} ' ' Gt.Brit. Board of .edaoation. SChe hygiene of food ina drink. London, 19 20 • tf-r,, ."v/s jfr. i j ' ir fv y yi r- w*ts*r *> ? -m ii fJfHY ** k 8^ f4 "i givt theft Books 1 for the founding of a. College in, this Colony" e YAUE °WMP/iEI&Slir - ILMBMIEF . I r. 1 1 TRANSFERRED TO YALE MEDICAL LIBRARY BOARD OF EDUCATION. THE HYGIENE OF POOD AND DRINK. A Syllabus of Lessons,; for use in Schools, and Notes for the Assistance of Teachers. LONDON: PUBLISHED BY HIS MAJESTY'S STATIONERY OFFICE. To be purchased through any Bookseller or directly from H.M. STATIONERY OFFICE at the following addresses: Imperial House, Kingsway, London, W.C. 2, and 28, Abingdon Street, London, S.W. 1; 37 Peter Street, Manchester; l, St. Andrew's Crescent, Cardiff; 23, Forth Street, Edinburgh; or from E. PONSONBY, Ltd., 116, Grafton Street Dublin. 1920. Price 2d. Net. 2 THE HYGIENE OF FOOD AND DRINK. A Syllabus of Lessons for use in Schools. PREFATORY NOTE. 1. A "Temperance" Syllabus was first issued by the Board of Education in 1909 and was subsequently reprinted without substantial alteration in 1916. In view of the advance in the knowledge of the subject since that date, it is considered that the present time is opportune for a complete revision, relating, the Syllabus generally to the Hygiene of Food and Drink, including alcohol. In addition, a section has been added on the misuse or abuse of food and its results. In this section an attempt has been made to provide the teacher with some practical notes on which he will be able to base his instruction on the effects of under-feeding, of over-feeding, and of wrong feeding. The question of the misuse of food and its abuse is not less important than the question of the abuse of alcohol, and there is little doubt that the- two subjects should be dealt with in a proper and well balanced relation. Sections III. and IV. are interdependent. Section II. has been based on the con¬ clusions of the Advisory Committee on Alcohol of the Central Control Board.* 2. The Board have not hitherto recommended that " Tem¬ perance" should be regarded as a separate and distinct subject of the curriculum, but that it should form a part of the general instruction given to children from time to time on the art of healthful living. The Board, however, consider that, in view of the more important and comprehensive character of this Syllabus, Local Education Authorities should take such steps as are practicable to give it an appropriate place in the curriculum of the schools for which they are responsible, whether the instruction is given by members of the ordinary school staff or by specially appointed teachers of Hygiene. Less formal instruction should still continue to be given at appropriate times, and opportunities for such instruction will be found to arise incidentally in connection with a variety of subjects ; in * See " Alcohol: Its Action on the Human Organism " (published by His Majesty's Stationery Office, 1920, price Is. to be obtained direct from Imperial House, Kingsway, or through any bookseller). It is strongly recommended that this Report should be read by everyone engaged in teaching the subject of " Temperance." Prefatory Note. 3 the Science course ; in the History lesson in connection with the social life of the people ; in the Geography lesson when the influence of climate is being explained ; or, perhaps, during the periods of rest in the course of the Physical Exercises, or in connection with organised games or " training " for sports, &c. 3. Though it is considered useful and appropriate to take every suitable opportunity of presenting the subject of Tem¬ perance to children, the teacher should be constantly on his guard against making categorical statements or drawing inferences that are not supported by facts fully substantiated by present scientific knowledge. It is, of course, important that the teaching given should be acceptable and interesting to the pupils. But since the subject is peculiarly apt to be coloured by personal predilections and prejudices, the accom¬ panying Syllabus has been framed as a " model" for the guidance of teachers, whether members of a School Staff or otherwise, and the Board of Education are of opinion that, in the absence of exceptional circumstances, special care should be taken to follow the lines of the Syllabus. 4. The statement of facts now made has been prepared after much consideration and is accepted by leading physiologists. The Notes on the Syllabus are intended for the information and guidance of teachers and not for mere reproduction to the children. Every attempt should be made to avoid the use of technical terms and the practice of building a lesson round them should be rigidly excluded. The lesson should take the form, of a simple, practical and, above all, a sincere talk to the children. The appeal should be to their common sense and not to their emotions or their fears, and therefore emphasis should be laid not so much on the dangers arising from the non- observance of the laws of health as on the fitness and well-being which follows their observance. 5. It is perhaps hardly necessary to state that the one idea that should dominate any1" Temperance" teaching is the paramount importance of self-discipline. A healthy life depends mainly on consistently good habits and the apprecia¬ tion and practice of a few simple and direct laws of health. The inculcation of such principles is, in the case of children, almost entirely a question of sound training. The wise teacher will lose no opportunity of impressing upon his scholars the vital importance of habits of self-control and it will be his constant aim to afford plain, simple and satisfying reasons which the child will understand and appreciate. 6. The more advanced pupils may usefully be instructed as to the positive risks and dangers of any form of excess ; and, conversely, the far-reaching advantages of self-control should be emphasised, not only from a moral point of view, but from the point of view of practical expediency and personal comfort. While such teaching should be forceful and incisive, the advice A (36)11649 Wt 10610—908 7500 7/20 E & S A 2 4 Prefatory Note. or injunctions given should be based upon the broad facts of common experience. The general findings of trained observers as to the effect of alcohol on mental and physical work may also appropriately be discussed ; but the results of laboratory experiments or pathological investigations are not, per se, of primary value for this purpose. They may sometimes be found useful in illustrating the teaching of Hygiene to advanced students but can have little real meaning to children. Finally, and above all, the subject should be dealt with in a dispassionate manner and should be made to appeal to the child's reasoning capacity and to his common sense. Whitehall, London, S.W., July, 1920. SYLLABUS. Section I. THE USES OF FOOD AND DRINK. 1. What things do we eat? 2. The different kinds of food. (а) Bodv-bnilding foods, including meat and fish; milk, cheese and eggs ; pulse foods, such as peas, beans and lentils. (б) Energy and warmth-producing foods, including fat (butter, margarine, dripping, cream), foods com¬ posed principally of starch (potatoes, rice, tapioca). (c) Rurifying foods, such as vegetables and fruits, valu¬ able for the salts, acids and vitamines they contain. Water in food. 3. What is the use of our food ? Why food is necessary. (а) Food is necessary for the growth of the body. (б) Food should prevent the body from becoming thin and wearing away. It repairs waste. (c) It is from food that we get our strength and power to work. (d) It is by our food that the body is kept warm. (ie) The working of the mind depends upon the condition of the body. If the body is not properly fed the mind will not work so well. 4. The special usefulness of the different kinds of food. 5. Why people eat various kinds of food, and why they are wise to do so. 6. Things which people eat and drink for pleasure. Sweets, cakes, tea, coffee and cocoa. The value of each. Why people drink tea and coffee. A 11649 6 The Hygiene of Food and Drink : Section II. ALCOHOL. 1. Beer, wines, and spirits are not useful in the ways in which our ordinary food, and such things as cocoa and milk, are useful. People often do themselves great harm by taking beer, wine, and spirits. The chief reason for this is that these beverages contain Alcohol and little or no real food substance. 2. What is Alcohol ? 3. Some characteristics and uses of " pure " Alcohol. 4. The proportion of Alcohol in beer, wine, and spirits. It is not possible to drink Alcohol undiluted, because of the direct inj ury and pain it would produce. The harmful effects of Alcohol are weakened, though not destroyed, when it is mixed with water and other things, as in alcoholic beverages. 5. Effect of Alcohol on the brain and nervous system. 6. Effect on the body's strength and power to work. 7. Effect on the power of the body to resist disease. 8. Effect on the digestion of food. 9. Effect on the body temperature. A Syllabus of Lessons for Use in Schools. 7 Section III. THE MISUSE AND ABUSE OF FOOD AND ITS RESULTS. 1. Principles which must be observed if errors of diet are to be avoided. Diet should be mixed, varied, sound in quality and sufficient in quantity ; appetising and digestible. Necessity for adequate supply of protein, fat, carbo¬ hydrates, salts, vitamines, water. Value of fat in cold weather. Limited value of dried foodstuffs, preserved vegetables, tinned meats. 2. The consequences of eating too much. Object of eating should be to secure (a) health of the body, (b) development and growth, (c) repair and vital energy. Ill-effects of over-eating—pain, headache, sickness, vomiting ; accumulation of too much fat in the body ; strain on the action of the muscles, especially of the heart; overworking of the organs of excretion. Avoidance of spiced, rich foods. 3. Importance of taking food at fairly regular intervals. Food taken* between meals interrupts process of digestion. 4. The consequences of taking food which is unsuitable to the age or habits of the individual. Appetite not always a safe guide. Constant eating of sweets tends to destroy the teeth. 5. Malnutrition. Caused by insufficient food, unsuitable food, over¬ eating, defective digestion and assimilation. t). Prevention of diseases due to faulty feeding. Habits to be avoided. The Hygiene of Food and Drink. Section IV. THE MISUSE AND ABUSE OF ALCOHOL. 1. For different reasons the drinking of alcoholic beverages in excess is likely to be injurious to all parts of the body, and renders those who do so less fit and healthy. This tends to shorten life and also produces mental apathy, carelessness, and the loss of due control over the muscles. 2. Facts revealed by a study of mortality tables. Comparative mortality in certain occupations. 3. Facts revealed by a study of the experience of the principal life offices and friendly societies. Increased expectation of life among " abstainers." 4. The social effects of drinking to excess are not confined to the injury done to the body, but also may be followed by moral injury. (а) Loss of self-control; loss of freedom; moral weakness. (б) Unfitness for work; loss of employment; pauperism. (c) Ill-health ; disease ; insanity. (d) Neglect of duty ; moral degradation ; crime. 5. The wastefulness of the excessive drinking of alcoholic beverages. Nation's drink bill. Waste of money which could be wisely spent or saved. The value of thrift. The ruin of homes; unhappiness, suffering, cruelty and brutality may result. The working powers of the people as a whole are impaired, and so the prosperity of the nation itself is undermined. G. Prevention of the evils arising from alcoholic excess— (а) Total abstinence ; (б) State action. Contributory factors ; international competition. Notes on Syllabus. 9 NOTES ON SYLLABUS# Section I. 1. What things do we eat. By questioning the class the teacher will readily ascertain a considerable number of foods in common use in the homes of the pupils, e.g., meat, fish, bread, butter, jam, potatoes. 2. The different hinds of food. Generally speaking, foods are capable of classification into three categories:—(a) Body-building foods, including meat and fish; milk, cheese and eggs ; pulse foods, such as peas, beans and lentils. (b) Energy and warmth-producing foods, including fat (butter, margarine, dripping, cream), foods composed principally of starch (potatoes, rice, tapioca, oatmeal), (c) Purifying foods, such_ as vegetables and fruits, valuable for the salts, acids and vitamines they contain. The body-building foods are rich in protein, which is essential for the building up of the tissues of the body. The starchy and sugary foods are composed chiefly of carbohydrates. The body-building foods, though composed principally of protein, contain usually also some carbohydrate or fat, or both, as well as salts ; whilst the energy and warmth-producing foods may contain, besides starch and sugar, a certain amount of protein and fat. Water in food. In addition to solid food the body needs also something liquid. Water is the best fluid to drink, and man cannot exist without it in some form. If a plant is not watered, and is thus allowed to become dry, it will wither and die ; in similar circumstances the human body will also die. Most foods contain a large proportion of water; and some foods, (e.g., jelly), though appearing to be quite solid, consist almost wholly of water. All fruits and vegetables contain it. There is also a considerable quantity in meat. The amount of water in food, however, is not sufficient to maintain health ; it is necessary also to drink, so that food may be dissolved and made liquid. The nourishing part of the food is then in a condition to be absorbed into the blood, through which medium it is distributed to all parts of the body. Food without water would be of little or no use to the body, however good it might be in itself. Other factors. In addition to these constituents of a satisfactory dietary, there are certain accessory food factors known as vitamines which are essential to the maintenance of good health. Little is known as to their physical and chemical properties. Three kinds of vitamines have been discovered. They are all products of the plant world, and when present in animal tissues are always derived from vegetable food. One kind is formed in that part of the seed or grain known as the " embryo " or " germ." When cereal grains are highly milled or polished, the " germ," and therefore the vitamine, is removed with the bran. Hence people who feed mainly on bread made from superfine white flour, or polished rice (as was the case in Japan) often suffer from a painful disease of the nerves, beriberi. A second kind originates in green leaves, and when these are eaten by an animal the vitamine is stored in its fat. Thus the fat in cow's milk contains the vitamine because the cow eats grass. Yegetable * It is not intended that these Notes should be read to the Class or used in such > a way as to overload the teaching with detail. a 5 10 Notes on Syllabus. fats and margarines made from them do not contain it, and thus are of inferior nutritive value to butter. This vitamine is necessary for growth (hence the value of milk and milk products to children) and probably for the prevention of rickets. A third kind is present in fresh vegetables and fruits and is essential for the prevention of scurvy. 3. What is the use of our food ? Why food is necessary. Everything that is eaten is not necessarily " food." To be a real food it should affect the body in one or more of the following ways :— (a) Food is necessary for the growth of the body. It should tend to make the body taller and bigger. Healthy babies and children should grow bigger and heavier, but they cannot do this unless the food they eat is converted into bone and muscle. During serious illness adults become thin, wasted1 and weak ; during convalescence it is necessary for them to eat nourishing food to restore their bodies to normal weight and strength. (b) Food prevents the body from becoming thin and wearing away. If food is not taken for several hours, hunger is felt. Some part of the body is continually wearing away and being used up, somewhat as a candle is used up as it burns or as the parts of an engine wear away with use. "When hunger is felt it indicates a need of food to replace the part of the body that has wasted away. The muscles that are used in doing hard work wear away faster than if they are not required to work, and therefore food is needed before work to provide the extra energy and after work to repair the extra waste. If sufficient food is unobtainable, the body gets thin, so it is evident that food is necessary even if the body is to remain the same size and weight. (c) It is from food that we get strength and power to work. When either body or mind is at work energy is being used up and sooner or later one gets tired, and has no more power to work effectively. Thus, besides rest, food is necessary to repair the wastage. (d) It is by food that the body is kept warm. As the body is, in normal circumstances, warmer than the air, it is constantly tending to cool and to lose heat. When food is taken it is digested and carried by the blood to the tissues where it is stored; the food material thus incorporated then combines with the oxygen which the blood also carries. This process is called oxidation or " combustion." Combustion leads to the formation of heat; so in that slow combustion, which all living things exhibit, heat is pi-oduced. In this way, the heat derived from food replaces the heat lost from the surface of the body, and so maintains a nonnal temperature (e) The working of the mind depends on the condition of the body. The mind cannot work well unless the body is properly fed and warmed, because food serves to strengthen brain as well as body. Just as the body becomes weak and unable to work if it is not fed, so the bi-ain alsp becomes less active if it is not noui-ished. Children who are not propei'ly fed cannot leara their lessons as well as when they are well nourished. It is particularly important that children should have suitable and sufficient food. Under- nourishment in childhood may starve not only the body but also the brain, upon the health, capacity and power of which their life will largely depend. In the adult, under-nourishment and malnutrition lessen physical and mental fitness, power of work and l'esistance to disease. 4. The special usefulness of the different kinds of food. The several kinds of food referred to above are all required by the body, and each kind is of use in its own pai-ticular way. For instance, meat, fish Notes on Syllabus. 11 and eggs help the body to gro w, to become strong and able to work ; to make nrnscle and supply energy and strength. Cheese and milk are useful in the same way. Foods containing sugar, starch and fat enable the body to work and (especially in the case of fat) warm it; but they do not supply the materials needed for its growth and repair. Fat in food is for a time stored in the body, and so produces that condition of plumpness which, if not excessive, gives a feeling of comfort. Fat is a readily combustible food, and when burnt it generates a relatively large amount of heat. It thus forms a reserve which is burnt off when the fuel supplied is inadequate to the demand. Consequently thinness is an early sign of insufficient intake of food. In addition to these foods, it is well to eat fruits and green vegetables, because they, too, help to keep the body healthy. Milk is the type of a " complete " food, and in order to lay the foundation of sound nutrition in infancy an abundant supply of fresh pure milk is essential. It forms for infants a complete diet in itself, the solid part consisting of nearly equal proportions of body-building material (casein), fat (cream), and milk-sugar, with small quantities of a large variety of salts. As children pass from infancy, and are able to take other foods, milk should still form a consider¬ able part of their diet. The purer and richer it is, of course, the more nourishing it is; but for these older childreu even skimmed milk, when it can be obtained fresh and pure, is an excellent body-building food, and may be used with advantage in making milk puddings, &c. But skimmed milk should not be given to infants in any form ; they should have whole milk only, even if it is necessary to dilute it before use. Milk is a fluid which readily becomes contaminated. As it leaves a healthy cow it is free from germs. It is, however, often exposed to dust and dirt at the time of milking, on its way to or at the dairy or milkshop and in the home of the consumer. The bacteria which gain access to the milk are mainly (a) those producing fermentation, (b) those found in sewage, (c) those associated with diseases such as tuberculosis, typhoid fever, diphtheria, and epidemic diarrhoea. To secure a supply of pure milk it is necessary (i) for the cows to be healthy, amid clean surroundings, and free from tuberculosis; (ii) for strict cleanliness to be observed at the time of milking; (iii) for the temperature of the milk to be kept low (by the use of the refrigerator when necessary, and (iv) for protection to be afforded on its way to the consumer against all contamination by dust or dirt. Similarly in the home every care should be taken to protect the milk and to keep it cool. Whenever there is doubt as to the purity of the milk, it should either be boiled or heated to about 180° Fahrenheit for ten to fifteen minutes. The latter is usually sufficient for all practical purposes and makes less alteration than boiling in the com¬ position of the milk. The best brands of condensed milk and dried milk are pure, wholesome and nutritious, but lacking in a certain vital quality, owing mainly to the destruction of vitamines in the process of preparation. Many infants and young children suffer from the lack of sufficient pure milk, whether mothers' milk or cows' milk. This lack is at the root of much of the malnutrition in infancy, is closely associated with the production of rickets, and leads to lack of stamina which renders the child less able to withstand the onset of disease or, when attacked, to recover from infectious or other diseases. For these reasons a much larger supply of good pure milk than is at present given to infants and young children is necessary. 5. Why people eat various hinds of food and why they are wise to do so. It is not good to attempt to live on one kind of food alone. If, for example, only bread and butter is eaten, though there is plenty of starch and fat, it would be necessary to consume a large quantity in order to obtain enough of the body-building substance, protein. Meat furnishes a great deal of protein but no starch. Again, if fresh vegetables or fruit are not included in the diet, illness results for the reason that a sufficiency of vitamines, salts and acids is lacking. It is best to eat a little of a good many different kinds of food. A 6 12 Notes on Syllabus. 6. Things which people eat and drink for pleasure. Besides the food that people eat for their good there are many things which they eat merely because they are pleasant to the palate. Children, for instance, like sweets and cakes, which contain sugar and other pleasant things that are good if not eaten to excess. Sweets eaten between meals tend to spoil the appetite for the other more nourishing food which the body needs. People also drink things because they like them, e.g., tea, coffee, and cocoa. Neither tea nor coffee is a real food ; the only food in tea as it is drunk in this country, is the milk and sugar that is put into it. The difference between milk, for example, and tea lies in the fact that milk gives the body power and strength, whereas tea only stimulates the body to put forth and use the strength it has gained from real food If people drink these things when they are tired, they feel for a short time fresher and more able to work. This is due to substances contained in tea and coffee which temporarily increase the capacity for muscular and mental -work. Thus fatigue is in some degree diminished and not merely obscured; but if tea and coffee are taken too frequently, especially for the purpose of freshening up the body when it is tired, they may be harmful. When the body is tired it does not need stimulants so much as rest and food. Tea should be freshly made and should not be strong. If it is left to stand long after it has been made (unless the tea has been poured off the leaves into another vessel), it soon begins to taste bitter; this is because " tannin " has been dissolved out of the tea-leaves. Besides making the tea taste bitter, the tannin is injurious to the body tissues; it hinders the assimilation of food, sometimes causes indigestion, and may do harm in other ways. Tea should be drunk, therefore, soon after it is made. Tea and coffee are not good for children; they should have milk or cocoa, because they are less stimulating and contain more food substance. Notes on Syllabus. 13 Section II. 1. Beer, Wine, Spirits. There has often been much controversy as to the food value of alcohol. It has already been shown that there are the three main classes of foods and the respective services which each renders to the maintenance of a healthy body have been indicated, viz., that the proteins supply the material for the repair of tissue waste, while carbohydrates and fats provide the necessary fuel for the supply of energy. In considering the food value of alcohol, however, this point requires further explanation. Besides making use of protein for tissue growth and the repair of tissue waste, the body is able to transform some of it also into carbohydrate and thus utilise it as a source of energy. But the supply of an adequate quantity of carbohydrate and fat renders this conversion of protein unnecessary; they act, that is to say, as protein savers. Further, besides furnishing fuel for energy, food can be stored in the body for future use. Carbohydrate is stored mainly in the liver and muscles, but it may be transformed by the body into fat and stored in that form. Alcohol can be utilised by the body as a fuel, and it can act also as a protein saver. It cannot, however, be altered or stored by the body in any way for future requirements, but circulates in the blood for some 15-24 hours, during which period it is very slowly burnt. Thus it is seen, that if taken in large amounts or if taken in moderate amounts too frequently, alcohol exerts a more or less constant action on all the body tissues. In a measure, then, alcohol is rightly classed as a food in that it is able, by helping to supply the immediate requirements of the body, to prevent some depletion of the reserve, but for practical everyday purposes alcoholic beverages cannot be regarded as a source of nourishment. Many people suppose that beer is a real food, and they drink it partly because they think it makes them more able to work. It is true that it contains a certain amount of nourishment, There is, for example, a litt'e sugar and there is a small quantity of the food substance found in meat. To obtain enough food from beer for it to be of serious consequence as a source of energjq however, it would be necessary to take an extremely large quantity, and rhe good that might be done by the nourishing part of the beer would be more than counter-balanced by the harm done by the alcohol contained in so large a quantity. This is one important reason for not taking beer as a food. Another is the expense, for even if no harm were done by the amount of beer which it would be necessary to drink, the cost of such a meal would be far greater than the cost of an equal amount of nourishment taken in the form of ordinary food. For these two reasons, therefore, beer cannot be considered to be one of the " foods " which the body requires. Moreover, alcoholic beverages do not, as a rule, quench thirst as water and tea do; in fact, thirst may be created and increased instead of being satisfied. Children and young people should not drink beer, wine or spirits of any kind. Children do not, as a rule, like the taste of alcohol; in fact, wide experience proves that " alcohol is seldom any temptation to the " young, but nevertheless, the habit may be acquired and become a temp- " tation later."* When in health, the body does not need alcohol, whereas it is always possible that various evils may arise as a consequence of drinking beverages containing it. If alcohol is used regularly, " drinking " habits may not infrequently result, for a mere knowledge of the dangers of alcohol is not a sufficient safeguard. * Life and Labour of the People in London, by Right Hon. Charles Booth (Macmillan), 7s. 6d. Final volume, page 64, 1903. a 11649 a 7 14 Notes on Syllabus. 2. What is Alcohol / * The term alcohol is applied by chemists to a variety of substances - having a certain type of chemical constitution, but in the ordinaxy use of the term it is restricted to what is called " ethylic" alcohol, which is the constituent of all alcohol drinks and is produced by the fermenting action of yeast upon sugar. Thus wine is produced by the fermentation of the sugar in the juice of the grape, cider by the fermentation of that in the apple. The alcohol in beer is produced by the fermentation of malt-sugar, which is produced in the process of brewing, from the action of a ferment on the starch in the barley grain. During the process of fermentation other " alcohols " and similar sub¬ stances are produced, which give rise in the main to the characteristic flavours of the different kind6 of wines and spirits ; but it is the ordinary or " ethylic" alcohol which is responsible for the effects produced by the drinking of alcoholic liquors. 3. Some C liar act eristics and Uses of Pure Alcohol. Pure alcohol is colourless and looks like water, but it has a peculiar smell; also, unlike water, it has not the power to quench thirst. It will burn; hence brandy and whisky, which eontain a great deal, will readily take fire. Alcohol has a greal attraction for water, and if substances containing water are soaked in alcohol, they lose this water and become dry and hard. Alcohol is also able to absorb water from the tissues of the body, and this explains why alcoholic drinks tend to make a man more rather than less thirsty. When the body loses water, whatever the cause of this loss may be, thirst is created and a renewal of the supply of water is necessary. For this reason alcoholic beverages make one thii-sty. These properties of alcohol make it very useful in certain arts and manufactures, and for some industrial purposes. As a fuel, for example, it may be used for spirit lamps or to drive motors. The chemist uses it to prepare and purify drugs and other compounds. It is employed to dry and harden substances ; many ai*ticles and museum specimens are preserved in spirit; and since it is difficult to freeze alcohol, it is used instead of mercury in thermometer's when it is desired to register very low 1 emperatures. 4. Proportion of Alcohol in Beer, Wine and Spirits. It is not possible to drink pure alcohol, because it causes a hot painful feeling in the mouth, throat and stomach, and also produces direct injury. Therefore it can only be taken when diluted and made weaker by mixing it with water or other liquids less harmful than alcohol. Beer, wine and spirits all contain alcohol. There is some in beer, more in most wines, and a great deal in spirits. (It is for this reason that although beer will not burn, brandy will.) The percentage of alcohol by volume in some of the commoner alcoholic beverages may be stated as follows :— Lager beer contains about 4-5 per cent. Bottled beer „ „ 5-7 „ „ Claret, hock, &c. contain about 9-10 per cent. Poi-t contains about 17-23 per cent. "1 Gin contains about 37 per cent. ffepiiits ryy^Lty l „ 40-50 per cent. J Brandy J * The matter contained in this section is based upon the official publication, Alcohol: its Action on the Human Organism, 1920. H.M. Stationery Office. Price Is. f The percentage of alcohol in spirits has been reduced under the Defence of the Realm Act Regulations. Notes on Syllabus. 15 Some of the " medicated wines," sold by chemists and others, contain a large percentage of alcohol, and, for this reason, harm may be done by their use as "tonics." 5. Effect of Alcohol on the Brain and Nervous System. Contrary to popular opinion, the effect of alcohol on the nervous system is to depress rather than to stimulate its functions. The apparently stimulating action, as shown by the stage of excitement through which the drinker may pass, is due to its depressing action upon the highest and latest developed part of the brain, namely, that which is associated with the exercise of the intellect and of the will,, The emotions released from proper control are left free play to respond to the immediate environment in which the drinker finds himself, and this as a rule is of a convivial character. The emotional characteristics are the oldest established ; they have their seat in certain lower parts of the brain which are developed early in the animal scale. Next in order of development come the nerve centres associated with the sensory and skilled motor functions, and latest of all is developed that part of the brain connected with the higher intellectual faculties. Thus, the action of alcohol is to depress the functions of the brain from above downwards in the reverse order of their development in the individual and in the race. Among these successive steps the following may be noted :— (i) Blunting of self-criticism.—Self-criticism represents the latest developed of the intellectual functions. When it is blunted, actions are indulged in or remarks made which are not consistent with the usual character of the individual. The resulting effects of this blunting are various to an almost unlimited degree; but certain of them are particularly characteristic of • the action of alcohol, and emerge with considerable regularity in carefully conducted tests and experiments. Among these may be cited:— (a) uncritical self-satisfaction of the individual with his work and actions ; (b) disregard of occurrences and conditions normally requiring caution of act and word ; (c) trespass of rules and conventions previously respected; (d) impaired appreciation of the passage of time; (e) talkativeness; (/) an argumentative frame of mind; quarrelsomeness. (ii) Interference with the performance of skilled movement. This is indicated by clumsiness of behaviour, by the slurring of words. (iii) The blunting of the senses—of hearing, taste, touch, and vision. (iv) The display of the primary emotions. Anger may be displayed at one moment, and affection at another; similarly with boisterousness and depression, laughter, and tears. (v) The failure to respond to external stimulation and the eventual lapse into a heavy sleep. At each successive stage in the process of intoxication, it will thus be seen that the action of alcohol is chiefly narcotic. This narcotic action has been aptly summarised by the Alcohol Committee of the Liquor Control Board in their review of the existing state of scientific knowledge regarding the action of alcohol on the human organism* : — " A further conclusion of capital importance which emerges with equal clearness is that the action of alcohol on the nervous system is essentially sedative, and—with the possible exception of its direct influence on the respiratory centre—is not truly stimulant. The popular belief in the stimulating properties of alcohol, as regards nervous and other functions, 2 Alcohol : Its Action on the Human Organism, H.M. Stationery Office, 1920, Price Is. L6 Notes on Syllabus. seems to be of purely subjective origin and illusory; it is in the main, if not wholly, an effect of the narcotic influence of the drug, for, as we have seen, it dulls the drinker's perception of unpleasant conditions in himself and his surroundings, and may make him feel better, more efficient and stronger than he really is. Effects which are apparently of a different character— effects such as the increased loquacity and freer gesticulation produced by alcohol—which are usually interpreted by the drinker, if not by those about him, as evidences of stimulation, are really narcotic effects; they result from the removal of the control exercised by the higher nervous centres, a control which enables the individual to weigh his words and acts, and renders him self-critical and solicitous as to the impression he is making on other people. The removal of this control and the decrease of critical self- consciousness are, in fact, the most constant and characteristic effects of alcohol, whether in the moderate dose which diminishes restraint and imparts courage to the diffident speaker or in the excessive dose which gives rise to the verbose diffuseness of drunkenness." 6. Effect of Alcohol on the Body's Strength and Power to Work. The drinking of beer, wine, and spirits tends to weaken the muscles of the heart and of the body generally, and so diminishes the power and capacity to work. Experiments were made by Dr. Edmund Parkes, F.R.S., with two gangs of soldiers doing equally hard muscular work (mowing), one gang alternately taking beer during the work and the other not. In every case it was shown that, although men taking beer might for a short time gain on the others, they soon dropped behind, and at the end of the day the total work accomplished by them was less than that done by those who had no alcohol. In the South African war it was observed by Sir Frederick Treves, who was with the column which relieved Lady smith, that soldiers who drank much alcohol were the first to fall out on a long march, and were less fitted to overcome hardships and fatigue than those who either did not drink alcohol, or took it in very moderate amount.* Athletes, when training for racing, boxing, or other sports, usually avoid alcohol because they know the harmful effect it may have upon their strength and endurance. On the Great Northern Railway there was a celebrated gang of navvies who did more work in a day than any other gang on the line, and always left off work an hour or an hour and a-half earlier than any other men. Every navvy in this powerful gang was a teetotaler f Muscular fatigue following severe exertion is far less readily recovered from if alcohol is taken during the work or exertion, and the recuperative powers of those who regularly take too much to drink are greatly lessened. Broadly, therefore, it may be said that experience shows that men engaged in very hard manual labour do their work more easily, in all respects, without alcohol.+ In reporting on the health of men employed in very heavy trades, the Health of Munition Workers Committee stated, in regard to certain steel smelters :—" A few of the workers are abstainers from alcohol in any form. " These latter are usually the most reliable men, When the supply of " drink was restricted by the closing of the public-houses in the district, a " great improvement in the health and the time-keeping of the workmen " was noticed and was admitted by the men."§ In the final report of the Health of Munition Workers Committee, the various factors leading to the production of accidents are discussed, and an example is given of a fuse factory where the number of accidents among * It has never been the custom in the British Army to include alcohol in the ration ; but an issue of rum is made under conditions of stress and exposure to bad weather, on medical recommendation, and with the sanction of the General Officer Commanding. f Work and Wages, Brassey (Longmans, price 5s,), 1894. J For many instances and particulars under this heading, see A Manual oj Practical Hygiene (Churchill), by the late Edmund A. Parkes, M.D., F.R.S. (Section dealing with Alcoholic Beverages). § Industrial Efficiency and I