excites the salivary glands, 
 and causes dryness of the mouth and throat. Nico- 
 tine is a powerful poison. The amount contained in 
 one or two strong cigars, if thrown directly into the 
 blood, would cause death. 
 
 Physiological Effects. The poison of tobacco, set 
 free by the process either of chewing or smoking, 
 when for the first time swept through the system by 
 the blood, powerfully affects the body. Nausea is 
 felt, and the stomach seeks to throw off the offending 
 substance. The brain is inflamed, and headache 
 follows. The motor-nerves becoming irritated, gid- 
 diness ensues. Thus Nature earnestly protests 
 against the formation of this habit. But, after 
 repeated trials, the system adjusts itself to the new 
 conditions. Such powerful substances cannot, how- 
 ever, be constantly inhaled without producing 
 marked changes. The three great eliminating 
 
ALCOHOL. 133 
 
 organs the lungs, the skin, and the kidneys throw 
 off a large part of the products, but much remains in 
 the system. When the presence of the poison is 
 constant, and especially when smoking or chewing 
 is excessive, the temporary disturbance leads to 
 chronic derangement. 
 
 In this, as in the case of other injurious articles of 
 diet, the strong and healthy sometimes seem to es- 
 cape entirely, while the weak and those predisposed 
 to disease suffer according to the extent of the in- 
 dulgence. Those who lead an active, outdoor life 
 often show no sign of nicotine poisoning, but the 
 man of sedentary habits will sooner or later be the 
 victim of dyspepsia, sleeplessness, nervousness, paral- 
 ysis, or some other organic difficulty. Here, again, 
 the law of heredity asserts itself, and though the 
 tobacco-user himself escapes, his innocent offspring 
 only too often inherit an impaired constitution, and 
 a tendency to nervous disease. 
 
 The Various Disturbances produced in different individuals and 
 constitutions by smoking have been summed up by Dr. Richardson as fol- 
 lows : " (a) In the blood, it causes undue fluidity, and change in the red 
 corpuscles ; (6) in the stomach, it gives rise to debility, nausea, and vom- 
 iting ; (c) in the mucous membrane of the mouth, it produces enlargement 
 and soreness of the tonsils smoker's sore-throat redness, dryness, and 
 occasional peeling of the membrane, and either unnatural firmness and con- 
 traction, or sponginess of the gums ; and, where the pipe rests on the lips, 
 oftentimes ' epithelial cancer ; ' (d) in the heart, it causes debility of the 
 organ, and irregular action ; (e) in the bronchial surface of the lungs, when 
 that is already irritable, it sustains irritation, and increases the cough ; (/) 
 in the organs of sense, it produces dilation of the pupils of the eye, con- 
 fusion of vision, bright lines, luminous or cobweb specks, and long reten- 
 tion of images on the retina, with analogous symptoms affecting the ear, 
 
134 THE NERVOUS SYSTEM. 
 
 viz. : inability to define sounds clearly, and the occurrence of a sharp, ring- 
 ing noise like a whistle ; (g) in the brain, it impairs the activity of the 
 organ, oppressing it if it be nourished, but soothing it if it be exhausted ; 
 (h) it leads to paralysis in the motor and sympathetic nerves, and to over- 
 secretion from the glands which the sympathetic nerves control." 
 
 CIGARETTES are especially injurious from the irritating smoke of the paper 
 covering, and also because the poison-fumes of the tobacco are more directly 
 inhaled. In the cheap cigarettes often smoked by boys, the ingredients are 
 harmful, while every youth would revolt if he knew what filthy materials, 
 refuse cigar-stumps, &c. , are used in their manufacture. 
 
 Is Tobacco a Food? Tobacco cannot impart to 
 the blood an atom of nutritive matter for building up 
 the body. It does not add to, but rather subtracts 
 from, the total vital force. It confers no power upon' 
 muscle or brain. It stimulates by cutting off the 
 nervous supply from the extremities and concentra- 
 ting it upon the centers. But stimulation is not 
 nourishment ; it is only a rapid spending of the cap- 
 ital stock. There is no greater error than to mistake 
 the exciting of an organ for its strengthening. 
 
 The Influence upon Youth. Here, too, science and 
 experience assert only one conviction. Tobacco re- 
 tards the development of mind and body. The law 
 of nature is that of steady growth. It cannot admit 
 of a daily disturbance that weakens the digestion, 
 that causes the heart to labor excessively, that pre- 
 vents the perfect oxidation of the blood, that inter- 
 feres with the digestion, and that deranges the ner- 
 vous system. No one has a right thus to check and 
 disturb his physical and mental progress. Hence, the 
 young man (especially if he be of a nervous, sensitive 
 organization) who uses tobacco diminishes the pos- 
 sible energy with which he might commence the 
 
OPIUM. 135 
 
 work of life ; while he comes under the bondage of a 
 habit that may become stronger than his will, and 
 under the influence of a narcotic that may beguile 
 his faculties and palsy his strength at the very mo- 
 ment when every power should be awake. 
 
 Another peril lies in the wake of this masterful 
 poison-habit. Tobacco causes a thirst and depression 
 that only too often lead to the use of liquor. 
 
 III. OPIUM. 
 
 Opium is the dried juice of the poppy. In Eastern 
 countries, this flower is cultivated in immense fields. 
 When a cut is made in the poppy-head, a tiny tear of 
 milky juice exudes, and hardens. These little drops 
 are gathered and prepared for the market. Through- 
 out the East, opium is generally smoked; but in 
 Western countries, it is taken usually in the form of 
 laudanum, paregoric, and morphine. The drug itself 
 is also eaten. 
 
 Physiological Effect. Opium, in its various forms, 
 acts directly upon the nerves, a small dose quieting 
 pain, and a larger one soothing to sleep. It arouses 
 the brain, and fires the imagination to a wonderful 
 pitch. The reaction from this unnatural excitant 
 is correspondingly depressing ; and the " overwhelm- 
 ing horror " that ensues, calls for a renewal of the 
 stimulus. The dose must be gradually increased to 
 produce the original effect, and must be taken at the 
 habitual hour, no matter what the circumstances, 
 under the penalty of almost unendurable agony. 
 
 The seductive nature of this drug leads on its un- 
 fortunate victim step by step, until he finds himself 
 
136 THE NERVOUS SYSTEM. 
 
 fast bound in the fetters of the most tyrannical habit 
 known to man. To continue, is to wreck all one's 
 powers physical and mental ; to stop, requires a 
 strength of will that few possess. Even when the 
 habit is broken, the system is long in recovering from 
 the shock. Opium seems to be the foe of every 
 organ. The digestion is weakened, the appetite is 
 lost, the muscles waste, the skin shrivels, the ner- 
 vous centers are paralyzed, and a premature^ old age 
 comes on apace. 
 
 No person can be too careful in the use of laudanum, 
 paregoric, and morphine. They should never be 
 taken except on a physician's prescription. If fol- 
 lowed up for any length of time, the habit may be 
 formed ere one is aware. Then comes the opium- 
 eater's grave, or the opium-eater's struggle for life ! 
 
 Many persons learn to inject morphine beneath the skin by means of a 
 "hypodermic syringe." The operation is painless, and seems innocent 
 enough. It throws the narcotic directly into the circulation, and relief 
 from pain almost instantly follows. But the danger of forming the opium 
 habit is not lessened, and the effect of using the drug in this form for a long 
 time is just as injurious as opium-smoking itself. 
 
 IV. CHLORAL HYDRATE. 
 
 Chloral Hydrate is a drug frequently used to cause 
 sleep. It leaves behind no headache or lassitude, as 
 is often the case with morphine. It is, however, a 
 treacherous remedy. Even a small and harmless 
 dose, persisted in for a long period, may produce a 
 gradual accumulation of evil results that in the end 
 will prove fatal. 
 
 The Physiological Effect is very marked. The 
 
CHLOROFORM. 137 
 
 appetite becomes capricious. The secretions are un- 
 natural. Nausea often ensues. Then the nervous 
 system is involved. The heart is affected. Sleep is 
 broken. Finally the blood becomes unduly fluid, as 
 it does in the case of persons deprived of fresh food. 
 A disease resembling scurvy follows, and the skin 
 breaks out in unsightly blotches. 
 
 V. CHLOROFORM. 
 
 Chloroform is a powerful anaesthetic. It is some- 
 times prescribed by a physician, and afterward (as in 
 the case of laudanum, morphine, and chloral) the 
 sufferer, charmed with the release from pain and the 
 peaceful slumber secured, buys the dangerous drug 
 for himself. Its use soon becomes an apparent neces- 
 sity. As with opium, the craving for the narcotic 
 at a stated time is almost irresistible. If it be with- 
 held, the half -frantic patient will demand, entreat, 
 pray for another dose, in a manner never to be for- 
 gotten. Paleness and debility, the earliest symp- 
 toms, are followed by mental prostration. Famili- 
 arity with the dangerous drug begets carelessness. 
 Its victims are frequently found dead in their beds, 
 with the handkerchief from which they inhaled the 
 volatile poison clutched in their lifeless hands. 
 
 PRACTICAL QUESTIONS. 
 
 1. Why is the pain of incipient hip-disease frequently felt in the knee ? 
 
 2. Why does a child require more sleep than an aged person ? 
 
 3. When you put your finger in the palm of a sleeping child, why will 
 he grasp it ? 
 
 4. How may we strengthen the brain ? 
 
138 
 
 THE NERVOUS SYSTEM. 
 
 5. What is the object of pain ? 
 
 6. Why will a blow on the stomach sometimes stop the heart ? 
 
 7. Why can an idle scholar read his lesson and at the same time count 
 the marbles in his pocket ? 
 
 8. How can we grow beautiful ? 
 
 9. Why do intestinal worms ever affect a child's sight ? 
 
 10. Is there any indication of character in physiognomy ? 
 
 11. When one's finger is burned, where is the ache ? 
 
 12. Why can we walk and talk at the same time ? 
 
 BLACKBOARD ANALYSIS. 
 
 1. THE STRUCTURE. 
 
 THE NERVOUS SYSTEM. 
 
 2. ORGANS OF THE NER- 
 vous SYSTEM. 
 
 3. HYGIEKE . -< 
 
 ( (1. Description. 
 1. The brain < 2. The Cerebrum. 
 ( 3. The Cerebellum. 
 
 9 Tho <Jr,ina1 rW/1 j * ItS Composition. 
 
 2. The Spinal Cord... -j 2 Medulla oblongata. 
 
 ( 1. Description. 
 2. Motor* and Sensory. 
 | 3. Transfer of Pain. 
 1 4. The Spinal Nerves. 
 3. The Nerves .... -i. 5 The Cranial Nerves 
 
 1 6. Sympathetic System. 
 7. Crossing of Cords. 
 1 8. Reflex Action. 
 ^ 9. Uses of Reflex Action. 
 
 '1. Brain Exercise. 
 2. Brain-growth and Body-growth. 
 3. Sleep. 
 4. Effect of Sleeping-draughts. 
 V 5. Sunlight. 
 
 or. 
 
 o--.- r 
 
 g? | 1. Effect upon the Nervous System. 
 o "g -^ 2. Effect upon the Brain. 
 <S g | 3. Efl'ect upon Mental and Moral Powers. 
 
 c f 1. Constituents of Tobacco. 
 g 2. Physiological Effects. 
 ^ J 3. Influence upon the Nervous System. 
 c ""j 4. Disturbances produced by smoking 
 ^ j 5. Is Tobacco a Food ? 
 d ^ 6. Influence of Tobacco upon Youth. 
 
 3. Opium. 
 
 4. Chloral Hydrate. 
 5. Chloroform. 
 
 4. WONDERS OF THE BRA 
 
 5. ALCOHOLIC DRINKS, 
 AND NARCOTICS. -\ 
 
 i 
 
THE SPECIAL SENSES. 
 
 1. TO UGH. 
 
 DESCRIPTION. Touch is sometimes called the 
 " common sense," since its nerves are spread 
 over the whole body. It is most delicate, however, 
 in the point of the tongue and the tips of the fingers. 
 The surface of the cutis is covered with minute pro- 
 jections called papillce (Fig. 20). Each of these con- 
 tains its tiny nerve-twigs, that receive the impression 
 and send it to the brain. 
 
 Experiment. With a pocket-lens, examine the palm of the hand, 
 where there are at least 12,000 papillae in a square inch, and note the fine 
 ridges along which they are arranged. 
 
 Uses. Touch is the first of the senses used by a 
 child. By it we obtain our idea of solidity, and also 
 correct the impressions made upon us by the other 
 senses. Thus, when we see anything curious, our 
 first desire is to handle it. The sensation of touch is 
 generally relied upon, yet it is easily deceived. 
 
 Experiments. 1. Hold a marble in the manner shown in Fig. 49. 
 It will seem like two marbles. 2. Touch the fingers thus crossed to your 
 tongue. You will feel two tongues. 3. Close your eyes and let another 
 
140 THE SPECIAL SENSES. 
 
 person move one of your fingers over a plane surface, first lightly, then 
 with greater pressure, and then lightly again. You will think the surface 
 
 This sense is capable of wonderful cultivation, and 
 the delicacy of touch possessed by the blind almost 
 compensates the loss of their eyes. The sympathy 
 
 Fig. 
 
 between all the different organs shows how they 
 combine to make a home for the mind. When one 
 sense fails, the others try to remedy the defect. It 
 is touching to see how the blind man gets along 
 without eyes, and the deaf without ears. Cuthbert, 
 though blind, was the best polisher of telescopic 
 mirrors in London. There is an instance recorded 
 of a blind man who could recognize colors. The 
 author knew one who said he could tell when he was 
 approaching a tree, " by the different feeling of the 
 air." 
 
 2. TASTE. 
 
 Description. This sense is located in the papillae 
 of the tongue and palate. 
 
 Experiment. Put a drop of vinegar on another person's tongue, or 
 on your own before a mirror, and notice how the papillae rise. 
 
TASTE. 
 
 141 
 
 The velvety look of the tongue is given by hair- 
 like projections of the cuticle upon some of the 
 papillae. They absorb the liquid to be tasted, and 
 convey it to the nerves. A substance that will not 
 dissolve is tasteless. 
 
 The back of the tongue is most sensitive to salt 
 
 Fig. 50. 
 
 The Tongue, showing the three kinds of Papilla the conical (D), the whip-like (K 
 I), the circumvallate or entrenched (H, L) ; E, F, G, nerves ; C, glottis. Lankester. 
 
 and bitter tastes, and, as this part is supplied by the 
 ninth pair of nerves (Fig. 47), which is in sympathy 
 
142 THE SPECIAL SENSES. 
 
 with the stomach, such flavors often produce vomit- 
 ing. The edges of the tongue are most sensitive to 
 sweet and sour substances, and, as this part is sup- 
 plied by the fifth pair of nerves, which also goes to 
 the face, an acid distorts the countenance. 
 
 The Use of the Taste was originally to guide in 
 the selection of food ; but it has become so depraved 
 by condiments and habit that it would be difficult to 
 tell what are one's natural tastes. 
 
 Fin. 51. 
 
 A, b, c, d, interior or the nose, which ii lined by a mucous membrane ; n, tne nose ; 
 e the wing of the nose : q, the nose bones; o, the upper lip; g, section of the vpptr 
 jaw-bone; h, the upper part of the mouth, or hard palate ; m, frontal bone of the 
 skull ; k, the ganglion or bulb of the olfactory nerve in the skull, from uhich are seen 
 the branches of the nerve passing in all directions. 
 
 3. SMELL. 
 
 Description. The olfactory nerves (first pair, Fig. 
 47) enter through a sieve-like, bony plate at the roof 
 
HEARING. 
 
 143 
 
 of the nose, and are distributed over the inner sur- 
 face of the two olfactory chambers. The object to 
 be smelled need not touch the nose, but tiny particles 
 borne on the air enter the nasal passages. 
 
 The Uses of the sense of smell are to guide us in 
 the choice of our food, and to warn us against bad 
 air, and unhealthy localities. 
 
 4. HEARING. 
 Fig. 52. 
 
 The Ear. 
 
 Description. The ear is divided into the external, 
 middle, and internal ear. 
 
 1. THE EXTERNAL EAR is a sheet of cartilage 
 curiously folded for catching sound. The auditory 
 canal, B, or tube of this ear-trumpet, is about an 
 inch long. Across the lower end is stretched the 
 membrane of the tympanum or drum, which is kept 
 soft by a fluid wax. 
 
144 THE SPECIAL SENSES. 
 
 2. THE MIDDLE EAR is a cavity, at the bottom of 
 which is the Eustachian tube, Gr, leading to the 
 mouth. Across this chamber hangs a chain of three 
 singular little bones, C, named from their shape the 
 hammer, the anvil, and the stirrup. Though these 
 tiny bones weigh all together only a few grains, yet 
 they have two perfect joints, a ball-and-socket, and 
 a hinge. 
 
 3. THE INTERNAL EAR, or labyrinth, is hollowed 
 out of the solid bone. In front, is the vestibule, A, 
 about as large as a grain of wheat ; from it open 
 three semi-circular canals, D, and the winding stair 
 of the cochlea, or snail shell, E. Here expand the 
 delicate fibrils of the auditory nerve. 
 
 Floating in the liquid which fills the labyrinth is 
 a little bag containing hair-like bristles, fine sand, 
 and two ear-stones. In the cochlea are minute ten- 
 drils, named the fibers of Corti, from their discov- 
 erer. These are regularly arranged, the longest at 
 the bottom, and the shortest at the top. Could this 
 spiral plate, which coils two and a half times around, 
 be unrolled and made to stand upright, it would form 
 a beautiful microscopic harp of three thousand 
 strings. 
 
 How We Hear. Whenever one body strikes an- 
 other in the air, waves are produced, just as when 
 we throw a stone into the water a series of circles 
 surrounds the spot where it sinks. These waves of 
 air strike upon the membrane. This vibrates, and 
 sends the motion along the chain of bones in the 
 middle ear to the fluids of the labyrinth. Here 
 bristles, sand, and stones pound away, and the won- 
 
SIGHT. 145 
 
 drous harp of the cochlea, catching up the pulsa- 
 tions, carries them to the fibers of the auditory 
 nerve, which conveys them to the brain, and gives 
 the mind the idea of sound. During this process, the 
 original pulsations are mysteriously modified by the 
 bristles, ear-stones, &c., so that they can affect the 
 nerve. 
 
 Care of the Ear. The delicacy of the ear is such 
 that it needs the greatest care. Cold water should 
 not be allowed to enter the auditory canal. If the 
 wax accumulate, never remove it with a hard instru- 
 ment, lest the delicate membrane be injured, but 
 with a little warm water, after which turn the head 
 to let the water run out, and wipe the ear dry. 
 The hair around the ears should never be left wet, 
 as it may chill this sensitive organ. If an insect 
 get in the external ear, pour in a little oil to kill it, 
 and then remove with tepid water. The object of 
 the Eustachian tube is to admit air into the ear, and 
 thus equalize the pressure on the membrane. 
 
 3. SIGHT. 
 
 Description. The eye is lodged in a bony cavity, 
 protected by the overhanging brow. It is a globe, 
 about an inch in diameter. The ball is covered by 
 three coats (1) the sclerotic, d, a tough, horny casing, 
 which gives shape to the eye, the convex, trans- 
 parent part in front forming a window, the cornea, c ; 
 (2) the choroid, e, a black lining, to absorb the super- 
 fluous light ; and (3) the retina, 6, a membrane in 
 which expand fibers of the optic nerve, o. The crys- 
 
146 
 
 THE SPECIAL SENSES, 
 
 0-' 
 
 The Eye. 
 
 talline lens, a, brings th.3 rays of light to a focus on 
 the retina. Between the cornea and the crystalline 
 lens is a limpid fluid termed the aqueous humor ; 
 while the vitreous humor a transparent, jelly-like 
 liquid fills the space (h) back of the crystalline lens. 
 The pupil, k, is a hole in the colored, muscular cur- 
 tain, i, the iris (rainbow). 
 
 Experiment. Take the eye of a freshly slaughtered ox or sheep, and, 
 with a pair of scissors, clip the sclerotic half-way between the cornea and 
 the optic nerve. You can then see the choroid with its black lining, and 
 inside it the vitreous jelly with the retina spread out around it. By a 
 little force the vitreous humor and the lens set in it will come out, and you 
 will see the retina collapse into a whitish mass attached to the point where 
 the optic nerve comes in. In an ox's eye, you will see that a part of the 
 choroid resembles a mirror ; it is the same with the cat, which causes the 
 shining of her eye in the dark. 
 
THE SPECIAL SENSES. 147 
 
 The front half of the eye will show you the iris which is always black 
 at the back, whatever color the front may be, and the transparent cornea. 
 If you stick a pin into the cornea, the aqueous humor will spirt out. 
 
 Eyelids and Tears. The eyelids are close-fitting 
 shutters to screen the eye. The inner side is lined 
 with a mucous membrane that is exceedingly sensi- 
 tive, and thus aids in protecting the eye from any 
 irritating substance. The eyelashes serve as a sieve 
 to exclude the dust, and, with the lids, shield against 
 a blinding light. Just within the lashes are oil 
 glands, which lubricate the edges of the lids, and 
 
 Fig. 5k. 
 
 T-B 
 
 The Eyelashes and 
 
 prevent them from adhering to each other. The tear 
 (lachrymal) gland, 6r, is an oblong body lodged in the 
 bony wall of the orbit. It empties by several ducts 
 upon the inner surface, at the outer edge of the 
 upper eyelid. Thence the tears, washing the eye, 
 run into the lachrymal lake, D, a little basin with a 
 rounded border fitted for their reception. On each 
 side of this lake, two canals, (7, C, drain off the over- 
 plus through the duct, B, into the nose. 
 
148 
 
 THE SPECIAL SENSES. 
 
 Fig, 65. 
 
 Structure cf the Retina. In Fig. 
 55, is shown a section of the retina, 
 greatly magnified. The layer of 
 rods and cones (a, 6,) is to the eye 
 what the bristles, ear-stones, etc., 
 are to the ear, changing the vibra- 
 tions of light in somo mysterious 
 way so that they can affect the 
 nerve. The optic nerve itself is 
 insensible to light. At the point 
 where it enters the eye, there are 
 no rods and cones, and this is called 
 the blind spot. 
 
 Experiment. Hold this book directly be- 
 fore the face, and, closing the left eye, look 
 steadily with the right at the left-hand circle in 
 Fig. 56. Move the book back and forth, and a 
 point will be found where the right-hand circle 
 vanishes from sight. At that moment its light 
 falls upon the spot where the rods and cones are 
 lacking. 
 
 How We See. There is believed 
 
 Structure of Vie Retina. 
 a, the rods ; b, t/te cones ; 
 c, the nerve-granules ; d, 
 a mesh ;f, nerve-granules; 
 g, nerve-fibers: A, gan- , . . 
 
 giia : i, fibers of optic to be a kind of atmosphere, termed 
 ether, filling all space. This is in- 
 finitely more delicate than the air, and occupies its 
 
THE SPECIAL SENSES. 140 
 
 pores, as well as those of all bodies. As sound is 
 caused by waves in the air, so light is produced by 
 waves in the ether. A lamp-light, for example, sets 
 in motion waves of ether, which pass in through the 
 pupil of the eye to the retina, where the rods and 
 cones modify and then transmit the vibration through 
 the optic nerve to the brain, when the mind perceives 
 the light. 
 
 The Use of the Crystalline Lens. A convex lens 
 bends the rays of light which pass through it, so that 
 they meet at a point called the focus. 
 
 Fig. 57, 
 
 Diagram showing how an image of an object is formed upon the retina by the 
 Crystalline Lens. 
 
 Experiments. 1. Hold a common burning-glass or pocket-lens over 
 a piece of black paper under a bright, noon-day sun, and note how it brings 
 the rays to a focus. In the same way, the crystalline lens brings the rays 
 of light that enter the eye to a focus upon the retina. 2. Take a narrow 
 piece of board two feet long. Stick into it two large pins, about twelve or 
 fifteen inches apart, and not in a straight line. Look at the pins along the 
 board somewhat as you would " sight" a gun. If you fix your eye on the 
 nearer pin, you will see it distinctly, but the further one will become blurred. 
 If you look fixedly at the further one, that will become distinct, and the 
 nearer one blurred. By no effort can you make both pins perfectly distinct 
 at the same time. Now look rapidly from one to the other and see how 
 
160 
 
 THE CRYSTALLINE LBN'S. 
 
 soon your eye adjusts itself to each. The lens of a healthy eye has this 
 power of adapting itself, by changing its convexity (see Fig. 58), to near 
 and to distant objects, so as exactly to bring the rays of light which come 
 from them to a focus on the retina. 
 
 Near and Far Sight. If, however, the lens of the 
 eye be too convex, it will bring the rays to a focus 
 before they reach the retina ; if too flat, they will 
 reach the retina before coming to a focus. In either 
 
 Fig. 68. 
 
 A B 
 
 Adjustment of the Crystalline Lens. A. for far objects, and B,for near. 
 
 case, the sight will be indistinct. A more common 
 defect is in the shape of the globe of the eye, which 
 may be either flattened or elongated. In the former 
 case (see G, Fig. 59), objects at a distance can be 
 
 Fig. 59. 
 
 Diagram illustrating the position of the Retina. ft, in natural sight , G, in far 
 sight ; and C, in near sight. 
 
 seen most distinctly hence that is called far-sighted- 
 ness (presbyopia). In the latter, objects near by are 
 clearer, and hence this is termed near-sightedness 
 
CAfcE OF THE EYES. ll 
 
 (myopia). Far-sightedness is remedied by convex 
 glasses ; near-sightedness, by concave. When glasses 
 will improve the sight they should be worn ; any 
 delay will be liable to injure the eyes, by straining 
 their already impaired power. Cataract is a disease 
 in which the crystalline lens becomes opaque and 
 obscures the vision. A skilful surgeon can remove 
 the lens, or cause it to be absorbed, after which con- 
 vex glasses must be worn. 
 
 Color-Blind Persons receive only two of the three 
 elementary color-sensations (green, red, violet). They 
 are unable to distinguish between the leaves of a 
 cherry-tree and its fruit by the color of the two, and 
 see no difference between blue and yellow cloth. 
 Whittier, the poet, it is said, cannot tell red from 
 green unless in direct sunlight. Once he patched 
 some damaged wall-paper in his library by matching 
 a green vine in the pattern with one of a bright 
 autumnal crimson. Persons are often color-blind 
 without knowing it, and many railway accidents 
 have doubtless happened through an inability to 
 detect the color of the signal lights. 
 
 Care of the Eyes. The shape of the eye cannot 
 be changed by rubbing and pressing it, as many sup- 
 pose, but the sight may thus be fatally injured. 
 Children troubled by near-sightedness should not 
 lean forward at their work, as thereby the vessels 
 of the eye become overcharged with blood. They 
 should avoid fine print, and try, in every possible 
 way, to spare their eyes. Most cases of squinting 
 are caused by long-sightedness, the muscles being 
 strained in the effort to obtain distinct vision. In 
 
SIGHT. 
 
 childhood, it may be cured by a competent surgeon, 
 who will generally cut the muscle that draws the 
 eye out of place. 
 
 Even healthy eyes should never be used to read 
 fine print or by a dim light. Serious injury may 
 thus be caused. Reading upon the cars is also a 
 fruitful source of harm, as the lens, forced to adapt 
 itself to the incessantly-varying distance of the 
 page, soon becomes wearied. 
 
 Objects that get into the eye should be removed 
 before they cause inflammation ; rubbing only irri- 
 tates and increases the sensitiveness. If the eye be 
 shut for a few moments, so as to let the tears accu- 
 mulate, and the upper lid be then lifted by taking 
 hold of it at the center, the cinder or dust is often 
 washed away at once. Trifling objects can be re- 
 moved by simply drawing the upper lid as far as 
 possible over the lower one ; when the lid flies back 
 to its place, the friction will detach any light sub- 
 stance. If it becomes necessary, turn the upper lid 
 over a pencil, and the intruder may then be wiped 
 off with a handkerchief. "Eye-stones" are a popu- 
 lar delusion. When they seem to take out a cinder, 
 it is only because they raise the eye-lid, and allow 
 the tears to wash it out. No one should ever use an 
 eye-wash, except by medical advice. The eye is too 
 delicate an organ to be trifled with, and when any 
 disease is suspected, a reliable physician should be 
 consulted. This is especially necessary, since, 
 when one eye is injured, the other, by sympathy, 
 is liable to become inflamed, and perhaps be 
 destroyed. 
 
PRACTICAL QUESTIONS. 153 
 
 When reading or working, the light should be at 
 one side, and never in front. 
 
 The constant increase of defective eyesight among 
 the pupils in our schools is an alarming fact. Dr. 
 Agnew remarks that our school-rooms are fast mak- 
 ing us a spectacle-using people. Near-sightedness 
 seems to increase from class to class, until, in the 
 upper departments, there are sometimes as high as 
 fifty per cent, of the pupils thus afflicted. The 
 causes are (1), desks so placed as to make the light 
 from the windows shine directly into the eyes of the 
 scholars ; (2), cross-lights from opposite windows ; 
 (3) insufficient light ; (4), small type that strains the 
 eyes ; and (5), the position of the pupil as he bends 
 over his desk or slate, causing his blood to settle in 
 his eyes. All these causes can be remedied ; the 
 position of the desks can be changed ; windows can 
 be shaded, or new ones inserted ; books and news- 
 papers that try the eyes can be rejected ; and every 
 pupil can be taught how to sit at study. 
 
 PR/VCTICAL QUESTIONS. 
 
 1. "Why does a laundress test the temperature of her flat iron by holding 
 it near her cheek ? 
 
 2. When we are cold, why do we spread the palms of our hands before 
 the fire ? 
 
 3. What is meant by a " furred tongue " ? 
 
 4. Why has sand or sulphur no taste ? 
 
 5. What was the origin of the world palatable ? 
 
 6. How many rows of hairs are there in the eye-brows ? 
 
 7. How often do we wink ? 
 
154 THE SIGHT. 
 
 8. What is the object of the hairs in the nostrils ? 
 
 9. What use does the nose subserve in the process of respiration ? 
 
 10. Why do we sometimes hold the nose when we take unpleasant 
 medicine ? 
 
 11. Why was the nose placed over the mouth ? 
 
 1 2. Describe how the hand is adapted to be the instrument of touch. 
 
 13. Besides being the organ of taste, what use does the tongue sub- 
 serve ? 
 
 14. Why is not the act of tasting complete until we swallow ? 
 
 15. Why do all things have the same flavor when one's tongue is 
 1 ' furred " by fever ? 
 
 16. Which sense is the more useful, hearing or sight ? 
 
 17. Which coat is the white of the eye ? 
 
 18. What makes the difference in the color of eyes ? 
 
 19. Why do we snuff the air when we wish to obtain a distinct smell ? 
 
 20. Why can an elderly person drink tea which to a child would be un- 
 bearably hot ? 
 
 21. Why does an old man hold his paper so far from his eyes ? 
 
 22. Would you rather be punished on the tips of your fingers than on 
 the palm of your hand ? 
 
 BLACKBOARD 
 
 1. THE TOUCH ............ |J; Description of the Orgun. 
 
 2. THE TASTE 
 
 3. THE 
 
 ( a. External Ear. 
 ) 1. Description of the Organ ^ b. Middle Ear. 
 
 4. THE HEARING < f c. Internal Ear. 
 
 | 2. How we hear. 
 
 \3. Hygiene of the Ear. 
 
 . Description of the Organ. 
 
 2. Eyelids and Tears. 
 
 3. Structure of the Retina, 
 e T,,, Q rnTTFI , J 4. How we see. 
 
 * "< 5. The Use of the Crystalline Lens. 
 
 6. Near, and Far Sight. 
 
 7. Color-blindness. 
 
 V.8. Hygiene of the Eyei=>, 
 
CONCLUSION. 
 
 VALUE of Health. The body is the instrument 
 which the mind uses. If it be dulled or nicked, 
 the effect of the best labor will be impaired. The 
 grandest gifts of mind or fortune are comparatively 
 valueless unless there be a healthy body to use and 
 enjoy them. The beggar, sturdy and brave with his 
 out-door life, is really happier than the rich man in 
 his palace with the gout to twinge him amid his 
 pleasures. The day has gone by when delicacy is 
 considered an element of beauty. Weakness is 
 timid and irresolute ; strength is full of force and 
 energy. Weakness walks or creeps ; strength speeds 
 the race, wins the goal, and rejoices in the victory. 
 
 False Ideas of Disease. It was formerly supposed 
 that diseases were caused by evil spirits, who en- 
 tered the body and deranged its action. Incanta- 
 tions, spells, etc. , were resorted to in order to drive 
 them out. By others, disease was thought to come 
 arbitrarily, or as a special visitation of an over-ruling 
 power. Hence, it was to be removed by fasting and 
 prayer. Modern science teaches us that disease is 
 not a thing, but a state. When our food is properly 
 assimilated, the waste matter promptly excreted, 
 and all the organs work in harmonv, we are well ; 
 
156 CONCLUSION. 
 
 when any derangement of these functions occurs, 
 we are sick. Sickness is discord, as health is con- 
 cord. If we abuse or misuse any instrument, we 
 impair its ability to produce a perfect harmony. A 
 suffering body is simply the penalty of violated 
 law. 
 
 Prevention of Disease. Doubtless a large propor- 
 tion of the ills which now afflict and rob us of so 
 much time and pleasure might easily be avoided. A 
 proper knowledge and observance of hygienic laws 
 would greatly lessen the number of such diseases as 
 consumption, catarrh, gout, rheumatism, dyspepsia, 
 scrofula, etc. There are parts of England where 
 one-half the children die before they are five years 
 old. Every physiologist knows that at least nine- 
 tenths of these lives could be saved by an observance 
 of the simple laws of health. Professor Bennet, in a 
 lecture at Edinburgh, estimated that 100,000 persons 
 die annually in Great Britain from causes easily 
 preventable. 
 
 With the advance of science, the causes of many 
 diseases have been determined. Vaccination has 
 been found to prevent or mitigate the ravages of 
 small-pox. Scurvy, formerly so fatal among sailors 
 that it was deemed " a mysterious infliction of 
 Divine Justice against which man strives in vain," 
 is now entirely avoided by the use of vegetables or 
 lime-juice. Cholera, whose approach still strikes 
 dread, and for which there is no known specific, is 
 but the penalty for filthy streets, bad drainage, and 
 over-crowded tenements, and may be controlled, if 
 not prevented, by suitable sanitary measures. It 
 was, no doubt, the intention that we should wear out 
 
CURE OF DISEASE. 157 
 
 by the general decay of all the organs,* rather than 
 by the giving out of any single part, and that all 
 should work together harmoniously until the vital 
 force is exhausted. 
 
 Cure of Disease. The first step in the cure of any 
 disease is to obey the law of health which has been 
 violated. If medicine be taken, it is not to destroy 
 the disease, since that is not a thing to be destroyed, 
 but to hold the deranged action in check while na- 
 ture repairs the injury, and again brings the system 
 into harmonious movement. This tendency of na- 
 ture is our chief reliance. The best physicians are 
 coming to have diminished confidence in medicine 
 itself, and to place greater dependence upon sanitary 
 and hygienic measures, and the efforts which nature 
 always makes to repair injuries and soothe dis- 
 ordered action. They endeavor only to give her a 
 fair chance, and sometimes to assist her by the in- 
 telligent employment of proper medicines. The in- 
 discriminate use of patent nostrums and sovereign 
 remedies of whose constituents we know nothing, 
 and by which powerful drugs are imbibed at hap- 
 hazard, cannot be too greatly deprecated, f When 
 
 * " So long as the phenomena of waste and repair are in harmony so long, in 
 other words, as the builder follows the scavenger so long man exists in integrity 
 and repair just, indeed, as houses exist. Derange nutrition, and at once degenera- 
 tion, or rather let us say, alteration begins. Alas ! that we are so ignorant that there 
 are many things about our house, which, seeing them weaken, we know not how to 
 strengthen. About the brick and the mortar, the frame and the rafters, we are not 
 unlearned ; but within are many complexities, many chinks and crannies, full in 
 themselves of secondary chinks and crannies, and these so small, so deep, so re- 
 cessed, that it happens every day that the destroyer settles himself, in some place so 
 obscure, that, while he kills, he laughs at defiance. You or I meet with an accident 
 in our watch. We consult the watchmaker, and he repairs the injury. If we were 
 all that watchmakers, like ourselves, should be, a man could be made to keep time 
 until he died from old age or annihilating accident. This I firmly and fully believe." 
 Odd Hours of a Physician. 
 
 t A traveler in Africa states that he was surprised and delighted to find in the 
 
158 CONCLUSION. 
 
 one needs medicine, he needs also a competent phy- 
 sician to advise its use. 
 
 Death and. Decay. By a mystery we cannot under- 
 stand, life is linked with death, and out of the decay 
 of our bodies they, day by day, spring afresh. At 
 last the vital force which has held death and decay 
 in bondage, and compelled them to minister to our 
 growth, and serve the needs of our life, faints and 
 yields the struggle. These powers which have so 
 long time been our servants, gather about our dying 
 couch, and their last offices usher us into the new 
 life and the grander possibilities of the world to 
 come. This last birth, we who see the fading, not 
 the dawning, life, call death. 
 
 ' O Father! grant Thy love divine, 
 To make these mystic temples Thine, 
 When wasting age and wearying strife 
 Have sapp'd the leaning walls of life ; 
 When darkness gathers over all, 
 And the last tottering pillars fall, 
 Take the poor dust Thy mercy warms, 
 And mold it into heavenly forms." 
 
 Holmes. 
 
 possession of the chief medicine man of one of the interior tribes a carefully pre- 
 served copy of the New York Tribune. On inquiry, he found that it was exceedingly 
 valuable, as a minute fragment of it either rubbed on the outside or taken inwardly 
 was a sovereign remedy for as long a list of diseases as ever graced the advertisement 
 of an American pain-killer. The mania which pome people possess for tippling with 
 patent medicines is no more sensible than the trust of the poor savage in a New York 
 daily. 
 
HINTS 
 
 ABOUT 
 
 THE SICK-ROOM 
 
 A SICK-ROOM should be the lightest and cheeriest in the house. 
 A small, close, dark bedroom or a recess is bad enough for one 
 in health, but unendurable for a sick person. In a case of fever, and 
 in many acute diseases, it should be remote from the noise of the 
 family; but when one is recovering from an accident, and in all 
 attacks where quiet is not needed, the patient may be where he can 
 amuse himself by watching the movements of the household, or look- 
 ing out upon the street. 
 
 l^he ventilation mtist be thorough. Bad air will poison the sick and 
 the well alike. A fireplace is, therefore, desirable. Windows should 
 open easily. By carefully protecting the patient with extra blankets, 
 the room may be frequently aired. If there be no direct draught, much 
 may be done to change the air, by simply swinging an outer door to 
 and fro many times. 
 
 A bare floor, with strips of carpet here and there to deaden noise, is 
 cleanest, and keeps the air freest from dust. Cane-bottomed chairs 
 are preferable to upholstered ones. All unnecessary furniture should 
 be removed out of the way. A straw bed or a mattress is better than 
 feathers. The bed-hangings, lace curtains, etc., should be taken down. 
 Creaking hinges should be oiled. Sperm candles are better than 
 kerosene lamps. 
 
 Never whisper in a sick-room. All necessary conversation should be 
 carried on in the usual tone of voice. Do not call a physician 
 unnecessarily, but if one be employed obey his directions implicitly. 
 
160 WHAT TO DO 
 
 Never give nostrums over-officious friends may suggest. Do not 
 allow visitors to see the patient, except it be necessary. Never bustle 
 about the room, nor go on tip-toe, but move in a quiet, ordinary way. 
 Do not keep the bottles in the continued sight of the sick person. 
 Never let drinking-water stand in the room. 
 
 Do not raise the patient's head to drink, but have a cup with a long 
 spout, or use a bent tube, or even a straw. Do not tempt the appe- 
 tite when it craves no food. Bathe frequently, but let the physician 
 prescribe the method. Give written directions to the watchers. Have 
 all medicines carefully marked. Remove all soiled clothing, etc., at 
 once from the room. Change the linen much oftener than in health. 
 When you wish to change the sheets, and the patient is unable to rise, 
 roll the under sheet tightly lengthwise to the middle of the bed ; put 
 on the clean sheet, with half its width folded up, closely to the other 
 roll ; lift the patient on to the newly-made part, remove the soiled 
 sheet, and then spread out the clean one. 
 
 DISINFECTANTS. 
 
 An excellent disinfectant may be made by dissolving in a pail of 
 water either of the following : (i), a quarter of a pound of sulphate of 
 zinc and two ounces of common salt, for each gallon of water ; (2), a 
 pound and a half of copperas, for each gallon of water. Towels, bed- 
 linen, handkerchiefs, etc., should be soaked at least an hour, in a 
 solution of the first kind, and then be boiled, before washing. Vaults, 
 drains, vessels used in the sick-room, etc., should be disinfected by a 
 solution of the second kind ; chloride of lime may also be used for the 
 same purpose. Rooms, furniture, and articles that cannot be treated 
 with the solution of the first kind, should be thoroughly fumigated with 
 burning sulphur. 
 
 WHAT TO DO TILL THE DOCTOR 
 COMES. 
 
 Burns* When a person's clothes catch fire, quickly lay him on the 
 ground, wrap him in a coat, mat, shawl, carpet, or in his own clothes, 
 as best you can to extinguish the fire. Pour ^on plenty of water till 
 the half-burned clothing is cooled. Then carry the sufferer to a warm 
 
TILL THE DOCTOR COMES. 161 
 
 room, lay him on a table or a carpeted floor, and with a sharp knife or 
 scissors remove his clothing. 
 
 The treatment of a burn consists in protecting from the air.* An 
 excellent remedy is to apply soft cloths kept wet with sweet oil, or 
 cold water -which contains all the " cooking soda " that it -will dissolve. 
 Afterward dress the wound with carbolic acid salve. Wrap a dry 
 bandage upon the outside. Then remove the patient to a bed and 
 warmly cover.f Apply cold water to a small burn till the smart 
 ceases, and then cover with ointment.. Do not remove the dressings 
 until they become stiff and irritating ; then take them from a part at a 
 time ; dress and cover again quickly. 
 
 Cuts, Wounds, etc, The method of stopping the bleeding has 
 been described on page 79. If an artery is severed, a physician 
 should be called at once. If the bleeding is not profuse, apply cold 
 water until it ceases, dry the skin, draw the edges of the wound to- 
 gether, and secure them by strips of adhesive plaster. Protect with 
 an outer bandage. This dressing should remain for several days. In 
 the meantime wet it frequently with cold water to subdue inflamma- 
 tion. When suppuration begins, wash occasionally with tepid water 
 and Castile soap. 
 
 Dr. Woodbridge, of New York, in a recent address, gave the follow- 
 ing directions as to " What to do in case of a sudden wound when the 
 surgeon is not at hand." " An experienced person would naturally 
 close the lips of the wound as quickly as possible, and apply a band- 
 age. If the wound is bleeding freely, but no artery is spouting blood, 
 the first thing to be done is to wash it with water at an ordinary tem- 
 perature. To every pint of water add either five grains of corrosive 
 sublimate, or two and a half teaspoonfuls of carbolic acid. If the acid 
 is used, add two table-spoonfuls of glycerine, to prevent its irritating 
 the wound. If there is neither of these articles in the house, add four 
 table-spoonfuls of borax to the water. Wash the wound, close it, and 
 apply a compress of a folded square of cotton or linen. Wet it in the 
 
 * It is a great mistake to suppose that salves wfll " draw out the fire " of a bum, 
 or heal a bruise or cut. The vital force must unite the divided tissue by the deposit 
 of material, and the formation of new cells. 
 
 t If a burn be near a joint or on the face, even if small, let a doctor see it, and do 
 not be in any hurry about having it healed. Remember that with all the care and 
 skill which can be used, contractions will sometimes take place. The danger to life 
 from a burn or scald is not in proportion to its severity, but to its extent that isy a 
 small part, such as a hand or a foot or a face, may be burned so deeply as to cripple it 
 for life, and yet not much endanger the general health ; but a slight amount of burn- 
 ing, a mere scorching, over two-thirds of the body, may prove fatal. Hofc. 
 
102 WHAT TO DO 
 
 solution used for washing the wound, and bandage down quickly and 
 firmly. If the bleeding is profuse, a sponge dipped in very hot water 
 and wrung out in a dry cloth should be applied as quickly as possible. 
 If this is not available, use ice, or cloths wrung out in ice water. If a 
 large vein or artery is spouting, it must be stopped at once by com- 
 pression. This may be done by a rubber tube wound around the arm 
 tightly above the elbow or above the knee, where the pulse is felt to 
 beat; or an improvised 'tourniquet' maybe used. A hard apple or 
 a stone is placed in a folded handkerchief, and rolled firmly in place. 
 This bandage is applied so that the hard object rests on the point 
 where the artery beats, and is then tied loosely around the arm. A 
 stick is thrust through the loose bandage and turned till the flow of 
 blood ceases." 
 
 Bleeding from the Nose is rarely dangerous, and often beneficial. 
 When it becomes necessary to stop it, sit upright and compress the 
 'nostrils between the thumb and forefinger, or with the thumb press 
 upward upon the upper lip. A piece of ice, a snow-ball, or a com- 
 press wet with cold water may be applied to the back of the neck. 
 
 A Sprain is often more painful and dangerous than a dislocation. 
 Wrap the injured part in flannels wrung out of hot water, and cover 
 with a dry bandage, or, better, with oiled silk. Liniments and stimu- 
 lating applications are injurious in the first stages, but useful when 
 the inflammation is subdued. Do not let the limb hang down. It must 
 be kept quiet, even after all pain has ceased. If used too quickly, 
 dangerous consequences may ensue. 
 
 Diarrhea, Cholera Infantum, etc., are often caused by eating 
 indigestible food or by checking of the perspiration ; but more fre- 
 quently by peculiar conditions of the atmosphere, especially in large 
 cities. If the limbs are cold, give a hot bath, and rub thoroughly. 
 If possible, go to bed and lie quietly on the back. Rest is better than medi- 
 cine. If there be pain, apply repeatedly to the abdomen flannels 
 wrung out of hot water. If medicine is needed, take fifteen drops of 
 peppermint and thirty of paregoric in a wine-glass of warm water ; or 
 an adult may take twenty drops of spirits of camphor and thirty to 
 forty drops of laudanum. Laudanum should rarely be given to an 
 infant, except by a physician's order. Eat no fruit, vegetables, pastry, 
 or pork. If much thirst exist, give small pieces of ice, or cold tea or 
 toast-water. 
 
 Croup. Send at once for a doctor. Induce vomiting by syrup of 
 ipecac or mustard and water. Put the feet in a hot bath. Apply hot 
 fomentations rapidly renewed to the chest and throat. 
 
TILL THE DOCTOR COMES. 163 
 
 Sore Throat. Wrap the neck in a wet bandage, and cover with 
 red flannel or a woolen stocking. Gargle the throat frequently with 
 a solution of a tea-spoonful of salt in a pint of water, or thirty grains 
 of chlorate of potash in a wine-glass of water. 
 
 Fits, Apoplexy, Epilepsy, etc, Loosen the clothing, and raise 
 the head and shoulders, but do not bend the head forward on the 
 neck. Apply cold to the head, and heat to the feet. Follow with an 
 emetic. In a child, a full hot bath is excellent. When there are con- 
 vulsions, prevent the patient from injuring himself; especially put 
 something in his mouth to keep him from biting his tongue. 
 
 Toothache and Earache. Insert in the hollow tooth, or in the 
 ear, cotton wet with laudanum, spirits of camphor, or chloroform. 
 When the nerve is exposed, wet it with creosote or carbolic acid. 
 Hot cloths or a hot brick wrapped in cloth and held to the face will 
 often relieve the toothache. In a similar manner treat the ear, wetting 
 the cloth in hot water, and letting the vapor pass into the ear. 
 
 Choking. Ordinarily a smart blow between the shoulders, causing 
 a compression of the chest and a sudden expulsion of the air from the 
 lungs, will throw out the substance. If the person can swallow, and 
 the object be small, give plenty of bread or potato, and water to wash 
 it down. Press upon the tongue with a spoon, when, perhaps, you 
 may see the offending body, and draw it out with a blunt pair of scis- 
 sors. If neither of these remedies avail, give an emetic of syrup of 
 ipecac or mustard and warm water. 
 
 Frost Bites are frequently so sudden that one is not aware when 
 they occur. In Canada it is not uncommon for persons meeting in 
 the street to say, " Mind, sir, your nose looks whitish." The blood 
 cools and runs slowly, and the blood-vessels become choked and 
 swollen. Keep from the heat. Rub the part quickly with snow, if 
 necessary for hours, till the natural color is restored. If one is 
 benumbed with cold, take him into a cold room, remove the wet 
 clothes, rub the body dry, cover with blankets, and give a little warm 
 tea or \\ eak brandy and water. On recovering, let him be brought to 
 a fire gradually.* 
 
 Fevers, and many acute diseases, are often preceded by a loss of 
 appetite, headache, shivering, "pains in the bones," indisposition to 
 
 * If you are caught in a snow-storm, look for a snow-bank in the lee of a hill, or 
 a wood out of the wind, or a hollow in the plain filled with snow. Scrape out a 
 hole big enough to creep into, and the drifting snow will keep you warm. Men and 
 animals have been preserved after days of such imprisonment Remember that if 
 you give way to sleep in the open field, you will never awake. 
 
164 WHAT TO DO 
 
 work, etc. In such cases, sponge with tepid water, and rub the body 
 till all aglow. Go to bed, place hot bricks to the feet, take nothing 
 but a little gruel or beef tea, and drink moderately of warm, cream-of- 
 tartar water. If you do not feel better the next morning, call a phy- 
 sician. If that be impossible, take a dose of castor-oil or Epsom salt. 
 
 Sun-stroke is a sudden prostration caused by intense heat. The 
 same effect is produced by the burning rays of the sun and the fierce 
 fire of a furnace. When a person falls under such circumstances, 
 place your hand on his chest. If the skin be cool and moist, it is not 
 a sun-stroke ; but if it be dry and " biting hot," there can be no mis- 
 take. Time is now precious. At once carry the sufferer to the nearest 
 pump or hydrant, and dash cold water on the head and chest until 
 consciousness is restored. Dr. H. C. Wood. 
 
 To prevent sun-stroke, wear a porous hat, and in the top of it place 
 a wet handkerchief ; also drink freely of water, not ice cold, to induce 
 abundant perspiration. 
 
 Asphyxia, or apparent death, whether produced by drowning, suf- 
 focation, bad air, or coal gas, requires very similar treatment. Send 
 at once for blankets, dry clothing, and a physician. Treat the sufferer 
 upon the spot, if the weather be not too unfavorable. 
 
 1. Loosen the clothing about the neck and chest. 
 
 2. Turn the patient on his face, open the mouth, draw out the 
 tongue, and cleanse the nostrils, so as to clear the air-passages. 
 
 3. Place the patient on his back, grasp his arms firmly above the 
 elbows, and pull them gently upward until they meet over the head, in 
 order to draw air into the lungs. Then bring the arms back by the side, 
 to expel the air. Repeat the process about fifteen times per minute. 
 Alternate pressure upon the chest, and blowing air into the mouth 
 through a quill or with a pair of bellows, may aid your efforts. Excite 
 the nostrils with snuff or smelling salts, or by passing hartshorn under 
 the nose. Do not cease effort while there is hope. Life has been 
 restored after five hours of suspended animation. 
 
 4. When respiration is established, wrap the patient in dry, warm 
 clothes, and rub the limbs under the blankets or over the dry clothing 
 energetically toward the heart. Apply heated flannels, bottles of hot 
 water, etc., to the limbs, and mustard plasters* to the chest. 
 
 Foreign Bodies in the Ear- Insects may be killed by dropping 
 a little sweet oil into the ear. Beans, peas, matches, etc., may gener- 
 
 * The best mustard poultice is the paper plaster now sold by every druggist. It 
 is always ready, and can be carried by a traveler. It has only to be dipped in 
 water, and applied at once. 
 
TILL THE DOCTOR COMES. 165 
 
 ally be removed by cautiously syringing the ear out with tepid water. 
 Do not use much force lest the tympanum be injured. If this fail, dry 
 the ear, stick the end of a fittle linen swab into thick glue, let the 
 patient lie on one side, put this into the ear until it touches the sub- 
 stance, keep it there three-quarters of an hour while it hardens, and 
 then draw them all out together. Be careful that the glue does not touch 
 the skin at any point, and that you are at work upon the right ear 
 Children often deceive one as to the ear which is affected. 
 
 Foreign Bodies in the Nose, such as beans, cherry-pits, etc., 
 may be frequently removed by closing the opposite nostril, and then 
 blowing into the child's mouth forcibly. The air. unable to escape 
 except through the other nostril, will sweep the obstruction before it. 
 
166 ANTIDOTES TO POISONS. 
 
 ANTIDOTES TO POISONS. 
 
 Acids : Nitric (aqur. fortis), hydrochloric (muriatic), sulphuric (oil of 
 vitriol), oxalic, etc. Drink a little water to weaken the acid, or, still 
 better, take strong soap-suds. Stir some magnesia in water, and 
 drink freely. If the magnesia be not at hand, use chalk, soda, lime, 
 whiting, soap, or even knock a piece of plaster from the wall, and 
 scraping off the white outside coat pound it fine, mix with milk or 
 water, and drink at once. Follow with warm water, or flax-seed tea. 
 
 Alkalies : Potash, soda, ley, ammonia (hartshorn). Drink weak vin- 
 egar or lemon juice. Follow with castor or linseed oil, or thick 
 cream. 
 
 Antimony ' Antimonial Wine, tartar emetic, etc. Drink strong, 
 green tea, and in the mean time chew the dry leaves. The direct anti- 
 dote is a solution of nut-gall or oak-bark. 
 
 Arsenic : Cobalt, Scheele's green, fly-powder, ratsbane, etc. Give plenty 
 of milk, whites of eggs, or induce vomiting by mustard and warm 
 water, or even soap-suds. 
 
 Bite of a Snake or a Mad Dog. Tie a bandage above the 
 wound, if on a limb. Wash the bite thoroughly, and, if possible, let the 
 person suck it strongly. Rub some lunar caustic or potash in the 
 wound, or heat the point of a small poker or a steel-sharpener white 
 hot, and press it into the bite for a moment. It will scarcely cause 
 pain, and will be effectual in arresting the absorption of the poison, 
 unless a vein has been struck. 
 
 Copper : Sulphate of copper (blue vitriol), acetate of copper (verdigris). 
 Take whites of eggs or soda. Use milk freely. 
 
 Laudanum Opium, paregoric, soothing cordial, soothing syrup, etc. 
 Give an emetic at once of syrup of ipecac, or mustard and warm 
 water, etc. After vomiting, use strong coffee freely. Keep the patient 
 awake by pinching, pulling the hair, walking about, dashing water in 
 the face, and any expedient possible. 
 
 Lead: White lead, acetate of lead (sugar of lead), red lead. Give an 
 emetic of syrup of ipecac, or mustard and warm water, or salt and 
 water. Follow with a dose of Epsom salt. 
 
 Matches : Phosphorus. Give magnesia, chalk, whiting, or even 
 flour in water, and follow with mucilaginous drinks. 
 
 Mercury ; Calomel, chloride of mercury (corrosive sublimate, bug 
 poison), red precipitate. Drink milk copiously. Take the whites of 
 eggs, or even stir flour in water, and use freely. 
 
ANTIDOTES. 167 
 
 Nitrate of Silver (lunar caustic). Give salt and water, and follow 
 with castor-oil. 
 
 Nitrate of Potash (saltpetre, nitre). Give mustard and warm 
 water, or syrup of ipecac. Follow with flour and water, and cream or 
 sweet oil. 
 
 PrilSSic Acid (oil of bitter almonds), cyanide of potassium. Take a 
 tea-spoonful of hartshorn in a pint of water. Apply smelling salts to 
 the nose, and dash cold water in the face. 
 
 Sting of an Insect. Apply a little hartshorn or spirits of cam- 
 phor, or soda moistened with water, or a paste of clean earth and 
 saliva. 
 
 Sulphate of Iron (green vitriol). Give syrup of ipecac, or mus- 
 tard and warm water, or any convenient emetic ; then magnesia and 
 water. 
 
QUESTIONS FOR CLASS USE 
 
 The questions include the notes. The figures refer to the pages. 
 
 INTRODUCTION. 
 
 ILLUSTRATE the value of physiological knowledge. Why should 
 physiology be studied in youth? When are our habits formed? How 
 do habits help us ? Why should children prize the lessons of expe- 
 rience. How does Nature punish a violation of her laws? Name 
 some of Nature's laws. What is the penalty of their violation? Name 
 some bad habits and their punishments. Some good habits and their 
 rewards. How do the young ruin their health? Compare one's con- 
 stitution with a deposit in the bank. Can one in youth lay up health 
 as he can money for middle or old age ? Is not the preservation of 
 one's health a moral duty? What is suicide ? 
 
 THE SKELETON. 
 
 How many bones are there in the body? Is the number fixed? 
 What is an organ? (See Glossary.) A function? Name the three 
 uses of the bones. Why do the bones have such different shapes? 
 Why are certain bones hollow ? Round ? Illustrate. Why are iron 
 pillars in stores cast hollow? What is the composition of bone? How 
 does it vary ? 
 
 12. How can you remove the mineral matter ? The animal mat- 
 ter? Why is a burned bone white and porous? What is the use of 
 each of the constituents of a bone? What food do dogs find in bones? 
 What is ossification ? Why are not the bones of children as easily 
 broken as those of aged persons? Why do they unite so much 
 
THE SKELETON. 169 
 
 quicker ? Describe the structure of a bone. What is the object of 
 the filling? Why does the amount vary in different parts of a bone ? 
 
 13. What is the appearance of a bone seen through a microscope ? 
 How do bones grow? Illustrate. How does a broken bone heal? 
 How rapidly is bone produced? Illustrate. What is the object of 
 "splints"? Describe how a joint is packed. Lubricated. How are 
 the bones tied together ? What is a tissue ? (See Glossary.) Illustrate. 
 
 14. Name the three general divisions of the bones. What is the 
 object of the skull ? Which bone is movable ? How is the lower jaw 
 hinged ? Describe the construction of the skull. What is a suture? \^ 
 
 15. Tell how the peculiar form and structure of the skull adapt it for 
 its use. What two cavities are in the trunk ? Name its principal 
 bones. Describe the spine. What is the object of the projections? 
 Of the pads? Why is a man shorter at night than in the morning? 
 
 16. Describe the perfection of the spine. The articulation (see 
 Glossary) of the skull with the spine. 
 
 17. Describe the ribs. What is the natural form of the chest? Why 
 is the thorax, or chest, made in separate pieces ? How does the oblique 
 position of the ribs aid in respiration? (See p. 53.) 
 
 18. How do the hipbones give solidity? What two sets of limbs 
 branch from the trunk? State their mutual resemblance. 
 
 19. Name the bones of the shoulder. Describe the collar-bone. 
 The shoulder-blade. Name the bones of the arm. Describe the 
 shoulder-joint. The elbow joint. The wrist. 
 
 20. Name the bones of the hand (see p. 24). The fingers. Describe 
 their articulations. What gives the thumb its freedom of motion ? In 
 what lies the perfection of the hand ? 
 
 21. Describe the hip-joint. What gives the upper limbs more free- 
 dom of motion than the lower? Name the bones of the lower limbs. 
 Describe the knee-joint. The patella. What is the use of the fibula? 
 Can you show how the lower extremity of the fibula, below its juncture 
 with the tibia, is prolonged to form a part of the ankle-joint? 
 
 22. Name the bones of the foot. What is the use of the arch of the 
 foot ? What makes the step elastic ? Describe the action of the foot 
 as we step. In graceful walking should the toes or the heel touch the 
 ground first ? What are the causes of deformed feet ? What is the 
 natural position of the big toe ? Did you ever see a big toe lying in a 
 
170 QUESTIONS FOR CLASS USE. 
 
 straight line with the foot, as shown in statuary and paintings ? How 
 should we have our boots 2.nd shoes made ? What are the effects of 
 high heels ? Of narrow heels ? Of narrow toes ? Of tight-laced boots? 
 Of thin soles? What are the rickets? Cause of this disease? Cure? 
 Cause of bow-legs ? Cure ? 
 
 23. What is the correct position in sitting at one's desk? Is there 
 any necessity for walking and sitting erect ? Describe the bad effects 
 of a stooping position. What is a sprain? Why does it need special 
 care? What is a dislocation? (See Glossary.) 
 
 THE MUSCLES. 
 
 25. WHAT is the use of the skeleton? How is it concealed? Why 
 is it the image of death? What are the muscles? How many are 
 there ? What peculiar property have they ? How are they arranged ? 
 Where is the biceps ? The triceps ? How do the muscles move the 
 limbs? Illustrate. 
 
 26. Name and define the two kinds of muscles. Illustrate each. 
 What is the structure of a muscle? Of what is a fibril itself com- 
 posed ? 
 
 27-8. Describe the tendons. What is their use? Illustrate the 
 advantages of this mode of attachment. What two special arrange- 
 ments of the tendons in the hand ? Their use ? How is the rotary 
 motion of the eye obtained ? 
 
 29. What advantages are gained by the enlargement of the bones at 
 the joints? Illustrate. How do we stand erect? Is it an involuntary 
 act? Why cannot a child walk at once, as many young animals do? 
 Why can we not hold up the head easily when we walk on "all 
 fours"? Why cannot an animal stand erect as man does? 
 
 30. Describe the process of walking. Show that walking is a pro- 
 cess of falling. Describe the process of running. What causes the 
 swinging of the hand in walking? Why are we shorter when walk- 
 ing? Why does a person when lost often go in a circle? In which 
 direction does one always turn in that case ? WTiat is the muscular 
 sense? Its value? 
 
THE SKIN. 171 
 
 31-2. Value of exercise ? Is there any danger of violent exercise ? 
 For what purpose should we exercise ? Should exercise be in the 
 open air? What is the Law of Health in regard to exercise? Is a 
 young person excusable, who leads a sedentary life, and yet takes 
 no daily out-door exercise ? What will be nature's penalty for such a 
 violation of her law? Will a postponement of the penalty show that 
 we have escaped it? Ought a scholar to study during the time of 
 recess? Will a promenade in the vitiated air of the school-room fur- 
 nish suitable exercise ? What is the best time for taking exercise ? 
 Who can exercise before breakfast ? What are the advantages of the 
 different kinds of exercise ? Should we not walk more ? What is the 
 general influence upon the body of vigorous exercise? State some of 
 the wonders of the muscles. 
 
 33. What is the St. Vitus's dance? Cure? What is the locked-jaw? 
 Causes? The gout? Cause? Cure? The rheumatism? Its two 
 forms? Peculiarity of the acute? Danger? Is there any particular 
 mode of treating it ? 
 
 THE SKIN. 
 
 35. WHAT are the uses of the skin ? Describe its adaptation to its 
 place. What is its function as an organ ? Describe the structure of 
 the skin. The sensitiveness of the cutis. The insensitiveness of the 
 cuticle. 
 
 46. Flow is the skin constantly changing? The shape and number 
 of the cells ? Value of the cuticle ? How is the cuticle formed ? What 
 is the complexion? Its cause? Why is a scar white? What is the 
 cause of "tanning "? What are freckles ? Describe the action of the 
 sun on the skin. Why are hairs and the nails spoken of under the 
 head of the skin ? 
 
 37. Uses of the hair ? Its structure ? What is the hair-bulb? What 
 is it called ? How does a hair grow ? When can it be restored, if de- 
 stroyed ? What is the danger of hair-dyes? Are they of any real 
 value? How can the hair stand on end? How do horses move their 
 skin? Is there any feeling in a hair? What are the uses of the 
 nails? 
 
172 QUESTIONS FOR CLASS USE. 
 
 38. How do the nails grow? What is the mucous membrane? Its 
 composition? The connective tissue? Why so called? What use 
 does it subserve ? What is its character ? 
 
 39. Name some of the many uses of the membranes in the body. 
 How does the fat exist in the body? Its uses? Where is there no 
 fat? Name and describe the four kinds of teeth. What are the milk 
 teeth? Describe them. 
 
 41. What teeth appear first? When do the permanent teeth appear? 
 Describe their growth. Which one comes first ? Last ? Describe the 
 structure of the teeth. 
 
 42. Why do the teeth decay? What care should be taken of the 
 teeth? What caution should be observed? What are the oil glands? 
 Use of this secretion ? 
 
 43. What are the perspiratory glands? State their number. Their 
 total length. What are the " pores" of the skin? What is the per- 
 spiration? What is the constitution of the perspiration ? Illustrate 
 its value. Why do we need to bathe so often? 
 
 44. When is the best time for a bath ? Why ? Value of friction ? 
 Should a bath be taken just before or after a meal ? Is soap beneficial ? 
 What is the "reaction"? Explain its invigorating influence. How 
 is it secured? General effect of a cold bath? Of a warm bath? If 
 we feel chilly and depressed after a bath, what is the teaching? 
 
 45. Why is the sea-bath so stimulating? How long should one 
 remain in any bath? How does clothing keep us warm? Explain 
 the use of linen as an article of clothing. Cotton. Woolen. Flan- 
 nel. How can we best protect ourselves against the changes of our 
 climate ? 
 
 46-7. What colored clothing is best adapted for all seasons? Value 
 of the nap? Furs? Thick vs. thin clothing? Should we wear thick 
 clothing during the day, and in the evening put on thin clothing? 
 Can children endure exposure better than grown persons ? What are 
 corns? What is the cause? Cure? What are in-growing nails? 
 What is the cure ? Warts ? Cure ? Chilblain ? Cause ? Preventive ? 
 
RESPIRATION AND THE VOICE. 173 
 
 RESPIRATION AND THE VOICE 
 
 49. NAME the organs of respiration and the voice. Describe the 
 larynx. The epiglottis. The oesophagus. What is meant by food 
 "going the wrong way " ? 
 
 50. Describe the vocal cords. Their use. How is sound pro- 
 duced ? 
 
 51. How are the higher tones of the voice produced ? The lower? 
 Upon what does loudness depend ? 
 
 52. What is the cause of the voice "charging"? What is speech? 
 Vocalization? Could a person talk without his tongue? How is a 
 formed by the voice ? Difference between a sigh and a groan ? What 
 vowel sounds are made in laughing? Does whistling depend on the 
 voice ? Tell how the various consonants are formed. What are the 
 labials? The dentals? The linguals? What vowels does a child 
 pronounce first? 
 
 53. Describe the wind-pipe. The bronchi. The bronchial tubes. 
 Why is the trachea so called ? Describe the structure of the lungs. 
 What are the lungs of slaughtered animals called ? Why will a piece 
 of the lungs float on water? Name the wrappings of the lungs. 
 Describe the pleura. How is friction prevented ? What are the cilia ? 
 What is their use? What two acts constitute respiration? 
 
 54. In what two ways may the position of the ribs change the capa- 
 city of the chest ? Describe the process of respiration. Expiration. 
 
 55. How often do we breathe? Describe the diaphragm. Its use in 
 breathing. What is coughing? Sneezing? Snoring? Laughing? 
 Crying ? Hiccough ? What is meant by the breathing capacity ? How 
 does it vary? How much, in addition, can the lungs expel forcibly? 
 Can we expel all the air from our lungs? Value of this constant sup- 
 ply? 
 
 56. How constant is the need of air? What is the vital element of 
 the air ? Describe the action of the oxygen in our lungs. What does 
 the blood give up? Gain ? How can this be tested ? What are the 
 constituents of the air? What are the peculiar properties and uses of 
 each? What is the condition of the air we exhale? Which is the 
 most dangerous constituent? 
 
174 QUESTIONS FOR CLASS USE. 
 
 57-63. Describe the evil effects of re-breathing the air. Give illus- 
 trations of the dangers of bad air. What is meant by the germs of dis- 
 ease floating in the air ? Describe the need of ventilation. Will a 
 single breath pollute the air ? What is the influence of a fire or a 
 light? Of a hot stove? When is the ventilation perfect? What dis- 
 eases are largely owing to bad air? Should the windows and doors 
 of any room be tightly closed, if we have no other means of ventila- 
 tion? Is not a draught of air dangerous? How can we prevent this, 
 and yet secure fresh air ? What is the general principle of ventila- 
 tion ? Must pure air necessarily be cold air? Are school-rooms 
 properly ventilated? What is the effect? Are churches? Are our 
 bed-rooms? Can we, at night, breathe anything but night air? Is 
 the night air out-of-doors ever injurious? 
 
 63-5. Describe some of the wonders of respiration. How is con- 
 striction of the lungs produced? When may clothing be considered 
 tight ? What are the dangers of tight-lacing ? Which would i lake 
 the stronger, more vigorous, and longer-lived person, the form shown 
 in A or B, Fig. 28? Is it safe to run any risk in this dangerous direc- 
 tion? What is the bronchitis? Pleurisy? Pneumonia? Consump- 
 tion ? What is one great cause of this disease ? How may a consti- 
 tutional tendency to this disease be warded off in youth? What is 
 asphyxia? Describe the process for restoring such a person. (See 
 Appendix?) What is the diphtheria? Its peculiarity? Danger? 
 
 66. The croup? Its characteristics? Remedy? (See Appendix.} 
 Cause of stammering ? How cured ? 
 
 THE CIRCULATION. 
 
 67. NAME the organs of the circulation. Does the blood per- 
 meate all parts of the body ? What is the average amount in each 
 person? Its composition? 
 
 68. What is the plasma? Describe the red cells (corpuscles). The 
 white. What is the size of a red cell? Are the shape and size 
 uniform ? Are the disks permanent? What substances are contained 
 
THE CIRCULATION. 175 
 
 in the plasma? What is fibrin ? In what sense is the blood "liquid 
 flesh" ? What is the use of the red disks? What is the office of the 
 oxygen in the body ? Where is the blood purified ? 
 
 69. What is the cause of coagulation of the blood ? Value of this 
 property ? What organ propels the blood ? 
 
 70. What is the location of the heart ? How large is it ? Put your 
 hand over it. What is the pericardium ? How many chambers in the 
 heart ? 
 
 71. What is their average size? What is meant by the right and 
 the left heart ? What are the auricles ? Why so called ? The ventri- 
 cles? What is the use of the auricles? The ventricles? Which are 
 made the stronger ? Show the need of valves in the ventricles. Why 
 are there no valves in the auricles ? 
 
 72. Describe the tricuspid valve. The bicuspid. Describe the semi- 
 lunar valves. What are the arteries ? Why so named ? What is their 
 use ? Their structure ? How does their elasticity act ? What is the 
 aorta ? What is the pulse ? 
 
 73. On which arteries can we best feel it ? What is the average 
 number of beats per minute? How and why does this vary? Why 
 does a physician feel a patient's pulse? What are the veins? What 
 blood do they carry? Describe the venous system. Describe the 
 valves of the veins. Which valves of the heart do they resemble? 
 Where and how can we see the operation of these valves ? What are 
 the capillaries ? 
 
 74. What is the function of the capillaries? What changes take 
 place in this system ? Describe the circulation of the blood as seen in 
 the web of a frog's foot. In what two portions is the general circula- 
 tion divided ? 
 
 75. Describe the route of the blood by the diagram, i. The lesser 
 circulation ; 2. The greater circulation. 
 
 76. How long does it require for all the blood to pass through the 
 heart? How long does it take the blood to make the tour of the 
 body? What is the average temperature of the body? How and 
 where is the heat of the body generated ? How is it distributed ? How 
 is the temperature of the body regulated ? In what way does life exist 
 through death? 
 
 77. Is not this as true in the moral as in the physical world? What 
 
176 QUESTIONS FOR CLASS USE. 
 
 does it teach ? How rapidly do our bodies change ? Name some of 
 the wonders of the heart. 
 
 78. What is the lymphatic circulation? What is the thoracic duct? 
 The lymph? The glands? 
 
 79. Give some illustrations of the action of the lymphatics of the 
 different organs. How do hibernating animals live during the 
 winter ? What is a congestion ? Its cause ? Blushing ? Why does 
 terror cause one to grow cold and pale? How is an inflammation 
 caused? Name its four characteristics. How may severe bleeding be 
 stopped? How can you tell whether the blood comes from an artery 
 or a vein ? 
 
 80. What is the scrofula ? What are " kernels " ? How may a scro 
 fulous tendency of the system be counteracted ? What is the cause of 
 "a cold "? Why does exposure sometimes cause a cold in the head, 
 sometimes on the lungs, and at others brings on a rheumatic attack ? 
 What is the theory of treating a cold ? 
 
 81-2. How is alcohol always made? Does it exist in nature? De- 
 scribe the general process of fermentation. What is " malt " ? How 
 is beer made? What is distillation? How is whisky manufactured ? 
 
 83. Illustrate some of the properties of alcohol. Illustrate the 
 general effect of alcohol upon the circulation. 
 
 84-9. Upon the heart. Upon the membrane. Upon the blood. 
 Upon the lungs. When does it cause consumption ? What is meant 
 by a " fatty degeneration " of the heart ? How does alcohol check the 
 regular process of oxidation, or waste and repair of the body ? 
 
 DIGESTION AND FOOD. 
 
 91. WHY do we need food ? Why will a person starve without 
 food ? How much food is needed per day by an adult in active 
 exercise? How much in a year? Describe the body as an eddy. 
 What does food do for us? What does food contain? How is this 
 force set free ? Do we then draw all our power from nature ? What 
 becomes of these forces when we are done with them ? Do we destroy 
 the force we use ? A us. No matter has been destroyed, so far as we 
 know, since the creation, and force is equally indestructible. 
 
DIGESTION AND FOOD. 177 
 
 92. Compare our food to a tense spring. What three kinds of food 
 do we need ? What is nitrogenous food ? Name the common forms. 
 What is the characteristic of nitrogenous food ? Why called albumi- 
 nous? What is carbonaceous food? Name the two kinds. What are 
 the constituents of sugar? Where is starch ranked ? Why? Use of 
 carbonaceous food ? 
 
 93. Name the mineral matters which should be contained in our 
 food. What do you say of the abundance and necessity of water? 
 Ought we not to exercise great care in selecting the water we drink?* 
 Will not the character of our food influence the quantity of water we 
 need? What are the uses of these different minerals? Illustrate from 
 your own knowledge the importance of salt. Could a person live on 
 one kind of food alone ? Illustrate. Describe the effect of living on 
 lean meat. Show the necessity of a mixed diet. Illustrate. Show the 
 need of digestion. Illustrate. 
 
 94. Describe the general plan of digestion. What amount of liquid 
 is daily secreted by the alimentary canal ? What is the alimentary 
 canal ? How is it lined ? Define secretion. Describe the saliva. 
 
 95. How is it secreted ? What is the amount per day ? Its use ? 
 What tends to check or increase the flow of saliva? Describe the pro- 
 cess of swallowing. The stomach. Its size. 
 
 96. Its construction. What is the pylorus? For what does this 
 open? What is the gastric juice? How abundant is it? What prin- 
 ciple does it contain? How is its flow influenced? What is its use? 
 Appearance of the food as it passes through the pylorus? What is the 
 construction of the intestines ? 
 
 98. How are the intestines divided? What is the duodenum? 
 Why so called ? What juices are secreted here? What is the bile? 
 Describe the liver. What is its weight ? Its construction ? Ans. It 
 
 * Water which has passed through lead-pipes is apt to contain salts of that metal, 
 and is therefore open to suspicion. Metallic-lined ice-pitchers, galvanized iron 
 reservoirs, and many soda-water fountains, are liable to the same objection. There 
 are also organic impurities in water equally dangerous. River-water often dissemi- 
 nates the germs of typhoid fever and other diseases just as the air scatters the seeds 
 of small-pox and scarlet fever. Thus the great outbreak of cholera in the east of 
 London, in 1866, was traced to the contamination of the River Lea, which furnished 
 the supply of water to that part of the city. The surface water frequently flows into 
 a well carrying organic matter to poison its contents. Wells sometimes receive 
 underground the drainage from grave-yards, manufactories, cess-pools, swamps, 
 barn-yards, vaults, etc., all of which render the water unfit for use. 
 
178 QUESTIONS FOR CLASS USE. 
 
 consists of a mass of polyhedral cells only T ^ to ^^ of an inch in 
 diameter, filling a mesh of capillaries. The capillaries carry the blood 
 to and fro, and the cells secrete the bile. What is the cyst ? What 
 does the liver secrete from the blood besides the bile? What is its 
 use? What is the pancreatic juice? Its use? 
 
 99. Appearance of the food when it leaves the duodenum ? Describe 
 the small intestine. W T hat is absorption ? 
 
 100. In what two ways is the food absorbed ? Where does the pro- 
 cess commence? How long does it last? Describe the lacteals. Of 
 what system do they form a part? What do the veins absorb? 
 Where do they carry the food ? How is it modified ? What length of 
 time is usually required for digestion in the stomach? May not food 
 which requires little time in the stomach need more in the other 
 organs, and vice versa? Tell the story of Alexis St. Martin. 
 
 101. What time did he require to digest apples? Eggs, raw and 
 cooked? Roast beef ? Pork? Which is the king of the meats ? What 
 is the nutritive value of mutton? Lamb? How should it be cooked? 
 Objection to pork ? What is the trichina? Should ham ever be eaten 
 raw? Value of fish? Oysters? Milk? Cheese? Eggs? 
 
 102. Bread ? Brown bread ? Are warm biscuit and bread health- 
 ful ? Nutritive value of corn ? The potato ? Of ripe fruits ? Of 
 coffee ? To what is its stimulating property due ? Its influence on 
 the system ? When should it be discarded ? 
 
 103. Effects of tea ? Influence of strong tea? What is the active 
 principle of tea ? What is the effect of cooking food ? What precau- 
 tion in boiling meat ? In roasting ? Object of this high temperature ? 
 What precaution in making soup? Why is frying an unhealthful mode 
 of cooking ? State the five evil results of rapid eating. What disease 
 grows out of it? If one is compelled to eat a meal rapidly, as at a 
 railroad station, what should he take? 
 
 104. Why does a child need more food proportionately than an old 
 person ? State the relation of waste to repair in youth, in middle, and 
 in old age. What kind and quantity of food does a sedentary occu- 
 pation require ? What caution should students who have been accus- 
 tomed to manual labor observe ? Must a student starve himself? Is 
 there not danger of over-eating ? Would not an occasional abstinence 
 from a meal be beneficial ? Do not most people eat more than is for 
 
THE NERVOUS SYSTEM. 179 
 
 their good ? How should the season regulate our diet ? The climate ? 
 Illustrate. What is the effect upon the circulation of taking food ? 
 Should we labor or study just before or after a meal? Why not? 
 What time should intervene between our meals? Is "lunching" a 
 healthful practice? Should we eat just before retiring? When we 
 are very tired ? 
 
 105. Why should care be banished from the table ? Will a regular 
 routine of food be beneficial ? Describe some of the wonders of diges- 
 tion. 
 
 106. What are the principal causes of dyspepsia? How may we 
 avoid that disease? What are the mumps? What care should be 
 taken? 
 
 107-113. Is alcohol a food ? Illustrate. Compare the action of alco- 
 hol with that of water. Does all the alcohol taken into the stomach go 
 off unchanged ? Does alcohol contain any element needed by the 
 body? What is the effect of alcohol upon the digestion? Upon the 
 pepsin of the gastric juice? Upon the albuminous food ? What is a 
 "fatty degeneration of the kidneys "? Will alcohol help one to endure 
 cold and exposure ? Will liquor strengthen the muscles of a working 
 man ? Is alcohol digested ? Is liquor a wholesome " tonic " ? Is it a 
 good plan to take a glass of liquor before dinner ? What is the effect 
 of alcohol upon the liver ? What is the " Hob nail " liver ? What is 
 the general effect of alcohol upon the kidneys ? Does alcohol impart 
 heat to the body? Does it confer strength? What does Dr. Kane 
 say? Describe Richardson's experiments. How does alcohol act 
 in creating an appetite for itself? What is alcoholism? What is 
 heredity? 
 
 THE NERVOUS SYSTEM. 
 
 115. WHAT are the organs of the nervous system? What is the 
 general use of this system? What is the gray matter? Its use? 
 The white matter ? Its use ? Describe the brain. What is its office ? 
 Its size? How does it vary? 
 
 117. Name its two divisions. Describe the cerebrum. The convo- 
 
180 QUESTIONS FOR CLASS USE. 
 
 lutions. The membranes which bind the brain together. What do 
 you say of the quantity of blood which goes to the brain ? What does 
 it show ? What do the convolutions indicate? What is the use of the 
 two halves of the brain? 
 
 1 1 8. What is the effect of removing the cerebrum? Describe the 
 cerebellum. 
 
 119. What is the arbor vitse? What does this part of the brain con- 
 trol ? What is the effect of its being injured ? Illustrate. Describe the 
 spinal cord. What is the medulla oblongata? Describe the nerves. 
 Is each part of the body supplied with its own nerve? 
 
 120-3, Prove it. What are the motory nerves? The sensory? 
 When will motion be lost and feeling remain, and vice versa? What 
 is meant by a transfer of pain ? Illustrate. Name the three classes of 
 nerves, What are the spinal nerves ? Describe the origin of the spinal 
 nerve. What is the effect of cutting a sensory root? A motory root? 
 What are the cranial nerves? Name the twelve pairs. Describe 
 the sympathetic system. What is its use? How does the brain 
 control all the vital processes? What is meant by the crossing of the 
 cords? What is the effect ? What is reflex action ? 
 
 I2*;. Give illustrations. Give instances of the unconscious action 
 of the brain. Can there be feeling or motion in the lower limbs when 
 the spinal cord is destroyed ? What are the uses of reflex action ? 
 State its value in the formation of habits. How does the brain grow? 
 
 125. What laws govern it ? What must be the effect of constant 
 light-reading? Of over-study or mental labor? State the relation of 
 sleep to repair and waste. How many hours does each person need? 
 What kind of work requires most sleep ? What danger is there in 
 obtaining sleep by medicine ? What is the influence of sunlight on 
 the body ? 
 
 126. Illustrate. Name some of the wonders of the brain. 
 127-131. What four stages are there in the effect of alcohol on the 
 
 nervous system ? Describe each. Does alcohol confer any permanent 
 strength? What is the physiological effect of alcohol on the brain? 
 On the mental and moral powers? What is the Delirium Tremens? 
 Do you think a man should be punished for a crime he commits while 
 drunk? How does alcohol interfere with the action of the nerves? 
 What is the general effect of alcohol upon the character ? Does alcohol 
 
THE SPECIAL SENSES. 181 
 
 tend to produce clearness and vigor of thought ? What is the cause 
 of the "alcoholic chill "? Show how alcohol tends to develop man's 
 lower, rather than his higher, nature. When we wish really to strengthen 
 the brain, should we use alcohol ? Why is alcohol used to preserve 
 anatomical specimens? What is meant by an inherited taste for liquor? 
 To what extent are we responsible for the health of our body ? Why 
 does alcohol tend to collect in the brain ? Does the use of alcohol 
 tend to increase crime, and poverty ? 
 
 132-4. What are the principal constituents of tobacco ? What are 
 the physiological effects of tobacco ? Who are most likely to escape 
 injury? Is tobacco a food ? What is its influence upon youth? Why 
 are cigarettes specially injurious? Name illustrations of the injurious 
 effect of tobacco on young men. 
 
 135-6. How is opium obtained? What is its physiological effect? 
 Can one give up the use of opium when he pleases ? What is the 
 danger in its use? 
 
 136-7. What is the harmful influence of chloral hydrate? Of chloro- 
 form ? 
 
 THE SPECIAL SENSES. 
 
 139. NAME the five senses. To what organ do all the senses minis- 
 ter? If the nerve leading to any organ of sense be cut, what would be 
 the effect? Sometimes persons lose feeling in a limb, but retain mo- 
 tion ; why is this? What is the sense of touch sometimes called? 
 Describe the organ of touch. What are the papillae? Where are they 
 most abundant? What are the uses of this sense? What special 
 knowledge do we obtain by it ? Why do we always desire to handle 
 anything curious? 
 
 140. Can the sense of touch always be relied upon? Illustrate. 
 Tell how one sense can take the place of another. Give illustrations 
 of the delicacy of touch possessed by the blind. 
 
 141. Describe the sense of taste. How can you see the papillae 
 of taste? What causes the velvety look of the tongue? Why do salt 
 and bitter flavors induce vomiting? Why does an acid "pucker" the 
 face? What substances are tasteless? Illustrate. Has sulphur any 
 
182 QUESTIONS FOR CLASS USE. 
 
 taste? Chalk? Sand? What is the use of this sense? Does it not 
 also add to the pleasures of life ? Why are the acts of eating, drinking, 
 etc., thus made sources of happiness? 
 
 142. Describe the organ of smell. Must the object to be smelled 
 touch the nose? What are the uses of this sense? Are agreeable 
 odors healthful, and disagreeable ones unhealthful ? 
 
 143. Describe the organ of hearing. Describe the external ear. 
 What is the tympanum or drum of the ear? Describe the middle ear. 
 Name the bones of the ear. Describe their structure. Describe the 
 internal ear. By what other name is it known ? What substances 
 float in the liquid which fills the labyrinth? Describe the fibers of 
 Corti. What do they form ? How are the vibrations of the air modi- 
 fied before they reach the nerve ? Give the theory of sound. What 
 advice is given concerning the care of the ear? How can insects be 
 removed ? 
 
 145. Describe the eye. Name the three coats of which it is com- 
 posed. What is the object of the crystalline lens? Describe the 
 liquids which fill the eye. What is the pupil ? Describe the eyelids. 
 Why is the inner side of the eyelid so sensitive ? What is the use of 
 the eyelashes ? Where are the oil glands located ? What is their use ? 
 Describe the lachrymal gland. The lachrymal lake. What causes the 
 overflow in old age ? Explain the use of the rods and cones. What is 
 the blind spot ? Illustrate. What is the theory of sight ? Illustrate. 
 State the action of the crystalline lens. Its power of adaptation. Cause 
 of near-sightedness. How remedied ? Cause of far-sightedness ? How 
 remedied ? Do children ever need spectacles? What is the cataract? 
 How cured ? What care should be taken of the eyes? Should one 
 constantly lean forward over his book or work ? What special care 
 should near-sighted children take? By what carelessness may we 
 impair our sight ? Should we ever read or write at twilight ? What is 
 the danger of reading uoon the cars ? What course should we take 
 when objects get into the eye? How may they be removed? Are 
 "eye-stones" useful? Why we should never use eye-washes except 
 upon the advice of a competent physician ? What care should be taken 
 with regard to the direction of the light when we are at work ? 
 
GLOSSARY. 
 
 AB DO'MEN (abdo, I conceal). The largest cavity in the body, in which 
 are hidden the intestines, stomach, etc. 
 
 AB SORB'ENT (ab, from ; sorbeo, I suck up). 
 
 AC'E TAB'U LUM (acetum, vinegar). The socket for holding the head of 
 the thigh-bone, shaped like an ancient vinegar vessel. 
 
 A CET'IC (acetum, vinegar). 
 
 AD' i POSE. Fatty. 
 
 AL BU'MEN (albus, white). A substance resembling the white of egg. 
 
 AL BU'MI NOUS substances contain much albumen. 
 
 AL/I MENT'A RY. Pertaining to food. 
 
 AI/KA LINE (-1m) substances neutralize acids. 
 
 AN'JES THET'IC. A substance that destroys the feeling of pain. 
 
 A OR/TA. The largest artery of the body. 
 
 AP'O PLEX Y (-plek-se). A disease marked by loss of sensation and vol- 
 untary motion. 
 
 A'QUE ous (a'-kwe-us). Watery. 
 
 A RACH'NOID (arachne, a spider ; eidos, form). A membrane like a 
 spider's web covering the brain. 
 
 AR'BOR VI'TLE means "the tree of life." 
 
 AR'TER Y (aer, air; tereo, I contain). So named because after death the 
 arteries contain air only, and hence the ancients supposed them to be air- 
 tubes leading through the body. 
 
 AR TIC'U LATE (articulo, I form a joint). AR TIC'U LA TIOX. A joint. 
 
 As PHYX'I A (-fix'-e-a). Literally, no-pulse ; apparent death. 
 
 As SIM' i LA'TION is the process of changing food into flesh, etc. 
 
 AT' LAS. So called because, as in ancient fable the god Atlas supported 
 the globe on his shoulders, so in the body this bone bears the head. 
 
 AU'DI TO RY NERVE. The nerve of hearing. 
 
 AU'RI OLE (auris, ear) of the heart. So named from its shape. 
 
 BI'CEPS. A muscle with two heads, or origins. 
 
 Bi CUS'PID. Tooth with two points ; also a valve of the heart. 
 
 BRON'CHI (-ki). The two branches of the wind-pipe. 
 
 BRON'CHI AL TUBES. Subdivisions of bronchi. 
 
 BUR SA (a purse). Small sac containing fluid near a joint. 
 
184 GLOSSARY. 
 
 CA NINE' (canis, a dog) teeth are like dogs' teeth. 
 CAP'IL LA RIES (capillus, a hair). A system of tiny blood-vessels. 
 CAR' BON. Pure charcoal. 
 
 CAR BON'IC ACID. A deadly gas given off by the lungs, and by fires. 
 CA ROT' IDS (karos, lethargy). Arteries of the neck, so named because 
 the ancients supposed them to be the seat of sleep. 
 CAR' PUS. The wrist. 
 CAR'TI LAGE. Gristle. 
 
 CELL. A minute sac, usually with soft walls and fluid contents. 
 CEL'LU LAR (cellula, a little cell). Full of cells. 
 CER'E BEL'LUM. The little brain. 
 CER'E BRUM. A Latin word meaning brain. 
 CER'VI CAL. Relating to the neck. 
 CHLO'RAL (klo) HY'DRATE. A drug used to induce sleep. 
 CHO'ROID. The second coat of the eye. 
 CHYLE (kile). A milky juice formed in digestion. 
 CHYME (kime). From chumos, juice. 
 
 CIR'CU LA'TION. The course of the blood through the body. 
 CIL'I A (the plural of cilium, an eyelash). Hair-like projections in the air- 
 
 CLAV'I CLE (klav-i-kl). From clavis, a key. 
 Co AG'U LA'TION. A clotting of blood. 
 COC'CYX (a cuckoo). A bony mass below the sacrum. 
 COCH'LE A. A Latin word meaning snail shell. See Ear. 
 COM' POUND. A substance composed of two or more elements. 
 CON TA'GI ous diseases are those caught by contact, the breath, etc. 
 CON'TRAC TIL'I TY (con, together ; traho, I draw). 
 CON'VO LU'TION (con, together ; volvo, I roll). 
 
 COR'NE A (cornu, a horn). A transparent, horn-like window in the eye. 
 COR' PUS CLE (kor'-pus-l). From a Latin word meaning a little body. It 
 is applied to the disks of the blood. 
 CRA'NI AL. Relating to the skull. 
 CRYS'TAL LINE (crystallum, a crystal). 
 Cu TA'NE ous (cutis, skin). Pertaining to the skin. 
 CU'TI CLE (ku'ti kl). From a Latin word meaning little skin. 
 CU'TIS, the true skin. 
 
 DEN'TAL (dens, dentis, a tooth). 
 
 DI'A PHRAGM (-fram). The muscle dividing the abdomen from the chest 
 
 Dr AS'TO LE (diastello, I put asunder). Dilation of the heart. 
 
 DIS'LO CA'TION. A putting out of joint. 
 
 DOR'SAL (dorsum, the back). 
 
 DUCT. A small tube. 
 
 Du o DE'NUM (duodeni, twelve each). 
 
GLOSSARY. 185 
 
 DU'RA MA'TER (duriis, hard ; mater, mother). The outer membrane of 
 the brain. 
 
 DYS PEP'SI A is a difficulty of digestion. 
 
 E LIM'I NATE. To expel. 
 
 EP'I DEM'IC. A disease affecting a great number of persons at once. 
 EP'I DERM'IS. The cuticle. 
 
 EP'I GLOT'TIS (epi, upon ; glottis, the tongue). The lid of the wind-pipe. 
 EP'I THE'LI UM. The outer surface of mucous or serous membranes. 
 Eu STA'CHI AN (yu-sta'ki-an) TUBE. So named from its discoverer, an 
 Italian physician. 
 
 Ex CRE'TION. Waste particles thrown off by the excretory organs. 
 FER'MEN TA'TION. The process by which sugar is turned into alcohol. 
 FI'BRIN (fibra, a fiber). 
 FIL'A MENT (filum, a thread). 
 FUNC'TION. See Organ. 
 
 GAN'GLI ON (gang'-gli-on). From ganglion, a knot ; plu. ganglia. 
 GAS'TRIC (gaster, stomach). 
 
 GLANDS (glandz). From glans, a Latin word meaning acorn. Their ob- 
 ject is to secrete in their cells some liquid from the blood. 
 GLOT'TIS. The opening at the top of the larynx. 
 
 HU'ME RUS. The arm-bone. 
 
 HU'MOR. A Latin word meaning moisture. 
 
 HY'DRO GEN. The lightest gas known, and one of the elements of water. 
 
 HY'GI ENE. From a Greek word meaning health. 
 
 HYP'O GLOS'SAL. Literally " under the tongue "; a nerve of the tongue. 
 
 IN CI'SOR (incido, I cut) teeth are cutting teeth. 
 IN'SPI RA'TION (in and spiro, I breathe in). 
 IN TES'TINE (-tin). From intus, within. 
 
 LACH'RY MAL (lachryma, a tear). Pertaining to tears. 
 LAC'TE AL (lac, lactis, milk). So called from the milky look of the chyle 
 during digestion. 
 
 LA CU'NA, plu. lacunae (lakos, a hole). Cavities in the bone-structure. 
 
 LAR'YNX (lar-mx). The upper part of the wind-pipe. 
 
 LIG'A MENTS (ligo, I bind) tie bones together. 
 
 LU'BRI GATE. To oil in order to prevent friction. 
 
 LUM'BAR (lumbus, a loin). Pertaining to the loins. 
 
 LYMPH (limf ). From lym,pha> pure water. 
 
 LYM PHAT'IC (lim-fat'-ik). 
 
 MAS'TI CA'TION. The act of che\ving. 
 
 ME DUL'LA OB LON GA'TA. The upper part of the spinal cord. 
 
186 GLOSSARY. 
 
 MEM'BRANE. A thin skin, or tissue. 
 
 MES'EN TER Y. The membrane by which the intestines are fastened to 
 the spine. 
 
 MET 7 A CAR'PAL (meta, after ; karpos, wrist). 
 
 MET' A TAR'SAL (meta, after ; tarsos, the instep). 
 
 Mr'cRO SCOPE (mikros, small ; skopeo, I see). 
 
 MO'LAR (mola, a mill) teeth are the grinders. 
 
 MOR'PHINE (Morpheus, the Greek god of sleep). 
 
 Mo' TO RY. Giving motion. 
 
 Mu'cous (-kus) MEMBRANE. A thin tissue, or skin, covering the open 
 cavities of the body. See Serous. 
 
 Mu'cus. A fluid secreted by a membrane and serving to lubricate it. 
 
 MUS'CLE (mils' si). A bundle of fibers covered by a membrane. 
 
 MY O'PIA (muo, I contract ; ops, the eye). 
 
 NAR COT' ic. A drug producing sleep. 
 
 NA'SAL (na'-zle). From nasus, the nose. 
 
 NERVE (neuron, a cord). 
 
 NI'TRO GEN GAS is the passive element of the air. 
 
 Ni TROG'E NOUS. Containing nitrogen. 
 
 Nu TRI'TION. The process by which the body is nourished. 
 
 (E SOPH'A GUS (e-sof'-a-gus). The gullet ; literally, a " food- carrier. " 
 OL FAC'TO RY. Pertaining to the smell. 
 
 OR'GAN. An organ is a portion of the body designed for a particular use, 
 which is called its function ; thus the heart circulates the blood. 
 Os' SE ous (-us). Bone-like. 
 Os'si FT (ossa, bones ; facio, I make). 
 Ox i DA'TION. The process of combining with oxygen. 
 OX'Y GEN. The active element of the air. 
 
 PAL' ATE (palatum, the palate). Roof of the mouth. 
 
 PAN'CRE AS (pas, all ; kreas, flesh). An organ of digestion. 
 
 PA PIL'LA, plu. papillae. Tiny cone-like projections. 
 
 PA RAL'Y sis. A disease in which one loses sensation, or the power of 
 motion, or both. 
 
 PA ROT' ID (para, near ; ous, otos, ear). One of the salivary glands. 
 
 PA TEL'LA (a little dish). The knee-pan. 
 
 PEC' TO RAL. Pertaining to the chest. 
 
 PEP'SIN (pepto, I digest). The chief constituent of the gastric juice. 
 
 PER'I CAR'DI UM (peri, around ; kardia, the heart). The membrane 
 wrapping the heart. 
 
 PER'I OS'TE UM (peri, around ; osteon, bone). The membrane around the 
 bone. 
 
GLOSSARY. 187 
 
 PER' i STAL'TIC (peri, round ; stallcin, to arrange). Applied to the 
 worm-like movement of the alimentary canal. 
 
 PHAR'YNX (faVinx). From pharugx, the throat. 
 
 Pi' A MA'TER (tender mother). See Brain. 
 
 PIG'MENT. A paint. 
 
 PLAS'MA (plaz'-mah). The nutritious fluid of the blood. 
 
 PLEU'RA (plu'-rah). From pleura, a rib. The membrane that lines the 
 chest and wraps the lungs. 
 
 PRES BY O'PI A (presbus, old ; ops, the eye). A defect in the eye com- 
 mon to old age. 
 
 PROG' ESS. A projection. Sometimes it retains its ordinary meaning of 
 "operation." 
 
 PY LO'RUS (a gate). The doorway through which the food passes from 
 the stomach. 
 
 PUI/MO NA RY (pulmo, the lungs). Pertaining to the lungs. 
 
 RA'DI us. A Latin word meaning the spoke of a wheel, a ray, etc. 
 RAM' i FY. To spread like the branches of a tree. 
 RES'PI RA'TION (re, again ; spiro, I breathe). Act of breathing. 
 RET' i NA (rete, a net). The expansion of the optic nerve in the eye. 
 
 SA'CRUM (sacred). So named, it is said, because this bone of the pelvis 
 was anciently offered in sacrifice. 
 
 SA LI'VA. A Latin word meaning spittle ; the fluid secreted by the sali- 
 vary glands. 
 
 SCAP'U LA. The shoulder-blade. 
 
 SCAV'EN GER. A street-sweeper. 
 
 SOLE ROT'IC (skle-rot'ic). The outer coat of the eye. 
 
 SE CRE'TION (secretum, to separate). 
 
 SED'EN TA RY persons are those who sit much. 
 
 SEN' so RY NERVES. The nerves of feeling. 
 
 SE'ROTJS MEMBRANE. A thin tissue, or skin, covering the cavities of the 
 body that are not open to the external air. 
 
 SE'RUM. The thin part of the blood. 
 
 SUB CLA'VI AN. Located under the clavicle. 
 
 SUB LIN'GUAL (sub, under ; lingua, the tongue). The salivary gland 
 located under the tongue. 
 
 SUB MAX'IL LA RY (sub, under ; maxilla, jaw-bone). The salivary gland 
 located under the jaw. 
 
 SYN o' vi A (sun, with ; oon, egg). A fluid that lubricates the joints. 
 
 SYN o'vi AL MEMBRANE packs the joints. 
 
 SYS'TO LE (sustello, I contract). Contraction of the heart. 
 
188 GLOSSARY. 
 
 TEM'PO RAL. An artery on the temple (tempus, time), so-called because, 
 as is said, the hair whitens tirst at that point. 
 
 TEN'DONS (tendo, I stretch). The cords conveying motion from the 
 muscle to the bone. 
 
 THO'RAX (a breast-plate). The cavity containing the lungs, etc. 
 
 TIB'I A. The shin-bone. 
 
 TIS'SUE. A general term applied to the textures of which the different 
 organs are composed ; osseous tissue forms bones. 
 
 TRA'CHE A (tra'-ke-a). Means rough, alluding to the roughened surface 
 of the windpipe. 
 
 TRI'CEPS. A muscle with three heads, or origins. 
 
 TRI CUS'PID (tres, three ; ctispis, point). A valve of the heart. 
 
 TYM'PA NUM (a drum) of the ear. 
 
 VAS'CU LAR (vasculum, little vessel). Full of small blood-vessels 
 VEN'TRI CLE (-kl). A cavity of the heart. 
 
 VER'TE BRA, plu. vertebrae (verto, I turn). A term applied to each one 
 of the bones of the spine. 
 
 VIL/LUS (villus, tuft of hair), plu. villi. 
 VIT'I ATE. To taint. To spoil. 
 VIT'RE ous (vitrum, glass). Glassy. 
 VO'MER (plowshare). A bone of the nose. 
 
INDEX. 
 
 PAGE 
 
 ABDOMEN 54 
 
 Absorbing power of skin 79 
 
 Absorption of food 99 
 
 Air, The 56 
 
 Albumen 92 
 
 Alcohol 81, 106, 127 
 
 " as a Narcotic 85 
 
 " Cause of Degeneration 85 
 
 Effect upon Blood 87 
 
 " " Brain 129 
 
 " " Circulation 83 
 
 ' " " Digestion 108 
 
 " " " Heat of body... no 
 
 " " Heart 84 
 
 <k " Kidneys 109 
 
 " " Liver 109 
 
 " " Lungs 88 
 
 " " " Membrane 86 
 
 *' ' Mental Powers. 130 
 
 ' " Muscle in 
 
 u " Nervous System 127 
 
 " Waste HI 
 
 Alcoholism 112 
 
 Alimentary canal 94 
 
 Antidotes for poison Appendix 
 
 Aorta '. 75 
 
 Apoplexy Appendix 
 
 Arteries 72 
 
 Asphyxia Appendix 
 
 Atlas 16 
 
 Auricles of the heart 70 
 
 Axis 16 
 
 BALL-AND-SOCKET-JOINT 19 
 
 Bathing 43 
 
 Beef I0 i 
 
 Bicuspid valve 72 
 
 PAGE 
 
 Bile 98 
 
 Bleeding, Checking of .. 79 
 
 Blood, The 67 
 
 Blushing 79 
 
 Bones, The n 
 
 Bow-legs 22 
 
 Brain J... 115 
 
 " Exercise 124 
 
 Bread 101 
 
 Breast-bone 17 
 
 Breathing 53 
 
 Bronchi 53 
 
 Burns Appendix 
 
 CANAL, Alimentary 94 
 
 Capillaries 73 
 
 Carbonic acid 56 
 
 Carbonaceous food 92 
 
 Cartilage 12 
 
 Cataract 151 
 
 Cerebellum n3 
 
 Cerebrum 117 
 
 Change of our bodies 77 
 
 Cheese IOE 
 
 Chilblain 47 
 
 Chloral hydrate 136 
 
 Chloroform.... 137 
 
 Choking Appendix 
 
 Chyle 99 
 
 Chyme 96 
 
 Cilia, The 53 
 
 Circulation 67 
 
 Clavicle 18 
 
 Clothing 45 
 
 Coagulation of Blood 68 
 
 Coffee 102 
 
 Cold, A 80 
 
190 
 
 INDEX. 
 
 PAGE 
 
 Color Blindness 151 
 
 Complexion, The 36 
 
 Congestion 79 
 
 Connective tissue 38 
 
 Consumption 65 
 
 Corns 46 
 
 Corpuscles (Cells) 67 
 
 Cortian fibers 144 
 
 Cosmetics 79 
 
 Coughing 55 
 
 Croup 65 
 
 Crying 55 
 
 Crystalline lens 146 
 
 Curvature of the spine 23 
 
 Cuticle, The 35 
 
 Cutis, The 35 
 
 DEGENERATION, FATTY 85 
 
 Delirium Tremens 130 
 
 Diaphragm 53 
 
 Digestion 91 
 
 Diphtheria ... 65 
 
 Disinfectants Appendix 
 
 Dislocation 23 
 
 Drinking- water Appendix 
 
 Drowning Appendix 
 
 Duodenum 98 
 
 Dyspepsia 106 
 
 EAR, The 143 
 
 Eating, Rapid 102 
 
 Eggs ioi 
 
 Elbow, The 19 
 
 Epiglottis 49 
 
 Epilepsy Appendix 
 
 Eustachian tube 144 
 
 Exercise, Muscular 3 1 
 
 " Brain - 124 
 
 Expiration 53 
 
 Eye, The 146 
 
 " Muscles of the 28 
 
 FAR-SIGHT 150 
 
 Fats, The 39, 92 
 
 Femur .. 21 
 
 PAGE 
 
 Fever Appendix 
 
 Fibrin 68 
 
 Fibula 21 
 
 Fish ioi 
 
 Flannel 45 
 
 Food, Absorption of 99 
 
 " Cooking of 103 
 
 " Digestion of 93 
 
 Need of . . . 91 
 
 Foot, The 22 
 
 Frost-bite Appendix 
 
 GALL-BLADDER (cyst) 54, 98 
 
 Ganglion, A nerve 115 
 
 Gastric-juice 96 
 
 Glottis 49 
 
 Glycogen 98 
 
 Gout, The 33 
 
 Gristle 12 
 
 HAIR, THE 36 
 
 Hair-dyes 37, 79 
 
 Hand, The 20 
 
 Head 14 
 
 Hearing 143 
 
 Heart 69 
 
 Heat of Body 76 
 
 Heredity 112 
 
 Hiccough 55 
 
 Hinge-joints 19 
 
 Hip, The 17, 21 
 
 Humerus 19 
 
 INFLAMMATION 79 
 
 Innominata 18 
 
 Inspiration 53 
 
 Intestines, The 54 
 
 Jon 
 
 OINTS 
 
 KNEE, The .......................... 21 
 
 LABYRINTH, The ....... ............ 144 
 
 Lachrymal glands ................... 147 
 
 Lacteals ........................... 100 
 
 Larynx ....... ...................... 49 
 
INDEX. 
 
 191 
 
 PAGE 
 
 Laughing 55 
 
 Life by death 76 
 
 Ligaments 13 
 
 Liver 98 
 
 Locked-jaw 33 
 
 Lungs, The 53 
 
 " Constriction of the 64 
 
 Lymphatic system 78 
 
 MARROW 12 
 
 Mastication 94 
 
 Medulla oblongata 122 
 
 Membrane, Uses of 39 
 
 Metacarpal bones 24 
 
 Milk ... ioi 
 
 Mucous membrane 38 
 
 Mucus 38 
 
 Mumps, The 106 
 
 Muscles, The 25 
 
 Muscular sense 30 
 
 Mutton ioi 
 
 NAILS, The 36, 37 
 
 " In-growing 46 
 
 Near-sight 150 
 
 Nerves, The 115,119 
 
 Nervous system, The 115 
 
 Nitrogenous food 92 
 
 Nose, The 142 
 
 CEsophagus 49 
 
 Oil Glands, The 42 
 
 Oils, The 92 
 
 Opium 135 
 
 Ossification , I2 
 
 Oxidation 91 
 
 Oxygen 5 6 
 
 PALATE, The 5 o 
 
 Pancreatic juice 98 
 
 Papillae 37 
 
 Patella, The 21, 29 
 
 Pelvis, The , 7 
 
 Pepsin 96 
 
 PAGE 
 
 Pericardium 7o 
 
 Perspiration, The 43 
 
 Pharynx 50 
 
 Pigment 36 
 
 Plasma 6 7 
 
 Pleura 53 
 
 Pneumonia 65 
 
 Poisons Appendix 
 
 Pork I0 i 
 
 Potatoes 102 
 
 Pulmonary arteries 7 4 
 
 " veins 75 
 
 Pulse 73 
 
 Pylorus 96 
 
 RADIUS 19 
 
 Reaction 44 
 
 Reflex action 123 
 
 Respiration 53 
 
 Rheumatism 33 
 
 Ribs, The 16 
 
 Rickets, The 22 
 
 SACRUM, The i3 
 
 St. Martin, Alexis 100 
 
 St. Virus's Dance 33 
 
 Saliva, The 94 
 
 Salt 93 
 
 Scapula 18 
 
 Scrofula 80 
 
 Sea-bathing 45 
 
 Secretion, Definition of 95 
 
 Semi-lunar valves 72 
 
 Senses, The 139 
 
 Serum 68 
 
 Shoulder, The 18 
 
 Sick, Care of Appendix 
 
 Sight, Sense of 145 
 
 Skeleton, The n 
 
 Skin, The 35 
 
 Skull, The 14 
 
 Sleep 125 
 
 " by medicine 125 
 
 Smell, Sense of 142 
 
192 
 
 INDEX. 
 
 PAGE 
 
 Sneezing 55 
 
 Snoring 55 
 
 Speech 52 
 
 Spinal cord 119 
 
 " nerves. 120 
 
 Spine, The 15 
 
 Spleen 94 
 
 Sprain 23 
 
 Squinting 151 
 
 Stammering 65 
 
 Sternum , 17 
 
 Stomach 55 
 
 Sugars, The 92 
 
 Sunlight ... 191 
 
 Sunstroke Appendix 
 
 Sutures 14 
 
 Sweat < 3 
 
 Swimming 31 
 
 TARTAR 42 
 
 Taste, Sense of 141 
 
 Tea 102 
 
 Tears, The 147 
 
 Teeth, The 40 
 
 Temperature of the body 75 
 
 Tendons 26 
 
 Thoracic duct 78 
 
 Throat 49 
 
 Tibia 21 
 
 Tight-lacing 64 
 
 PAGE 
 
 Tobacco 132 
 
 Tongue, The 141 
 
 Tooth-ache, The Appendix. 
 
 Touch, Sense of 139 
 
 Trachea 53 
 
 Tricuspid valve 72 
 
 Tympanum 143 
 
 ULNA, The 19 
 
 Urea, Uric Acid 98 
 
 VALVES of heart and veins 71, 7 3 
 
 Veins, The 73 
 
 Velocity of the blood 76 
 
 Vena cava (Plu., venae cavx) 75 
 
 Ventilation 57 
 
 Ventricles. : 70 
 
 Vertebrae 15 
 
 Villi of intestine 100 
 
 Vocal cords 49 
 
 Voice, The 51 
 
 WALKING 30 
 
 Warts 46 
 
 Washing 43 
 
 Water 93 
 
 Windpipe 52 
 
 Woolen . , 45 
 
 Worms 42 
 
 Woundo Appendix 
 
 Wrist, The 19 
 

 
 p f 
 
 Tb 36! 12 
 
 
 UNIVERSITY OF CALIFORNIA LIBRARY