THE LIBRARY
OF
THE UNIVERSITY
OF CALIFORNIA
PRESENTED BY
PROF. CHARLES A. KOFOID AND
MRS. PRUDENCE W. KOFOID
AN ATLAS OF BACTERIOLOGY
AN
ATLAS OF BACTERIOLOGY
CONTAINING ONE HUNDRED AND ELEVEN
ORIGINAL PHOTOMICROGRAPHS
WITH EXPLANATORY TEXT-
BY
CHAS. SLATER, M.A., M.B., M.R.C.S.ENG,, F.C.S,
Lecturer on Bacteriology, St. George's Hospital Medical School
AND
EDMUND J. SPITTA, L.R.C.P.LoND., M.R.C.S.ENG., F.R.A.S.
Formerly Demonstrator of Anatomy, St. George s Hospital Medical School
LONDON
THE SCIENTIFIC PRESS, LIMITED
28 SOUTHAMPTON STREET, STRAND
1898
Printed by BALLANTYNE, HANSON <5^ Co
At the Ballantyne Press
PREFACE
BACTERIOLOGY is so recent a science that from its
infancy it has been able to record by the aid of
photography the forms and characters of the micro-
organisms discovered, and the pathological changes
produced by them in the tissues. At an early date
Koch insisted on the value of a photographic record
as a convincing proof of the reality and accuracy of
the descriptions. For the most part, proof of this
kind is no longer needed, but more and more has
photography taken the place of the diagram or the
drawing. It is in Bacteriology that illustration by
photography is perhaps more satisfactory than in
any other branch of pathology. Numerous are the
excellent illustrations occurring in works on this
subject, but these plates, even when not deprived of
some of the excellence of the original negatives by
the process of reproduction, are generally scattered
and fragmentary records of particular appearances.
The Atlas der Bakterienkunde by Frankel and
M3517F9
vi PREFACE
Pfeiffer is the only work with which we are
acquainted which systematically illustrates by a
series of photographs the life history of a specific
micro-organism. Excellent as this work is, the cost
prevents it from being one of the ordinary working
books possessed by the student. The present work
has adopted the idea of the " Atlas " in that it pro-
vides a series of photographs of preparations of micro-
organisms and their cultures, such as are usually
met with, and made by, the student in an ordinary
course of practical Bacteriology. It is hoped on the
one hand, that it may be a laboratory handbook
to direct the attention of the student to the points
which he should observe in his own preparations,
at the same time helping the teacher by providing
a series of grouped illustrations ; whilst on the other
it is thought it may find a place in the library
of the medical officer of health and other prac-
titioners, as an atlas to which on certain occasions
he may find it convenient to refer. It is in no
sense a text-book of Bacteriology, and the letterpress
merely serves to link together and emphasise the
teachings of the photographs. The illustrations are
taken from fairly typical cultures and preparations,
and though the appearances vary so much with
varying conditions, it is hoped that those presented
PREFACE vii
may serve to show, when compared with the speci-
mens actually in the hands of the student, the
direction arid extent of the variation.
Descriptions of the methods employed in the
preparation of the specimens have been omitted, as
the student will necessarily possess some recognised
text-book or work on practical bacteriology in which
descriptions of methods are more fully and appro-
priately treated than they could be in such a work
as the present. A, statement of the method used
in the preparation of each specimen forms part,
however, of the short description affixed to the illus-
trations.
On the other hand, a short description of the
photographic methods and apparatus employed
would seem to find a fitting place as an intro-
duction.
The number of illustrations is of necessity limited,
and while trying to associate the importance of the
subject with the completeness of the series, yet in
some instances, such as tuberculosis, it is felt that
the subject, so far at least as the histology of
tubercle is concerned, is so fully treated and illus-
trated in text-books that it is needless to multiply
representations by adding sections of tubercular
organs.
viii PREFACE
All the specimens, with one or two exceptions
which are recorded, have been made in the laboratory
of St. George's Hospital. The reproductions are,
without exception, from original negatives.
To those gentlemen who have kindly allowed their
preparations to be reproduced we wish to express
our thanks. We are especially indebted to Mr.
Harold Spitta for his assistance in the preparation
of the original photographs and in other ways.
For the great care and skill with which the original
photographs are reproduced we have to thank
Mr. A. Dent of Messrs. Dent and Co., Process
Engravers, Clapham.
CHAS. SLATER,
EDMUND. J. SPITTA.
October 1898.
CONTENTS
PAGE
PHOTOGRAPHIC INTRODUCTION ...... 1
BACTERIOLOGICAL INTRODUCTION 10
BACILLUS ANTHRACIS . .24
BACILLUS TUBERCULOSIS ....... 32
BACILLUS SMEGMATIS 40
LEPROSY (BACILLUS LEPR^E) . . . . . .41
BACILLUS MALLEI (GLANDERS) ...... 46
PYOGENIC ORGANISMS . . . . . . . .49
STREPTOCOCCUS PYOGENES 50
STAPHYLOCOCCUS PYOGENES, AUREUS AND ALBUS ... 54
MICROCOCCUS GONORRH(EJE ....... 57
BACILLUS TYPHOSUS 59
BACILLUS COLI ......... 64
DIPLOCOCCUS PNEUMONIA (FRANKEL) . . . . .66
BACILLUS PNEUMONIA (FRIEDLANDER) . . . . .69
BACILLUS DIPHTHERIA . . . . . . .71
SPIRILLUM CHOLERA 77
SPIRILLUM FINKLERI .
SPIRILLUM AVICIDUM (METCHNIKOVIl) .
SPIRILLUM TYROGENUM (DENEKE)
84
x CONTENTS
PAGE
BACILLUS PESTIS BUBONIC^E . . . . , . 87
SPIRILLUM OBEEMEIEEI (RELAPSING FEVER) . .89
BACILLUS TETANI .90
BACILLUS CEDEMATIS MALIGNI .... . . 94
BACILLUS ANTHRACIS SYMPTOM ATICI 98
ACTING-MYCOSIS .99
PLASMODIUM MALARLE . . i . 103
INDEX . 109-
LIST OF ILLUSTRATIONS
Micrococcus Melitensis (Malta fever) . , . -^- 1
Large Micrococcus (Air) ....... 2
Diplococcus in Sputum ..... 3
Streptococcus ......... 4
Micrococcus Tetragenus . . . . . . . 5
Sarcina Flava . ...... 6
Proteus Hominis (Bordone Uffreduzzi) ... 7
Bacillus Anthracis . . . . . .' . . 8
/Spirillum Rubrum ........ 9
Spirillum Rubrum . . . . ... . .;. 10
jB. Typhi Murium . . . . . . ... 11
B. Mycoides ......... 12
B. Figurans . . ... . . . . . 13
B. Leprce (Bordone Uffreduzzi) . . , . . 14
B. Anthracis . . ... . . . . . . 15
B. Anthracis .,.' . . . . . .... 16
B. Anthracis ; . 17
B. Anthracis . . . ..... .. .v .;.... 18
B. Anthracis . . . . . . . . * . 19
B. Anthracis . . .- '.- ',', 20
B. Anthracis . . . . . . . .'*-'. 21
B. Anthracis . 22
B. Anthracis . 23
B. Anthracis . . . . . . . . . 24
xii LIST OF ILLUSTRATIONS
FIG.
Bacillus Tuberculosis in Sputum . 25
B. Tuberculosis in Sputum . . . ' 26
B. Tuberculosis in Sputum ... 27
B. Tuberculosis .28
B. Tuberculosis .29"
B. Tuberculosis in Urine . . . . . . . 30
B. Tuberculosis Hominis . . . < . . 31, 32, 33
B. Tuberculosis 34
B. Smegmatis ......... 35
Bacillus Leprce (B or done Uffreduzzi) . . . . . 36
Bacillus Leprce .37
Bacillus Leprce . . 38
Bacillus Leprce ........ 89"
Bacillus Mallei . 40
Bacillus Mallei ...... .41
Bacillus Mattei ........ 42
Streptococcus Pyogenes 43
Streptococcus Pyogenes 44
Streptococcus Pyogenes ...... 45*
Staphylococcus Pyogenes Aureus 46
Staphylococcus Pyogenes Aureus 47
Staphylococcus Pyogenes Aureus .... 48
Micrococcus Gonorrhcea .... 4^
B. Typhosus ..... 50
B. Typhosus 51
B. Typhosus . < 52
B. Typhosus 53
B. Typhosus .... 54
B. Typhosus . . .... 55
B. Typhosus ... ^ fi
B. Typhosus . --
D I
B. Coli Communis . K0
LIST OF ILLUSTRATIONS xiii
FIG-
B. Coli Communis . . . . . . . . 59 1
B. Coli Communis . . . . . . . . 60
B. Coli Communis . . . . . . ,61
Diplococcus Pneumonice (Frankel) . . . . . 62
Diplococcus Pneumoniw . . . . >- . . 63
Diplococcus Pneumonice (Frankel) ..... 64
B. Pneumonice (Friedldnder) . . . . . . 65
B. Pneumonice . . . . . . . 66
B. Diphtherice . . , ^- 67
B. Diphtherice .... .... 68
B. Diphtherice 69, 70
B. Diphtherice 71
B. Diphtherice 72
B. Diphtherice . . . 73
B. Diphtherice 74
Spirillum Cholera Asiatica (Koch) . . . . . 75
Sp. Cholera Asiatica . . . . . . . 76
Sp. Cholera Asiatica . . . . . . . 77
Sp. Cholera Asiatica . . . . . . 78
Sp. Cholera Asiatica . . . . . . . 79
Sp. Cholera Asiatica . . . . . . . 80
Sp. Cholera Asiatica . . . . . . . 81
Sp. Cholera Asiatica ....... 82
Sp. Finkkri ,, 83
Sp. Finkkri 84
Sp. Finkkri 85
Sp. Avicidum (Metchnikovii) ...... 86
Sp. Avicidum (Metchnikovii) ...... 87
Sp. Avicidum (Metchnikovii) ...... 88
Sp. Avicidum (Metchnikovii) . . . . . . 89
Sp. Tyrogenum (Deneke) ....... 90
Bacillus Pestis Bubonicce ..... 91
xiv LIST OF ILLUSTRATIONS
FIG.
B. Pestis BuboniccK ... 92
Sp. Obermeieri . 93
Bacillus Tetani . . 94
B. Tetani .... . 95
B. CEdematis Maligni . . . 96
B. CEdematis Maligni ... 97
B. CEdematis Maligni ..... 98
B. CEdematis Maligni 99
B. CEdematis Maligni . . . . .100
B. Anthracis Symptomatici . . . . . . . 101
Actinomyces Hominis ....{. ^7 102
Actinomyces Bovis . . . . . . .103
Actinomyces Bovis . . . . . . . 104
Actinomyces Bovis . . . . . \ . .105
Actinomyces Hominis . . . . . . .106
Plasmodium Malarice (Tertian) . . . . .107
Plasmodium Malarice (Tertian) . . . . .108
Plasmodium Malarice (Tertian) . . . . .109
Plasmodium Malarice (Malignant Tertian) . . . 110
Plasmodium Malarice (Malignant Tertian) . . . Ill
Figures 5 and 75 are from preparations kindly lent by Dr. W. H. Dickinson.
Figures 7 and 36 are from preparations kindly lent by Prof. Bordone
Uffreduzzi.
Figures 91 and 93 are from preparations kindly lent by Mr. E. L. Hunt.
Figure 100 is a preparation by Mr. Deller.
Figure 111 is from a preparation kindly lent by Dr. Manson.
PHOTOGRAPHIC INTRODUCTION
As there are manuals dealing with photomicro-
graphy in its various branches already in exist-
ence, a complete description of the methods and
apparatus employed seems unnecessary, and it only
remains to state which of the usual methods were
selected, and what deviations from these methods
were made to meet the requirements of particular
cases.
A horizontal camera was employed throughout
except in the few instances where the nature of the
specimen compelled the use of a vertical apparatus.
The microscope stand invariably used was a Zeiss
No. IA. The arrangement for clearing the stage
which this stand possesses was found very con
venient when culture plates and similar objects were
to be photographed.
Apochromatic objectives were always used : their
superior detinition and their inherent property of
photographing equally well in all colours of the
% PHOTOGRAPHIC INTRODUCTION
spectrum make them especially suitable. Most
of the photographs of high magnification were
taken with a Powell and Lealand apochromatic
T V N.A. 1'43, specially made for the photography
of bacteria. It possesses a very flat field without
loss of central definition, but has an inconveniently
short working distance. All the other apochromatics
were made by Zeiss viz., -J- N.A. 1*4, -J-, ^, 1 inch, a
35 mm. lens, and a Planar of 50 mm. focus.
Projection eyepieces were mostly employed, with
the necessary camera extension to obtain the re-
quired amplification, but at times the ordinary
compensating oculars for higher magnification were
used in their stead. It is not a little curious that
occasionally certain specimens were better rendered
by the T \- and a high eyepiece with short camera
extension than with the projecting ocular and
greater camera length.
With respect to Substage Condensers, a dry
apochromatic (N.A. '95) by Powell and Lealand was
always used for powers over ^, and an achromatic
by Zeiss or one by Conrady for all the others,
excepting for the 35 mm and Planar lenses, which
performed best when a Nelson's quasi-achromatic
doublet was employed.
A limelight mixed jet by Beard was the illumi-
PHOTOGRAPHIC INTRODUCTION 3
nant, and after several years' experience we have no
hesitation in expressing great satisfaction with its
performance.
Owing to the special colours of the stains em-
ployed in bacteriological specimens the use of
"colour screens" is absolutely necessary, in order
that sufficient contrast between the organism and
the background may be obtained, and the resulting
photograph be sharp, clean, and crisp. It is in the
selection of this "colour screen" that the individu-
ality of the photographer becomes apparent, but
even after much experience it is not always possible
to choose, without trial, the screen which will give
the best result. In the selection of these light
filters much stress has been laid by some authorities
on the advisability of using such screens as give
a pure monochromatic light. In the photography of
bacteria this appears to be both practically and
theoretically wrong. Where the object is to get the
best possible photographic resolution of such objects
as diatoms, with their so-called secondary markings,
whose lines may be resolved into dots many
thousands to the inch, then both theory and prac-
tice demand that light of the shortest wave length
possible be employed. But where contrast alone is
^wanted, as in the photography of bacteria which have
4 PHOTOGRAPHIC INTRODUCTION
no ultimate structure comparable to the fine details
of the diatom, it is a disadvantage to employ more
colour than is absolutely necessary to secure the
requisite contrast, as this merely increases the
exposure without adding to the perfection of the
final result. Screens of all colours were employed to
secure contrast only; the one most commonly used
was a screen of " pot-green " glass of medium density
and -|- inch thick. This appeared to be the most
suitable for the majority of stains which we met
with in the specimens.
Focussing in photomicrography is always a diffi-
culty. Sometimes an ordinary ground glass was
used, and at others an exceedingly fine variety
made especially for us by Ross & Co. A Dallmeyer
hand magnifier was used with this.
The disadvantage of using the finest ground glass
is that the general lighting of the field is entirely
lost, while, with the rougher variety, though the
general field of view is well seen, the coarse grinding
prevents accurate focussing without some diffi-
culty, especially when the hand magnifier is used.
The focussing screen in the present instance was
so constructed that the glasses could be readily
changed as thought best.
An even illumination of the field is important if
PHOTOGRAPHIC INTRODUCTION 5
an unequal background in the print is to be avoided.
The lime must |be carefully moved from side to side
and up and down to secure this result. A con-
venient stand for the jet, which is capable of being
racked in both these directions with ease and
uniformity, was made at our direction by Mason
of Clapham.
The condenser was always centred for each
objective, and critical light was used throughout.
If dark spots appeared on the picture the lime
was turned on its axis, or the condenser just touched
so as to remove the marks without affecting the
definition.
Occasionally we have employed a second con-
denser between the light and the substage con-
denser. It serves to broaden out the illuminant,
and is very useful to equalise the light over the
field. Nelson's quasi-achromatic condenser we have
found very useful for the purpose, fitted on a stand
similar to that employed for adjusting the limelight
previously described.
The aperture of the iris must not be contracted
at all when photographing bacilli with high N.A.,
for, if so, white defraction marks will appear round
each bacillus, and will spoil the final result. Only
when using low magnification for tissues must it be
6 PHOTOGRAPHIC INTRODUCTION
closed for the purpose of preventing " flooding " of
light ; and even then, not usually more than one-
third of the diameter of the back lens of the objec-
tive when looking down the tube of the microscope
after removing the eyepiece. We have found that
an additional iris diaphragm placed above the objec-
tive, known to some microscopists as a " Davis
diaphragm," is of great service with quite low
powers it reduces the N.A. of the objective a trifle,
it is true, but it frequently gives greater depth of
focus and sharpens up the whole picture.
The negatives were all taken without exception
on Edwards's Isochromatic medium ^-plates and
developed with hydrokinone and soda. Although
the isochromatism of the emulsion is not all that
could be desired, yet its uniformity and fine grain
have always been so pronounced that we have never
felt inclined to use plates by other makers, although
we have tried most of them.
Exposure is always a difficult matter ; but as a
rough guide we may state that, using the pot-green
glass to which we have previously referred, the
isomedium plate, magnification at 1000 diameters,
and a strong limelight mixed jet, the exposure
varied from f to 1^ minutes, or less if the auxiliary
lens was used. It is not easy without practice at all
PHOTOGRAPHIC INTRODUCTION 7
times to be positive whether the negative has been
over or under-exposed, as the appearances pre-
sented do not conform as much as would be
expected with those presented by over and under
exposure in negatives of other subjects. Speaking
again quite generally, the best guide we have
found is to examine the background of the de-
veloped plate about whose exposure there is doubt,
taking no notice of the appearance of the bacilli.
If the background of the negative is of the
right density for producing a grey ground in the
print a matter which experience will soon teach-
then, if the proper contrast glass has been used, the
bacteria should appear well arid clearly defined and
the print should be " plucky " and sharp, presuming,
of course, the focussing has been correct. But if the
background be faint in the negative the final pic-
ture will never be a good one, but usually flat and
feeble in contrast. Here it is necessary to point out
that the judgment of the photographer is not unfre-
quently put to the test as to the amount of contrast
really required to make the bacilli stand out in the
print. In some cases an almost white background is
best, whilst at others a grey one is to be preferred.
We have in cases been obliged to try the direct
experiment, and choose that which appeared to
8 PHOTOGRAPHIC INTRODUCTION
give the better result. A faint background in the
negative nearly always means under-exposure or
extreme under-development, and no amount of sub-
sequent intensification will cure it. Over-exposure
appears as an intense blackening of the background
as well as of the bacilli ; the same effect is often
produced by extreme over-development with a
rightly- exposed plate.
It occasionally happens that a capital specimen in
a bacteriological sense is not sufficiently stained for
any coloured glass to produce the necessary contrast
to make therewith a good photograph. Advantage
then must be taken of the fact that the bacteria rarely
possess any details of structure, so that the picture
must be under-exposed for the bacteria, and then very
freely developed with a strong and well-restrained
developer. No amount of development will then
bring out details of the bacteria, even if there were
any, because of the under-exposure, but the pro-
longed development may serve to increase the con-
trast. In many cases this will produce results far
above expectation.
The negatives were always developed with
Thomas's hydrokinone and soda, until the back of
the negative looked very decidedly grey ; 1 gr. of
bromide to the ounce of developer was added once
PHOTOGRAPHIC INTRODUCTION 9
or twice during the process. This seems to keep
the bacilli clear and free from deposit. Should
development have been carried too far, the negative
may be cleared if it is worth keeping ; so, too, if the
light be not quite even, the thickened part may be
thinned by using the same clearing solution with a
brush. The cyanide and iodine reducer was usually
employed for this purpose.
The tubes were all photographed with a 5 -inch
Ross-Goertz anastigmatic lens, the reflections off the
sides of the glass being avoided by immersing the
tube in a water bath. Limelight was thrown on
the tube either from the front or back, occasionally
employing a ground glass between the illuminant and
the water bath.
For all purposes " backed " plates were used.
BACTERIOLOGICAL INTRODUCTION
THE theory that infectious diseases were due to
the presence of living organisms and that the
characters of such diseases could be referred to the
nature of the "contagium vivum" is of considerable
antiquity. It is only of recent years, however, that
proof of this position has been obtained, and that a
large number of infections in man and the lower
animals have been traced to the action of parasitic
micro-organisms which have gained access to the
tissues. These micro-organisms are for the most
part unicellular plants belonging to the lowest
division of the vegetable kingdom. They are
grouped under the name of Schizomycetes, or " fission
fungi," as a sub-division of the Fungi ; or, perhaps
better, as Schizophytes (F. Cohn), and regarded as
closely related to the Algse.
Organisms belonging to other allied groups e.g.,
the Hyphomycetes and Blastomycetes are known to
produce diseases of animals and plants, but nearly
BACTERIOLOGICAL INTRODUCTION II
all the organisms represented in the following photo-
graphs are included amongst the Schizophytea
The cells in this group are chiefly remarkable in
that it has been impossible to demonstrate, with
certainty, a differentiation between the protoplasm
and the nucleus.
The Schizophytes fall roughly into three morpho-
logical groups :
I. Cocci, comprising all those organisms whose
cells are spherical.
II. Bacilli, comprising the rod-shaped or cylin-
drical-celled organisms.
III. Spirilla, comprising the spiral or corkscrew
cells.
This grouping cannot be regarded as strictly scientific,
but it is convenient. Owing to the undoubted poly-
morphism of these organisms a further convention is
required to make it a practical classification. The
bacilli are not unfrequently found in acoccoid form,
or in such extremely short cylinders that it is im-
possible to distinguish them from cocci. If, how-
ever, the apparent cocci are known to assume the
bacillary form under any conditions, then the organ-
ism is ranked under the group which may be
regarded as representing its highest form, assuming
12 BACTERIOLOGICAL INTRODUCTION
the passage from cocci to spirilla as an ascent in the
scale of plant life.
The method of multiplication common to the entire
group of Schizophytes is that by fission, or cell
division. By outgrowths from the cell walls
advancing in two directions until they meet, the
original cell is divided into two exactly similar
daughter cells. The number of planes of division,
the parallelism of these planes, and the associa-
tion of the daughter cells resulting from the process
of division give rise to various sub-groups of the
three primary morphological divisions.
Cocci. These are spherical cells showing no
differentiation. The cells of different organisms of
this group show very considerable variation in
size, as may be seen in Figs. 1 and 2, the difference
in the cells ranging from '3 p to 2-3 ^ in diameter.
In the same micro-organism considerable difference in
the size of the individual cells may be observed.
The principal sub-groups of the Coccacese are
(a) Staphylococci. This name is given to cocci
forming bunches or irregular groups of cells produced
by the successive division of the spherical organisms ;
the planes of division are probably uniaxial, but the
successive planes not parallel to one another.
Cover-glass preparations of organisms of this
O t 9^r;)k;. TfcgA f noitr/mq;yi4
.otooi X .d ir.Iooo noiio^jotS .tBmoiriooqr,
FIG. i. MICROCOCCUS MELITENSIS (MALTA FEVER).
Cover Glass Preparation, Agar Culture. Carbol-Fuchsine,
7 apochromat, Projection ocular 6. x 1000.
FIG. 2. LARGE MICROCOCCUS (Am).
Cover Glass Preparation, Agar Culture, Carbol-Fuchsine,
apochromat, Projection ocular 6. x icoo.
K&
FIG. 2.
FIG. 3.
FIG. 4.
FIG. 3. DIPLOCOCCUS IN SPUTUM.
Cover Glass Preparation, Gentian-Violet, T V apochromat,
Projection ocular 6. x 1000.
FIG. 4. STREPTOCOCCUS.
Cover Glass Preparation, Agar Culture, Carbol-Fnchsine,
apochromat, Projection ocular 6. X icoo.
i '-i
*3*.iD
.d
BACTERIOLOGICAL INTRODUCTION IS
group are represented in Figs. 1 and 2. The cells are
small, circular, and fairly regular in size in each
specimen. The method of preparation prevents any
conclusion as to the genetic relations of the groups,
In Fig. 46, which represents the Staphylococcus
Pyogenes Aureus in pus, the natural grouping of the
organisms is better seen.
(b) Diplococci. These are formed by the uniaxial
division of the spherical cell and the coherence of
the two resulting cells. On the further division of
these cells the cohesion between the original pair
apparently breaks down, so that successive pairs
are formed. Fig. 3 shows diplococci occurring in
sputum. The individual cells in this instance are
somewhat elongated, and with a lens various stages
of division may be observed, some of the longer cells-
being in a state of incipient sub-division. This
lengthening of the cells which precedes division gives
a bacillary form to the organisms. In some cases
e.g., the gonococcus, Fig. 49, the division is not
accompanied by elongation, so that the resulting
diplococcus presents two flat opposed faces.
(c) Streptococci (Fig. 4). These are organisms
occurring in chains of varying length formed by
successive uniaxial division of the spherical cell, the
successive planes being parallel to one another, and
14 BACTERIOLOGICAL INTRODUCTION
the resulting cells remaining coherent. Obviously
this group differs from the diplococci only in the co-
herence of the successive pairs of cells, and, indeed,
it is not rare to find short chains of four or six
members among the diplococci and pairs of cells
among the streptococci. The not unfrequent dumb-
bell-like arrangement in pairs of the cells comprising
a streptococcus betrays this method of growth, and
can be seen in several of the shorter chains in the
photograph. The variation in size of the individual
cells appears also.
The above are the chief sub-groups formed by
uniaxial division of the spherical cell, but by a biaxial
division in planes at right angles to one another the
original cell gives rise to a group of four, and these
tetrads are grouped under the name.
(d) Merismopedia. The several varieties of the
organism Tetragenus belong to this group, and that
form which is frequently met with in cavities in
phthisis is shown in Fig. 5. Micrococcus tetragenus
is apparently harmless in man, but is pathogenic in
the mouse, and from the peritoneal fluid of such an
inoculated mouse the preparation is made. This
slide shows, in addition, the fact that a micro-
organism may be surrounded by a distinct capsule.
The capsule is a very inconstant feature, being
jcn'I ,)jiciioid:>oq
t 3ioiIo
t )raoidooq
p IG> 5 ._MicROCOccus TETRAGENUS.
Cover Glass Preparation, Splenic Fluid, Carbol-Fuchsine,
^ apochromat, Projection ocular 6. x 1000.
FIG. 6. SARCINA FLAVA.
Cover Glass Preparation, Gelatine Culture, Gentian-Violet,
apochromat, Projection ocular 6. x 1000.
FIG. 5.
FIG. 6.
BACTERIOLOGICAL INTRODUCTION 15
generally greatly dependent on the conditions under
which the organism is living. It generally dis-
appears in artificial cultures, and is best seen in the
secretions or tissues of the infected animal. These
remarks apply to most capsulated organisms.
It will be noticed that the capsule surrounds the
group. Cocci collected into irregular groups sur-
rounded by capsules are sometimes called asco-cocci.
Beside the tetrad groups there appear in the pre-
paration groups of two organisms. These probably
represent the tetrad viewed from the side, or, in
some cases possibly a group in which the division in
the two axes has not been synchronous.
(e) Sarcina. To this group belong those organisms
which form groups of eight cells by a triaxial division
of the original cell by planes at right angles to one
another. The unit of division in this sub-group is a
packet of eight. Such an organism is shown in
Fig. 6. At first sight this would appear to belong
to the preceding group, but this appearance is due to
the impossibility of photographing organisms on two
planes, and the consequent necessity for choosing a
place in the specimen where the groups have been
dissociated. The thickly-stained group on the left,
and still better, the group on the extreme right of
the specimen indicates the true character of the
16 BACTERIOLOGICAL INTRODUCTION
arrangement. The well-known sarcina ventriculi
belongs to this group.
Bacilli. The cylindrical organisms of this group
differ from the Cocci in that division takes place in
one direction only at right angles to the long axis
of the cell so that no forms corresponding to
Sarcina or Merismopedia occur. The bacilli vary
very greatly in size, B. Anthracis, one of the largest
of the pathogenic microbes, being from 3-5 /u long
by 1 p wide, while the microbe of influenza has
dimensions approximately only the tenth of these.
The breadth of the cell is a much more constant
feature than the length, as the growth of the cell is
in the direction of the long axis. As a rule the
cylinder is of equal diameter throughout. Some
possess much more rounded ends than others. By
division and coherence groups of bacilli are formed
which correspond to the diplococci and streptococci
of the Coccacese, but these groupings are amongst
the bacilli of less constancy, and the names which
distinguish them are regarded more as describing
varieties of a bacillus than as being the names of
sub-groups. The term diplobacillus is not often
employed, but might well be used for the organisms,
which are by no means uncommon and were formerly
described as figure of 8 bacilli (Pasteur). The chains
FIG. 7.
FIG. 8.
FIG. 7. PROTEUS HOMINIS (BORDONE UFFREDUZZJ).
Cover Glass Preparation of Culture, apochromatic, Pro-
jection ocular 6. x 500.
FIG. 8. BACILLUS ANTHRACIS.
Edge of Impression Preparation of Colony on Gelatine,
Loffler, T lr apochromat, Projection ocular 6. x 1000.
,oo x .d
.i;jA.viHT!" W& :.*-
FIG. 12.
BACTERIOLOGICAL INTRODUCTION 21
as the resistant cells which occur in nearly every
culture.
The formation of the Endospores is much better
known, and occurs in certain of the bacilli and
spirilla. Bacilli with endospores are shown in Fig.
11 and in several other photographs (17, 94, and 97)
illustrating special organisms. The spore appears
as a refracting granule within the cell in the position
subsequently occupied by the developed spore, or as
a number of scattered granules which coalesce to
form the spore. In any case, as development pro-
ceeds, the granule grows and becomes an oval or
spherical thick-walled, highly refractile body, while
at the same time, as a rule, the protoplasm of the
cell grows more and more translucent, and appears
to be absorbed in the formation of the spore. The
spores may, in relation to the mother cells, be
central or polar. In Fig. 12 and in Fig. 17 they are
centra] and do not deform the cell, the short axis of
the spore being less than the diameter of the cell.
In Fig. 97 they are central, and in Fig. 94 they
are polar, but in both cases cause by their size a
modification in the mother cell, causing it in the
first case to become fusiform, and in the second to
assume a drumstick character. These modified
spore-bearing cells are known as clostridia. One
22 BACTERIOLOGICAL INTRODUCTION
spore only is formed within a single cell, but each
cell does not necessarily form a spore.
The spore stains with difficulty and retains the
stain, when once tinged, with considerable tenacity,
so that it is possible to stain the spores and the
body of the cells with contrasting stains. Fig. 12
is prepared in this way, the spores being red and
the cells blue. Owing to the contrast between the
strongly stained spores and the pale cell body,
the latter appears narrower than the spore, but
this is not really the case, as a comparison with
unstained specimens at once shows.
The differences in the morphological characters
of the various Schizophytes are frequently slight
and variable, and in order to distinguish between
them, advantage is taken of variations in the mode
of growth on various media. Some liquefy gelatine,
some do not ; some form radiating colonies, others
regular and circular colonies ; some are granular,
others structureless ; some pigmented, others colour-
less. Many illustrations of the so-called charac-
teristic growths of organisms on various media are
given throughout the book. To permanently record
the characters of the surface colonies of micro-
organisms, preparations known as " impression
preparations" are made. Such a one is shown in
FIG. 13.
.w
v m
&
FIG. 14.
FIG. 13. B. FIGURANS.
Impression Preparation, Gelatine Culture, Fuchsine, 24 mm.
apochromat, ocular 5. x 60.
FIG. 14. B. LEPR^ (BORDONE UFFREDUZZI).
Cover Glass Preparation, Agar Culture, Carbol- Fuchsine,
apochromat, Projection ocular 6. x 1000.
>d X .g IBilJOO . tlitnOlff'XJCJJ
i.iJ .H 41 ofi
Iodifi3 .ointifi J lugA, ,noitr.iH
,oc:'i x d TPISKJO Kocl-jd'ioi'i i*'- 1 '- li i j > r
BACTERIOLOGICAL INTRODUCTION 23
Fig. 13. They are made by pressing a cover glass
on the surface of the growth and subsequently
staining the adherent organisms. Under a low
power (Fig. 13) the general character of the growth
is well seen, while a similar preparation seen under
a higher magnification (Fig. 8) shows the relation of
the individual cells and of the filaments to one
another, and displays the mode of growth which
results in the production of the peculiar convoluted
colonies with fibrillar offshoots which characterise
the organism represented.
The mode of multiplication by fission which
characterises the Schizophytes occasionally appears
to be supplemented by budding or branching. Such
budded or branched forms are shown in Fig. 14,
which represents a sub-culture on agar of the
B. Leprae isolated by Bordone Uffreduzzi. Similar
forms are seen in other bacilli and especially in
B. Tuberculosis. How far these may represent
forms of reproduction and how far they are merely
forms of degeneration is still uncertain. They are
certainly found most commonly in old cultures not
remarkable for their vitality or virulence. The
budding and branching have also been thought
to betray a genetic relationship with the yeasts and
hyphomycetes.
BACILLUS ANTHRACIS
IN 1850 Davaine and Rayer observed that anon-
motile bacillus was constantly to be found in the
blood of animals which died of anthrax, and this
observation was extended by Brauell in 1857 to the
disease as it occurred in man. From 1863 onwards
Davaine sought to prove that this bacillus was the
cause of the disease, but it was Koch who, in 1876,
furnished this proof, and it is to him that we owe
our knowledge of the complete life cycle, including
the spore- bearing stage, of the specific micro-
organism. The study of the physiology of the
bacillus, especially with regard to the possibility of
obtaining cultures of attenuated virulence, and the
use of such cultures as preventive vaccines, is in
great part the work of Pasteur and his pupils. The
appearance of the bacillus as it is met with in the
blood of an animal dead of anthrax is shown in
Fig. 15. It is a non- motile, rod-shaped organism,
3-5 fj. in length and 1-1*5 /n in width, occurring
tAXH"f}*A
; - !! -
FIG. 15. B. ANTHRACIS.
Cover Glass Preparation, Splenic Blood (Cow), Carbol-
Fuchsine, T \ apochromat, Projection ocular 6. x 1000.
FIG. 16. B. ANTHRACIS.
Cover Glass Preparation, Splenic Blood of Mouse, Gram,
T V apochromat, Projection ocular 6. x 1000.
FIG. 15.
FIG. 16.
BACILLUS ANTHRACIS 25
in short chains of two to six members. The indi-
vidual cells are square-ended, and stain strongly
with any of the basic aniline dyes, and also by
Gram's method. In stained specimens, owing to
the original rectangular shape of the bacillus and
the shrinkage due to the methods of preparation,
the organism not unfrequently appears somewhat
concave at the ends and sides, so that the chain of
cells looks like a piece of jointed bamboo. The
photograph shows some of the cells strongly and
evenly stained, while others, owing to a degenera-
tion or loss of their protoplasm, are irregularly or
not at all stained, the position of the bacillus being
indicated only by the faint outline of the cell enve-
lope. This sheath, surrounding the protoplasmic
contents of the cell, is occasionally very plainly
seen, as in the preparation represented in Fig. 16.
Though not always capable of being demonstrated,
the sheath is a constant feature of the bacillus, and
a development of the envelope has been regarded
by Metchnikoff and Sawtchenko as, probably, a
means by which the bacillus protects itself against
bactericidal substances. In the blood, unless it has
been shed for some time and kept under condi-
tions favourable for the saprophytic growth of
the bacillus, as occasionally happens in organs
26 BACILLUS ANTHRACIS
sent for examination, no trace of spore formation
can be seen. The chains of bacilli also are short,
unless the blood examined is that of a resistant
animal inoculated with a virulent culture, or that of
a susceptible animal inoculated with an attenuated
organism ; under these circumstances longer chains
of bacilli mav be found.
t/
If a hanging drop bouillon culture be made from
the blood, and kept at 37 C., the individual cells
may be seen to divide and the resulting cells grow
until they resemble the original mother cells. As
the result of this division and growth the original
single cells or short chains develop into enormously
long, intertwisted, looped filaments, such as are
seen in Fig. 8. When unhampered in growth, the
chains of bacilli tend to arrange themselves with
remarkable parallelism.
As the growth ages the division between the cells
becomes more marked and the cells more cubical.
At the same time, in the centres of many of the
cells highly refractile points appear, gradually in-
crease in size, and form an oval, highly refringent,
thick-walled body the spore which lies with its
long axis in the direction of the length of the cell
and does not cause any alteration in the cell form.
The protoplasm of the vegetative cell during this
BACILLUS ANTHRACIS 27
process becomes more and more hyaline until the
spore comes to be free in the original cell envelope,
and finally, by the disappearance of this envelope, is
set entirely free. The preparation (Fig. 17) which
is made from such a culture as that described shows
the process of spore formation, which is unequally
advanced in the various filaments. The spores are
unstained and appear as clear oval spaces in the
stained bacilli and are most advanced and best seen
in the shorter filaments to the left of the photo-
graph.
Spore formation requires the presence of free
oxygen, and occurs at temperatures between 15 C.
and 42 C. ; it is most free at about 20 C. to 25 C.
The growth of the vegetative cell takes place at
temperatures ranging between 12 C. and 45 C. ; the
optimum temperature is about 37 C. The vegeta-
tive cell is killed at 60 C., and the spore at 120 C.,
though the mode of applying the heat and the
length of time of exposure modify the result.
To the growth and formation of long intertwisted
filaments and chains of bacilli, as described above, are
due the characteristic microscopic appearances of
anthrax cultures. In bouillon the growth forms
cotton-wool-like masses, which remain coherent
-even when the culture is shaken. As the growth
28 BACILLUS ANTHRACIS
becomes older and spore formation advances, the
cohesion between the cells grows less, and finally
disappears when the spores are mature and free, so
that shaking then produces a general turbidity of
the fluid containing the growth.
The dull grey blanket-like growth of the young
agar culture similarly betrays the microscopic
structure.
In gelatine stab-culture (Fig. 18) the growth is
very characteristic, and produces with its radiating
filaments starting from the line of inoculation,
longest near the surface, and gradually diminishing
as the depth in the gelatine increases, an appear-
ance which has been compared to that of an
inverted fir-tree. Liquefaction slowly takes place,
commencing at the surface ; and in the liquefied
portion the growth acquires the usual cotton-wool
appearance characteristic of young cultures in fluid
media.
In gelatine plate cultures the appearance of the
colonies differs as the growth occurs on the sur-
face or in the depth of the medium. An impression
preparation of a surface colony (Fig. 19) shows it
to consist of a series of beautifully regular parallel
lines of bacilli concentrically arranged, and resulting
in a roughly circular growth with a waved margin.
I
FIG. 17. B. ANTHRACIS.
Cover Glass Preparation, Bouillon Culture, Spore Forma-
tion, Carbol-Fuchsine, T \> apochromat, Projection ocular 6.
X 1000.
FIG. 18. B. ANTHRACIS.
Gelatin Stab Culture, i : i.
KIG. 18.
BACILLUS ANTHRACIS 29
The intimate structure of the colony, and espe-
cially of the free margin, is shown in Fig. 8, which
represents a highly magnified view of the edge of
such an impression preparation.
In the colony represented the border is quite
unbroken, but not rarely individual lines of bacilli
break from the edge and pass over the surface of
the medium, and occasionally the colony is sur-
rounded by shaggy-hair-like processes (Medusa-
head colonies). In the depths of the medium the
colonies are more spherical, granular, and brown.
Slow liquefaction takes place.
Animals can be infected with anthrax either by
inoculation or by the inhalation or ingestion of the
bacilli. Though there are certain local differences
due to the point of entrance of the bacillus, and
though the symptomatology may differ, yet the
microscopic appearances presented by the blood
and by sections of the internal organs are in all
cases those characteristic of an acute septicaemia.
Beyond a general congestion there is very little
structural change in the tissues, and the microscopic
appearance presented is that of a general injection
of the blood-vessels, especially of the smaller arteries
and capillaries, with bacilli. Anthrax bacilli in-
crease with enormous rapidity in the body of a
30 BACILLUS ANTHRACIS
susceptible animal, and are distributed in a passive
manner, being themselves immobile, by the blood
stream. The appearances presented in sections are
conditioned by these circumstances. In man sub-
cutaneous inoculation gives rise to a distinct local
lesion, the " Malignant Pustule." This appears as a
small vesicle seated on an indurated base. The
centre rapidly becomes black and gangrenous, and
the eschar is surrounded by other vesicles which
unite with one another and with the primary lesion.
There is great swelling and oedema of the tissues.
A section through such a malignant pustule is
shown in Fig. 20. The centre of the eschar is im-
mediately to the right of that portion of the pustule
which is shown. It will be seen that the papillae
are distended and disintegrated by the oedema,
while they are at the same time crowded with
bacilli, which also extend for some distance into the
subcutaneous tissue. In the papillae, as is best seen
in the one at the right of the section, the bacilli are
arranged in the direction of the blood-vessels.
In the lung, as represented in Fig. 21, the
alveolar wall is but little modified, and the alveoli
are free from inflammatory deposits, but the capil-
laries are filled by bacilli, and the alveoli are mapped
out by this bacillary injection.
oniJKbO uo ^rioloj .noi)ciq'ji f l
-os; x Jfihioiriooqfi .nini ^^ .is^ t h>lot'/
M to
FIG. 19. B. ANTHRACIS.
Impression Preparation, Colony on Gelatine, Gentian-
Violet, Zeiss, 35 mm. apochromat. x 20.
FIG. 20. B. ANTHRACIS.
Section of Malignant Pustule, Gram and Eosin, 24 mm,
apochromat, Compensating ocular 12. x 125.
FIG, 19.
FIG. 20.
iioj)'j-
,aaiffii>ioOTaN bcus aiKiO { u^aiqei io
Y x -
*. -r - ^
:
FIG. 21. B. ANTHRACIS.
Section of Lung (Mouse), Gram and Eosin, apochromat.
Projection ocufar 6. x 400.
FIG. 22. B. ANTHRACIS.
Section of Spleen, Gram and Picrocarmine, jj- apochromat,
Projection ocular 6. x 370.
FIG. 21.
\
FIG. 22.
f
FIG. 23.
I <
i
FIG. 24.
FIG. 23. B. ANTHKACIS.
Section of Kidney (Glomerulus), Gramand Picrocarmine,
apochromat, Projection ocular 6. x 375.
FIG. 24. B. ANTHRACIS.
Section of Liver, Gram and Eosin, 1 apochromat, Projection
ocular 6. x 500.
BACILLUS ANTHRACIS 31
In the spleen, which is always greatly enlarged
in this disease, the bacilli are found in very great
numbers (Fig. 22).
In the kidney the distribution of the bacillus is
very characteristic, and is especially marked in the
glomeruli and in their afferent vessels. These latter
are often blocked with masses of bacilli, and the
section (Fig. 23) shows the appearance of the
glomerulus with its vessels filled with the micro-
organisms.
Similarly the section of the liver shows prac-
tically no histological change, but the bacilli are
seen passing in lines between the columns of liver
cells (Fig. 24).
BACILLUS TUBERCULOSIS
THAT tuberculosis was an inoculable and infectious
disease was fully established by Villemin in 1868.
This conclusion was confirmed and the paths of in-
fection experimentally shown by the feeding experi-
ments of Chaveau and Parrot (1868-1873), the
inoculations of the anterior chamber of the eye, with
the production of Tubercle of the Iris, by Cohnheim
and Salomonsen (1877), and the inhalation experi-
ments of Tappeiner (1878-1880). Numerous other
workers also added to the evidence. The specific
infectious agent existing in tubercular material
was, however, not discovered until 1881-1882, when
Koch demonstrated the constant occurrence of a
minute, immobile, slender bacillus in the sputum of
phthisical patients and in all forms of tubercular
material.
The bacillus thus demonstrated was successfully
cultivated. A repetition, with the pure culture,
of the inoculation, ingestion, and inhalation experi-
:
"
-
FIG.
*
i w,
V
FIG. 26.
PIG. 25. BACILLUS TUBERCULOSIS IN SPUTUM.
Cover Glass Preparation, Carbol-Fuchsine, Ehrlich method,
f.ounterstained with Methylene Blue, A apochromat, Projection
ocular 6. x 500.
FIG. 26. B. TUBERCULOSIS IN SPUTUM.
Stained as Fig. 25, T V apochromat, Projection ocular 6.
x TOGO.
'.aoihnrcpi'iai
f , tafiioidpoqji J ,st iffl snefvd Jo M < Itrw baaifilsn^Jnr c
,o .!oifj'3i .^ 'toojoiM Jiunoidooqi. ,. r t -
.H .8s .oi'^I
inoil
FIG. 27. B. TUBERCULOSIS IN SPUTUM.
Cover Glass Preparation (Intracellular), stained as Fig. 25,
apochromat, Projection ocular 6. x 1000.
FIG. 28. B. TUBERCULOSIS.
Pus from Tubercular Cavity, stained as Fig. 25, ^ apochro-
inat, Projection ocular 6. x 1000
FIG. 27.
FIG. 28.
V
FIG. 29.
l \
.
FIG. 30.
j|
i
FIG. 29. B. TUBERCULOSIS.
Cover Glass Preparation, Culture on Glycerine-Glucose-
Agar, Carbol-Fuchsine, decolourised by Sulphuric Acid 20
-per cent., r \j apochromat, Projection ocular 6. x 1000.
FIG. 30. B. TUBERCULOSIS IN URINE.
Cover Glass Preparation, stained as Fig. 25, T V apochromat,
Projection ocular .6- x jooo.
'
yd .niafbu
,00'Ji x .> iflr/30 nohasipiH t tRfnoidDoq>:
BACILLUS TUBERCULOSIS 35
to form small groups of such regularly arranged
bacilli.
In the sputum, as, indeed, in tubercular tissues, the
bacillus may be entirely extra-cellular, or may occur
singly, or in groups within the polynuclear pus cells.
In Fig. 25 the great majority of the organisms lie
without the cells whose nuclei are scattered over the
field.
In Fig. 27, on the contrary, the bacilli are formed
almost exclusively within the cells, many of which
contain large groups of the micro-organism, and in
some of these groups the parallel arrangement of
the bacilli occurs.
It will be observed that in the specimens 25-28,
two of which are preparations from sputum and
one from the material found in a small tubercular
cavity, there are practically no extraneous organisms.
This, of course, is not always the case, and secondary
infections play an important part in the processes of
excavation ; but, speaking broadly, those portions of
fresh sputum which contain many tubercle bacilli do
not contain very many other microbes, though in
neighbouring portions many varieties of organisms
may be found.
When found in the urine (Fig. 30) from cases
of tuberculosis of the urinary tract, the bacillus
36 BACILLUS TUBERCULOSIS
rarely presents the typical beading or bending, but
usually stains in a homogeneous manner, and is found
lying in clumps, occasionally of considerable size,
and usually, as might be anticipated, associated
with the pus cells contained in the urine. In all
urine, but especially in the urine of women, the
bacillus may be confused with the Smegma Bacillus
(Fig. 35), which has a similar staining reaction, but is
said to lose its stain when treated with alcohol sooner
than the bacillus tuberculosis similarly treated.
From tubercles and tubercular materials, the
specific bacillus was isolated and cultivated by
Koch. Using gelatinised sterile blood serum as the
cultivating medium, and spreading upon this surface
the well-crushed material from an uncontaminated
tubercle, faint traces of growth may be observed
spreading from the inoculated material after about
fourteen days' incubation at 37 C. The growth
subsequently increases slowly, and forms small dry,
scaly, raised, limpet-like crusts. The primary cul-
tures are difficult to obtain, and not copious ; but the
sub-cultures are less exigent and can be grown with
greater facility on other media, especially the agar
medium containing glycerine 6 per cent, and sugar
2 per cent., which was originally suggested by Nocard
and Koux. On this medium, unsuitable -though
BACILLUS TUBERCULOSIS 37
it is for primary cultures, sub-cultures grow freely,
forming a dry, wrinkled, or rather folded film (Fig. 31)
of a slightly yellowish or, when old, pinkish tinge,
and possessing a faint, sweet, mawkish smell. The
growth may thicken (Fig. 32) and form roundish
irregular corrugated heaps, and as in Fig. 33, this
mode of growth may be so marked as to produce
projecting, wrinkled, and folded " coral-island " like
masses of considerable size, as may be seen in the
photograph which represents the culture without
magnification.
If the tube contains fluid, as it usually does, the
growth tends to spread over the surface forming
a film. This film growth is characteristic of the
culture in fluid media, and the extent of the growth
in solid media is largely dependent on the culture
material remaining moist.
When freshly isolated the bacillus grows only
within a narrow range of temperature ; from 29 C.
to 42 C. Its optimum temperature is about 37 C.
After culture in artificial media for some genera-
tions the growth appears at an earlier date, and
the culture is freer and more rapid than when first
isolated, while the range of temperature within
which growth occurs appears to extend.
When the glycerin e-sugar-agar medium was first
38 BACILLUS TUBERCULOSIS
introduced considerable stress was laid on this
increase in saprophytic character, but, though some
modification undoubtedly occurs, yet part of the
effect attributed to the medium was due to the
fact that B. tuberculosis avium was employed for
cultivation, and this is now recognised as being a
distinct variety differing considerably from the
mammalian tubercle bacillus.
In culture (Fig. 29) the bacillus presents almost
the same morphological characters and staining
reactions as when in the sputum. The beading,
though not so regular, is nearly equally marked,
but the fine slender bacillus becomes, as a rule,
thicker and coarser, and often presents enlarged
extremities.
Under certain conditions long branched forms
appear in the culture, which resemble closely the
forms which are shown in Fig. 14. These forms
have been studied by Coppen Jones, Babes, and
others, and are usually an evidence of saprophytic
life and small virulence.
Fig. 34 is a photograph of a section through a
tubercular nodule stained with fuchsine and methy-
lene-blue. The centre of the field is occupied by
the characteristic giant cell, with the pale un-
differentia ted central portion of necrosed caseating
' "" -
>'i
FIGS. 31, 32, 33. B. TUBERCULOSIS HOMINIS.
Culture on Glycerine-Glucose- Agar. i : i.
FIG. 34. B. TUBERCULOSIS.
Section of Bovine Lymphatic Gland, Giant Cell, stained as
Fig. 25, apochromat, Projection ocular 6. x 370.
FIG 31.
. 33.
FIG. 34.
BACILLUS TUBERCULOSIS 39
material and well-stained peripheral fringe of nuclei.
As to the origin of these giant cells and the his-
tology of tubercle, it is not within the province of
this book to speak. Within the giant cell and
collected near the nuclei are seen numerous bacilli.
The general arrangement is peripheral and radiate.
In the tissue around the giant cell may be observed
portions of the tubercle where necrotic changes
are commencing, as shown by the poor and partial
staining of the nuclei and other portions, where
this change is so complete that the staining power
of the tissue is completely absent.
BACILLUS SMEGMATIS
THE B. Smegmatis (Fig. 35) has already been referred
to in speaking of the B. Tuberculosis in urine. It
was originally described by Alvarez and Tavel, and
its relation to the B. Syphilidis of Lustgarten sug-
gested. The bacillus resembles closely in size and
morphology the B. Tuberculosis, though it is some-
what more variable in length, and is not so definite
in form ; its extremities are often pointed. It is
found in considerable numbers, and often in heaps,
lying within and between the epithelial cells in the
smegma. In its staining reaction it resembles the
tubercle bacillus, but, though it resists decolorisa-
tion by acids and is thus differentiated from B.
Syphilidis, its colour is removed by the action of
alcohol. It has not been cultivated and is not
inoculable.
te .KfnssniS {Kttuqo
OOOT x /) iK
f 1r,m<
?I -.<>? .or'-J
ajsl
FIG. 35. B. SMEGMATIS.
Cover Glass Preparation from Preputial Smegma, stained
as Fig. 25, j^ apochromat, Projection ocular 6. x 1000.
FIG. 36. BACILLUS LEPR^ (BORDONE UFFREDUZZI).
Cover Glass Preparation of pure Culture, Carbol-Fuchsine,
decolourised with Nitric Acid 25 per cent., ^ apochromat, Pro-
jection ocular 6. x 1000.
of
FIG. 35.
\
* r
' /-
, y
FIG. 36.
LEPROSY (BACILLUS LEPIU3)
IN the tissues of patients suffering from tubercular
Leprosy Hansen, in 1874, discovered a bacillus
which,. from its constant relation to the lesions and
the large numbers in which it occurred in the diseased
tissues, was, with probability, regarded as the cause
of the disease. The same bacillus was subsequently
discovered, but in very much smaller numbers, in the
affected nerves and maculae of cases of anaesthetic
leprosy.
The bacillus found in the leprotic tissues closely
resembles the tubercle bacillus, and is an immobile,
fine, rod-shaped organism, 3-5 /* in length, reacting
to stains as does the B. Tuberculosis, and showing
the same beaded appearance. It is said to differ
from the tubercle bacillus in that it is longer,
straighter, stained more easily, and by methods
which leave the tubercle bacillus unstained, and in
that it resists decolorisation even more strongly
than this latter bacillus. It also shows more irregu-
42 LEPROSY (BACILLUS LEPHJE)
larity in shape than the B. Tuberculosis, being some-
times pointed and sometimes swollen at the extremi-
ties. All these differential characters are inconstant
and untrustworthy. Organisms corresponding to the
typical form and variants from that form may be
found in the photographs.
All attempts to procure undoubted cultures and
successful inoculations with the supposed cultures
have hitherto failed.
The most promising cultures have been obtained
by Bordone Uffreduzzi (Turin) from bone marrow,
and by Gianturco (Naples) from a non-ulcerated
nodule. These independent observers appear to
have isolated a bacillus which in morphology and
staining reaction resembled the B. Leprae of the
tissues, and was not B. Tuberculosis. The bacillus
isolated by Uffreduzzi is depicted in Fig. 36, and is
characterised by the extreme segmentation and the
swelling of the extremities. In late sub-cultures the
specific staining reaction appears to be lost and the
bacillus presents such branched forms as are seen in
Fig. 14. These branched forms also occur in cultures
of B. Tuberculosis.
Attempts to inoculate directly from the diseased
tissues, whether in man or in animals, have not been
much more successful than the attempts with
LEPROSY (BACILLUS LEPR^E) 43
cultures, though a measure of success seems to have
been obtained by Arning, in man, and by Melchor
and Orthman, in animals.
The bacillus has been found in nearly every organ,
tissue, and secretion of lepers. Though occasionally,
during the leprotic fever, found in the blood, it is
chiefly spread by means of the lymphatics, and is
associated with and produces its chief lesions in the
connective tissues. The characteristic lesions pro-
duced are granulomata, but the true giant cell of
tubercle is rare. In the skin (Fig. 37), after a pre-
liminary stage of hypertrophy of the papillae, these
become flattened out and the tissue is the seat
of a considerable sclerosis. In this sclerosed tissue
islands of small-celled inflammatory growth occur,
and in those nodules large numbers of bacilli are
found both within the cells and in the intra-cellular
spaces. Besides the great number of bacilli, the
large " Lepra cells" constituting the circular, vacuo-
luted dark patches in the figure are highly charac-
teristic of the leprotic lesions.
The origin of the lepra cells is still a subject
of dispute, and opinions differ as to whether they
are really cells crowded with bacilli or masses of
bacilli occupying lymphatics. Though the former
theory has not been disproved, there is a growing
44 LEPROSY (BACILLUS LEPR.E)
tendency, as a result of recent work, to regard these
bodies as bacillary thrombi. On examination with
a high power they are seen to consist of globular
masses of bacilli crossing one another in all directions
and lying embedded in a hyaline material which is
possibly the result of the degeneration of the
bacillus or its sheath. The bacilli tend to arrange
themselves concentrically with the circumference of
the mass, and to outline the vacuoles which occur in
the cells (Fig. 39). The bacilli in these cells are
usually very irregularly stained and much dotted,
and are so intermingled that it becomes difficult
to separate the individual microbes. This is the
case with the two large masses shown in the photo-
graph, but in the smaller and thinner group which
lies midway between them, as also at the periphery
of the larger masses, single greatly fragmented
bacilli can be made out.
With a magnification of 1000 diameters a section
of a leprosy nodule presents the appearance shown
in Fig. 38, where the stiff, straight tubercle-like
bacilli are seen scattered in very large numbers
throughout the tissues, and lying some within the
cells and some external to them. There are
numerous transition forms between the small
bacillus- containing cells of the granulation tissue
ii-)i I ->-..' i_o';'J.
7o noit
FIG. 37. BACILLUS LEPR^E.
Section of Skin, stained as Fig. 25, 24 mm. apochromat,
Projection ocular 6. x 70.
FIG. 38. BACILLUS LEPR.E.
Section of Skin, stained as Fig. 25, T \, apochromat, Projec-
tion ocular 6. x 1000.
FIG. 37.
- %>,**
K*.r
FIG. 38.
LEPROSY (BACILLUS LEPR.E) 45
and the large cell to which, more particularly, the
name Lepra cell is given. The latter are commonest
in the older tissues. These bacilli do not extend
beyond the Malpighian layer. The appearances
presented by the skin are reproduced in affected
mucous membranes, especially in the la,rynx-
Affected nerves show an interstitial neuritis with
large numbers of bacilli on the connective tissue.
The internal organs, especially the liver, spleen, and
testicle, are studded with granulomata crowded
with the characteristic microbe.
That the disease is infectious to some extent
there can be no doubt, but the mode of origin and
the exact methods by which it is spread are still
unknown.
BACILLUS MALLEI (GLANDERS)
THE lesions produced by this micro-organism are,
like those occurring in Tubercle and Leprosy, ranged
in the group of granulomata, and this constitutes a
pathological link between the three diseases, though
the B. Mallei differs considerably from the micro-
organisms of the other two disorders. The bacillus
was isolated in 1882 by Loffler and Schiitz, and the
disease reproduced by the inoculation of the pure
cultures.
The organism is found in large numbers in the
rapidly suppurating lesions of glanders, and in the
granulomatis, as well as in the pustules of the
eruption which not unfrequently occurs in the course
of the disease. A preparation from such a pustule is
shown in Fig. 40. The bacillus, which is present in
considerable numbers, is a small, straight, fine
organism, somewhat resembling the B. Tuberculosis,
but, as a rule, decidedly thicker. It measures
usually T5-3 u by '25-'4 p. It is sometimes found
.
.0001 x
-iii Tniuoo pnh^anoqrnoD ,j/:moirfo
ni dtu)gfj4 j'tioii ij. : '
iioi- ' M
.0001 x
FIG. 39. BACILLUS LEPR.E.
Section of Skin " Lepra Cell "stained as Fig. 25, apo-
chromat, Compensating ocular 12. x 1000.
FIG. 40. BACILLUS MALLEI.
Cover Glass Preparation, Material from Pustule in
Man, Carbol-Fuchsine, ^ apochromat, Projection ocular 6.
x IOCKX
FIG. 39.
FIG. 40.
BACILLUS MALLEI (GLANDERS) 47
in pairs and occasionally, though rarely, in longer
chains. It differs from the tubercle bacillus in the
readiness with which it parts with its stain ; all
attempts at differentiation, and even the use of
alcohol in dehydration robbing the bacillus of its
colour. It is not stained by Gram's method. As in
the tubercle bacillus, the protoplasm is segregated
and the organism beaded, but very frequently, in
the shorter forms at least, this segregation leads to
polar staining, the bacillus presenting a clear un-
stained space in the middle while the two extremities
are deeply coloured. Examples of " beading " and
" polar " staining may be seen in the photograph.
Cultures from such purulent material can be
obtained on agar (or, better, on glycerine agar),
bouillon, blood serum, and potato at 37 C.
On agar it forms a rather thick and decidedly
glutinous layer ; in bouillon a general, rather slight
turbidity, arid on potato a thick, brown, viscid,
honey-like growth, which is highly characteristic.
Preparations from such cultures (Fig. 41) show
bacilli of very varying length, ranging from coccoid
forms to fairly long filaments. The cultures are
very polymorphic and prone to the production of
involution forms. The beading and polar staining
occur in the cultures. The bacilli from cultures do
48 BACILLUS MALLEI (GLANDERS)
not stain very readily, owing, it would seem, to the
protective slimy envelope which gives to the growth
the gelatinous character which has been mentioned.
Susceptible animals e.g., guinea-pigs succumb to
subcutaneous and intra-peritoneal inoculations ; the
internal organs are studded with the characteristic
lesions. In the male guinea-pig the testicles are
peculiarly liable to suffer after intra-peritoneal in-
jection, a severe epididymitis and orchitis being set
up. This reaction in the animal is very useful in
the diagnosis of glanders in man. A section of
testicle from such an infected animal is represented
in Fig. 42. The lesion figured is a very early one,
and the alterations in the tissue correspondingly
slight, but a group of bacilli is seen. The organisms
are often met with in the cells.
A substance, "mallein," corresponding both in
origin and in specific action to tuberculin, has been
obtained.
It is doubtful whether susceptible animals have
been successfully immunised.
. i a'^oXM fey jfti 0*9. i ^ .91 ''f
,oirJo4 no oiuilnO' jiibiteijjqoi*! easIO
.]HJ
: . -jj. ..'._
FIG. 41. BACILLUS MALLEI.
Cover Glass Preparation, Culture on Potato, 48 hours'
growth, Carbol-Fuchsine, ^ apochromat, Projection ocular 6.
x 1000.
FIG. 42. BACILLUS MALLEI.
Section of Testis of Inoculated Animal, Methylene Blue,
apochromat, Projection ocular 6. x 1000.
.ala
"
r
FIG. 41.
s
FIG. 42.
PYOGENIC ORGANISMS
A VERY large number of organisms possess, amongst
other properties, a pyogenic power ; and there are
not a few with whom this pyogenic function seems
to be the principal one. Amongst these latter,
however, there are three which, from the frequency
with which they occur in localised collections of pus,
in spreading purulent inflammation, and in pyaemia
and septicaemia, are of much greater importance
than the rest. These three microbes are : Strepto-
coccus Pyogenes, Staphylococcus Pyogenes Aureus,
and Staphylococcus Pyogenes Albus.
STREPTOCOCCUS PYOGENES
THE Streptococcus Pyogenes is associated with
spreading inflammation of the erysipelatous type,
but is also found in local abscesses and many other
suppurative conditions. In pus (Fig. 43) it occurs
in chains of spherical cells of extremely variable
length, sometimes consisting of only three or four
members, and sometimes of thirty or forty. The
chains are usually free and extracellular. The indi-
vidual cells are about 1 ^ in diameter, are readily
stained by any of the basic aniline dyes, and resist
decolorisation when stained by Gram's method.
Though frequently the organism consists of a series
of regular and equidistant cells, yet often, as in the
figure, the cells appear arranged in pairs separated
by a smaller space than that which divides the
pairs from one another. As has already been men-
tioned, in speaking of the varieties of micro-
organisms, this is probably a result of the method
of growth. In size of cells, irregularity in size of
; ,
FIG. 43. STREPTOCOCCUS PYOGENES.
Cover Glass Preparation, Pus, Carbol-Fuchsine, T V apo
chromat, Projection ocular 6. x 1000.
FIG. 44. STREPTOCOCCUS PYOGENES.
Gelatine Culture, i : i.
-
FIG. 43-
STREPTOCOCCUS PYOGENES 51
the individual cells, length of chains, and variability
in the spaces between the cells the streptococcus
shows much variety ; many species have been de-
scribed and named e.g., Strept. Longus, Brevis,
&c. Streptococcus Erysipelatosus appears to be one
of the varieties of this organism, and great differ-
ences in virulence are noted in cultures from
various sources. From such pus as that described
cultures of the organism which grows between the
temperatures of 18 C. and 42 C., with an optimum
of 37 C. can be obtained on gelatine or agar or in
bouillon. The organism is a facultative anaBrobe.
The growth on gelatine (Fig. 44) forms a series
of small discrete, semi transparent, dewdrop-like
circular colonies, and produces no liquefaction of the
gelatine.
On agar the growth closely resembles that on
gelatine, and there is often a very free growth in the
fluid of condensation which collects at the bottom
of the tube.
As in the morphological, so in the cultural
characteristics, considerable variation is met with,
affecting the freedom of the growth and the size
arid density of the colonies. In all cases, however,
the colonies tend to keep separate and never reach
any large size, while their vitality is not lasting,
52 STREPTOCOCCUS PYOGENES
and unless frequently transplanted sub-cultures often
fail. The media most suited to secure the continued
vitality of the organism, and also to preserve its
pathogenicity, are those consisting of admixtures of
blood serum or ascitic fluid with bouillon (Mar-
morek, &c.).
Cover-glass preparations made from such cultures
present the appearance shown in Fig. 45. The
length of the chains of cells depends in part on the
humidity of the medium ; the longer ones are found
in bouillon cultures or in the condensation fluids of
agar.
In fresh preparations from these fluids the organism
is seen to form very long intertwisted and convoluted
chains, which are generally much broken up in cover-
glass preparations. It is probably due to this inter-
twisting that the microscopic characters of the cul-
tures in bouillon are to be referred viz., a primary
turbidity with a subsequent rapid clearing of the
fluid and deposit of flocculi at the bottom of the
tube.
In cultures the same varieties are met with as
have been described as occurring in pus, and are
perhaps even more marked. The pathogenic affec-
tions produced by inoculations of the pure cultures
vary greatly with the changing virulence of the
.0001 x
.0001 x ^ IP- I MOO noito^ioi^
FIG. 45. STREPTOCOCCUS PYOGENES.
Cover Glass Preparation, Bouillon Culture, Gram, T V*apo-
chromat, Projection ocular 6. x 1000.
FIG. 46. STAPHYLOCOCCUS PYOGENES AUREUS.
Cover Glass Preparation of Pus from Abscess, Gram and
Eosin, T V apochromat, Projection ocular 6. x 1000.
FIG. 45.
STREPTOCOCCUS PYOGENES 53
organisms and with the method and seat of the
inoculation. Subcutaneously inoculated, it may give
rise to an erysipelatous inflammation, arid the
organisms are found filling the lymphatics at the
margin of the inflamed patch ; or it may give rise
to a localised abscess or a spreading cellulitis. In-
jected intravenously, it gives rise to an acute septi-
caemia, with a blocking of the capillaries of the
internal organs with microbes. If certain conditions
are associated with the injections, pyaemia results,
and the secondary abscesses themselves contain the
streptococcus.
By successive passages through animals and cul-
tures in the serum-bouillon media mentioned above
organisms of extreme virulence may be obtained.
By injections of graduated doses a condition of
resistance may be established in animals, and there
appears to be some ground for believing that the
serum of such protected animals may itself protect
other animals from streptococcic infection.
STAPHYLOCOCCUS PYOGENES
AUREUS AND ALBUS
IN the pus from a large proportion of abscesses,
boils, pustules, and other similar suppurative foci
will be found either the Staphylococcus Pyogenes
Aureus or Albus the former the more frequently.
These two organisms resemble one another closely,
and, indeed, might be regarded as identical, but that
cultures of the former produce a golden yellow pig-
ment wanting in the latter. In pus (Fig. 46) the
staphylococci occur as irregular, usually small groups
of spherical cells lying free in the fluid. The indi-
vidual cells measure *8 p in diameter, and are easily
stained by basic dyes and by Gram's method. From
pus containing them the staphylococci are very
readily cultivated on any of the ordinary nutrient
media, and at temperatures between 14 C. to 42 C.
They are facultative anaBrobes. On agar they form
copious, thick, opaque, moist growths resembling a
streak of oil paint, yellow in the case of Staphylo-
FIG. 47.
FIG. 48.
FIG. 47. STAPHYLOCOCCUS PYOGENES AUREUS.
Gelatine Culture, i : i.
FIG. 48. STAPHYLOCOCCUS PYOGENES AUREUS.
Cover Glass Preparation, Agar Culture, Gentian-Violet,
apochromat, Projection ocular 6. x 100.
phylocoeoi
''' - 'A HoJYH 1 !/!^ .^f .,:>i">J
I .1 : i .aintlw'J on/j
**
>
JaloiV fLBitaoO .
tx)i x .d
STAPHYLOCOCCUS PYOGENES AUREUS 55
coccus Pyogenes Aureus, and white in that of
Staphylococcus Pyogenes Albus.
Similar growths occur on gelatine, but the medium
is rather rapidly liquefied, and the character lost.
A stab-culture of Pyogenes Aureus in gelatine is
shown in Fig. 47, and appears as a funnel-shaped
depression of liquefied gelatine rendered turbid by
the suspended growth. The funnel is fairly wide,
and slopes regularly and not rapidly from the top
to the bottom of the culture. In time the whole
tube would be liquefied. In cover-glass pre-
parations the organism is shown in Fig. 48, and
appears as a congeries of equal-sized spherical
cells, showing a tendency to arrange themselves as
diplococci. It is as diplococci that they generally
appear when examined without staining in drop
culture, while tetrads and short chains are not
uncommon.
These organisms, like the streptococcus, vary
considerably in their virulence, but form cultures
which are much more copious and possessed of
much greater vitality, so that sub-culture is
easy.
The staphylococci in subcutaneous injection or
inunction (even with intact skin) give rise to local
suppuration but not to inflammation of the ery-
56 STAPHYLOCOCCUS PYOGENES AUREUS
sipelatous type. They also on intra- vascular injec-
tion produce septicaemia and pyaemia, Immunity
against these infections has not been artificially
produced.
MICEOCOCCUS GONORRHCELE
THE specific purulent urethritis of Gonorrhoea was
shown by Neisser to be associated with the pre-
sence of a micrococcus differing from those found in
ordinary pyogenic processes. By culture and inocu-
lation the microbe was shown, chiefly by the work
of Neisser and Bunn, to be the cause of gonorrhoea.
The gonococcus in goiiorrhceal pus is seen
(Fig. 49) to be a diplococcus occurring in groups
varying from 8 or 10 to 20 or 30, and these groups
are contained almost invariably within the pus cells.
The individual cells are about '8 p in diameter, and
are frequently flattened or reniform, the flattened sur-
faces being apposed. They stain readily with basic
dyes, but are differentiated from the Staphylococci
of ordinary pus in that they do not stain by Gram's
method. They are found in the pus of gonorrhceal
ophthalmia, and also have been described as occur-
ring in the articular fluid in cases of gonorrhceal
rheumatism.
58 MICROCOCCUS GONORRHCEJE
They are difficult to cultivate, grow best on
media containing blood serum, and inoculations,
except in the human subject, do not appear to have
succeeded.
FIG. 49.
FIG. 50.
FIG. 49. MICROCOCCUS GONORRHCEA.
Cover Glass Preparation from Urethral Pus, Loffler, ^
apochrornat, Projection ocular 6. x 1000.
i-'ij'U'.rie ^laadsr .-of patients db*ifl ftvBa enteri
FIG. 50. B. TYPHOSUS.
Section of Mesenteric Gland, Methylene Blue, 24 mm. apo-
chromat, Projection ocular 6. x 100.
U.V6 ot the li.
l>i .-" '
.-rri Ixniil pt" ^aKiO lovo'j
oooi x n
.mm*!
BACILLUS TYPHOSUS
DISCOVERED and described by Eberth in 1880, the
B. Typhosus was isolated and its causal relation to
enteric fever proved by Gaffky in 1884.
In sections of the spleen, liver, or swollen
mesenteric glands of patients dead from enteric
fever, especially in the earlier stages of the disease,
are found scattered rather large colonies of bacilli,
easily seen with a low power and having frequently
an arterial distribution. The tendency of the bacilli
to collect into colonies in the organs is a marked
feature of the B. Typhosus, and is shown in Fig. 50,
which represents a section through a mesenteric
gland. The two large dark patches are the colonies
of bacilli. In the internal organs, as a rule, the
colonies are not associated with much change in the
.surrounding tissues, but in the intestine inflamma-
tory arid necrotic alterations are the rule.
The tissue round the colonies of Fig. 50 is
necrosed and has lost all power of staining.
60 BACILLUS TYPHOSUS
If such a colony is examined with a high power it
is seen to be composed of numerous short, thick,
round-ended bacilli (about 2 p by '8 /a), which are
present either as single cells or occasionally as short
chains. They are generally heaped together so that
individual bacilli can hardly be distinguished except
at the margins (Fig. 51).
The bacilli in sections stain with methylerie-blue
and fuchsine, but are easily decolorised, and are
therefore not easily differentiated. This organism
does not stain by the method of Gram.
From such infected organs, especially the spleen
and gall bladder, pure cultures may be obtained by
employing any of the usual separation methods.
Should gelatine plate cultures kept at 21 C. be
employed, colonies develop which, at first small,
rather clear, and very faintly granular, gradually, if
on the surface, assume the characters seen in Fig. 52.
The colony is greyish white, somewhat transparent,
and iridescent. It is raised in the centre and presents
a thin, spreading, festooned margin. The surface is
marked by groovings and ridges which run from the
centre to the periphery, but are crossed by other
ridges concentrically arranged. The figure shows
well the superficial markings, but exaggerates the
sharpness of outline and the raised character of the
f \jnoIoO 18
.ttaaoH4YT : .H
-d x Jjjmrwborjj; .fnnjgjr
FIG. 51. B. TYPHOSUS.
Same Preparation as Fig. 50, Bacilli at edge of Colony,
i apochromat, Projection ocular 6. x 550.
FIG. 52. B. TYPHOSUS.
Colony on Gelatine, Zeiss, 35 mm. apochromat. x 6
FIG. 51.
FIG. 52.
FIG. 53.
If
-^/'V^'>
'-^/j^;*^
->-, ''/<\/^-
' *\'. ^-i',
?><
FIG. 54.
FIG. 53. B. TYPHOSUS.
Gelatine Culture, i : i.
FIG. 54, B. TYPHOSUS.
Cover Glass Preparation, Agar Culture, 48 hours' growth,
Carbol-Fuchsine, yW apochromat, Projection ocular 6. x 1000.
..-' 1
llrt.^il^^HKoiij
BACILLUS TYPHOSUS 61
colony, which is more filmy and spreading. The
gelatine is not liquefied. A streak sub-culture in
gelatine shows exactly the same characters and pro-
duces a semi-transparent iridescent growth spread-
ing over the surface of the medium with a thin filmy
waved margin to be well seen on each side of the
growth represented (Fig. 53).
No gas bubbles are produced when the organism
is cultivated in gelatine containing glucose (compare
Fig. 61, B. Coli) and milk is not coagulated.
Cover glass preparations from such a culture or from
similar cultures on agar show organisms like those
described in the colonies (Fig. 54). They are, how-
ever, often longer than when found in tissues and
chains of several apposed cells and long filamentous
forms are by no means rare, especially in bouillon
culture. The bacilli are, compared with B. Coli,
longer, thinner, and less frequently coccoid in form.
Cultures can be obtained at temperatures ranging
from 4 C. 46 C. The optimum temp, is about
37 C., and the thermal death point of the cell
about 60 C.
On some media, especially potato, the organisms
show a tendency to segregation of the protoplasm,
so that when stained the extremities of the cell
are deeply coloured and the centre is clear and
62 BACILLUS TYPHOSUS
apparently vacuolated. This appearance polar
staining was supposed to be evidence of spore
formation, but Buchner has shown that this is not
the case. A preparation showing such polar stain-
ing with the central " clear space " is represented in
Fig. 55, and the resemblance to the appearances
presented by true spore formation will be seen.
A culture of B. Typhosus examined in a " hang-
ing drop " is seen to be actively motile, and is found
to owe this motility to the possession of numerous
long flagella. Fig. 56 shows these flagella to be
many times the length of the bacillus, to be very
numerous, and to pass out from all parts of the cell
periphery so as to form the so-called " spider cells."
The flagella are decidedly more numerous in the
case of B. Typhosus than in that of B. Coli, and
usually vary from about 10-18.
With pure cultures of B. Typhosus a fatal disease
can be produced in many of the lower animals,
though the virulence of the cultures rapidly dis-
appears. As a rule, the disease produced is acute
and toxic in its character, but recently a chronic
disease resembling the enteric fever of man has been
produced in rabbits by feeding them on infected
food. Against the disease produced by inoculation
animals may be immunised. The blood serum of
n;io c i Sniworfa ^lujiO noJIiuoH t aoftiq3i 56. B. TYPHOSUS.
Cover Glass Preparation, Flagella, Nicolle and Morax
modification of Loffler's method, T V apochromat, Projection
ocular 6. x 1000.
I
'
\
FIG. 55.
<>';>
FIG. 56.
BACILLUS TYPHOSUS 63
such protected animals is found, when added in
small quantity to a broth culture of B. Typhosus,
to produce an agglutination of the bacilli ; so that
they lose their motility, collect into flocculi visible
to the naked eye, and are deposited in a layer at
the bottom of the tube, while the supernatant fluid
becomes clear. A similar action takes place if the
serum of a patient suffering from typhoid fever
(except in the first few days of the disease) be
added to the culture. This reaction does not take
place with serum from other sources (except occa-
sionally), nor does this specific serum react thus
with cultures of organisms other than the B.
Typhosus. Our knowledge of these facts arose
from the work of Pfeiffer on Sp. Cholera, was ex-
tended by Gruber and Durham, and was applied by
Widal to the diagnosis of enteric fever in man.
The agglutinating action can be observed under the
microscope. Fig. 57 represents the clumping power
exerted by serum from a case of typhoid upon the
bacillus. Three large masses of agglutinated bacilli
are seen in the field, while the rest of the prepara-
tion shows scarcely any micro-organisms ; and this
clearing of the general field is almost as charac-
teristic as the formation of clumps. A red blood
cell is seen at the upper part of the field.
BACILLUS COLI
RECOGNISED as a normal inhabitant of the human
intestine, and as an organism very widely spread in
nature, much attention has of late been directed
towards this bacillus owing to the difficulty which
exists in distinguishing it from the B. Typhosus and
also from the supposed pathogenic power which,
under certain conditions, it possesses.
The Bacillus Coli is a short round-ended motile
bacillus, aerobic, non-sporebearing, and producing
no liquefaction in gelatine (Fig. 58). In morpho-
logy it is very variable, sometimes appearing as a
short figure of eight bacillus, and sometimes as a
distinctly cylindrical organism. In length it varies
from '8 fjL to 3 ^u, and is about '5 n in thickness.
Two forms are shown in Figs. 58 and 59. Com-
pared with B. Typhosus, it is, as a rule, shorter and
less bacillary, is less actively motile, and possesses
fewer flagella (4-8). Like that organism, it is not
.stained by Gram's method. In culture in gelatine,
,Jnoc ff tntnl irons?! yd jioih'.titjijI^A
.oof x .d BBltfoo fiobo.'.jjp'jS ,jmo*iriooq^
JJO^ ,H--.^ ,
x .u ijiluoo noit
FIG. 57. B. TY^HOSUS.
Agglutination by Serum from Typhoid Patient, unstained ,
apochromat, Projection ocular 6. x 400.
FIG. 58. B. COLI COMMUNIS.
Cover Glass Preparation, Agar Culture, 48 hours' growth,
" Bacillary " form, Carbol-Fuchsine, ^ apochromat, Projec-
tion ocular 6. x 1000.
FIG. 57.
FIG. 58.
FIG. 60.
FIG. 61.
FIG. 59. B. COLI COMMUNIS.
Cover Glass Preparation, Agar Culture, 48 hours' growth,
" Coccoid " form, Carbol-Fuchsine, T \ apochromat, Projection
ocular 6. x 1000.
FIG. 60. B. COLI COMMUNIS.
Gelatine Culture, i : i.
FIG. 61. B. COLI COMMUNIS.
Stab Culture in Glucose-Gelatine, i : i.
.0001 x
BACILLUS COLI 65
whether in plates or as a streak culture, the growth
of B. Coli closely resembles that of B. Typhosus,
but is somewhat more rapid and shows an even
greater tendency to form a filmy spreading growth
(Fig. 60).
B. Coli possesses the power of fermenting sugars
of both the C 6 H 12 O 6 and C 12 H 22 O n groups, and as
a consequence coagulates milk and produces gas in
fluid or solid media containing these sugars. A
gelatine glucose tube inoculated in stab is rapidly
dislocated by the gas bubbles, and presents the
appearance shown in Fig. 61. B. Typhosus, under
the same conditions, produces no gas and no coagu-
lation of milk, and the two organisms are further
distinguished by the property possessed by B. Coli
of producing indol in solutions of peptone and the
absence of this power in the case of B. Typhosus.
DIPLOCOCCUS PNEUMONLE
(FRANKEL)
IN a large proportion of cases normal saliva contains
a capsulated micro-organism, usually appearing as a
diplococcus, which, when injected into the rabbit
produces a rapidly fatal septicaemia. First noticed
by Pasteur (1881) in the saliva, and studied by
Sternberg in relation to the rabbit septicaemia pro-
duced by its injection, this micro-organism, by the
work of Talamon, Frankel, Netter, Weichselbaum,
and others, was gradually connected with, and finally
regarded as, the cause of croupous pneumonia in
man. A normal inhabitant of the mouth, this
microbe requires for the development of its patho-
genic properties conditions which are at present
but ill understood. The production of a typical
pneumonia by its action seems to imply a con-
siderable power of resistance in the infected animal ;
otherwise a septicaemia is produced. The organism
possesses pyogenic properties and is found in otitis
FIG. 62.
FIG. 63.
FIG. 62. DIPLOCOCCUS PNEUMONIA (FRANKEL).
Cover Glass Preparation, Peritoneal Fluid of Inoculated
Animal, Friedlander's method, J.,- apochromat, Projection
ocular 6. x 1000.
FIG. 63. DIPLOCOCCUS PNEUMONIA.
Agar Culture, i : i.
I
.0001 x .c)
DIPLOCOCCUS PNEUMONLE (FKANKEL) 67
media, cerebro-spinal meningitis, and many other
diseases.
The cultures are both infective and toxic. Sus-
ceptible animals can be protected against the viru-
lent organism, but this protection is not generally
considered to extend to the toxins. Protection is
afforded by the blood serum of immunised animals,
or of convalescents from pneumonia (Klemperer).
As found in the saliva, in the sputum of pneumonic
patients, in pneumonic lungs and in the blood, pleural
and peritoneal exudations of inoculated animals the
organism appears as a minute diplococcus about '5 /u
to 1 /u in diameter (Fig. 62) surrounded by a well-
marked capsule. The individual cells are elongated
and hastate in shape, and are placed with their broad
bases in apposition when united as diplococci. This
is the typical form, but variations from it are very
common and many cells are simply spherical.
The organism is stained by Gram's method.
Between the temperatures 22 C. and 42 C. the
microbe can be cultivated, but unless special pre-
cautions are taken the cultures are scanty, the
virulence rapidly lost, and the vitality persistent
for a short time only. On agar, which is much im-
proved as a culture medium by being covered with a
layer of blood, the culture (Fig. 63) occurs as a
68 DIPLOCOCCUS PNEUMONIA (FRANKEL)
delicate growth of small, circular, discrete colonies
resembling closely those of Streptococcus Pyogenes.
The density of the colonies varies with the medium,
but they are generally transparent and dewdrop-like
with a slight thickening of the centre.
Preparations from such a culture show character-
istic diplococci, but without capsule ; this is lost in
all forms of culture. In fluid media the micro-
organism occurs not only in the coccus form but also
as moderately long streptococci. The preparation
(Fig. 64) is from an agar-blood culture, but a few
chains of 3 or 4 elements are present. The hastate
shape of the individual cells is retained.
r^ -^ l
. :5Bl
lo bh/PI loaoiho c J jiuiiBir.cpiS sauIO
,5 ifiiuoo noitoaio-^I ,iBnioiiiooq.^^ ,i'jIotV-nr>HiioO .
.0001 x
FIG. 64. DIPLOCOCCUS PNEUMONIA (FRANKEL).
Cover Glass Preparation, Agar (Blood) Culture, Gram,/.,
apochromat, Projection ocular 6. x 1000.
FIG. 65. B. PNEUMONIA (FRIEDLANDER).
Cover Glass Preparation, Peritoneal Fluid of Inoculated
Animal, Gentian-Violet, T ^ apochromat, Projection ocular 6.
x 1000.
FIG. 64.
FIG. 65.
BACILLUS PNEUMONIA
(FRIEDLANDER)
IN the sputum and in the secretions from the lungs
of pneumonic patients a second capsulated organism
is frequently found. It was originally described
and cultivated by Friedlander and thought to be the
cause of croupous pneumonia. Like the preceding
organism it is found in the normal mouth and
associated with the formation of pus. It is larger,
more bacillary, much more easily cultivated and less
pathogenic than the Diplococcus Pneumonise, and is
further distinguished by not staining by Gram's
method. It gives rise when injected into the mouse
to a fatal septicaemia, and Fig. 65 shows the bacillus
as it occurs in the peritoneal exudation of such an
infected animal ; it should be compared with Fig. 62.
The organism is seen to vary from an almost coccoid
form (at the lower part of the figure) to a fairly long,
plump, round-ended bacillus. One bacillus has
become detached in the preparation and lies a little
70 BACILLUS PNEUMONIA (FRIEDLANDER)
above its empty capsule. The organism grows easily
and at the ordinary temperature as well as at 87 C.
It forms a non-liquefactive nail-shaped growth in
gelatine stab culture, a copious turbidity in bouillon,
and a thick very gelatinous culture on agar. The
capsule is lost in culture though the gelatinous
material often found in the cultures gives rise to an
appearance resembling a capsule. The preparation
(Fig. 66) is from an agar culture and shows the
rather broad round-ended bacillus. The length of
the organism varies greatly and in all cultures many
short coccoid forms occur.
2l/;?f 'lo noiJoofc
x .d 'tBlr'OO noi)
FIG. 66. B. PNEUMONIA,
Cover Glass Preparation, Agar Culture, Carbol-Fuchsim
V apochromat, Projection ocular 6. x 1000.
FIG. 67. B. DIPHTHERIA.
Section of False Membrane, Loffler, apochromat, Projec
tion ocular 6. x 600.
< ' /
FIG. 66.
FIG. 67.
BACILLUS DIPHTHERIA
IN 1873 Klebs described amongst the organisms
found in diphtheritic membranes a small bacillus
which from its constancy he regarded as probably
specific. This opinion was confirmed and the bacillus
isolated by Loffler (1884). The observations of this
investigator were confirmed and extended by Houx
and Yersin by their discovery of the diphtheria
poison, and the production of post-diphtheritic
paralysis after inoculation of the bacillus or its toxic
products. Our further knowledge, especially in
regard to methods of immunisation and the anti-
toxic action of the blood serum of immunised animals,
we owe to Frarikel and Brieger, Kitasato and
Behring, and many other observers.
The bacillus is found in the superficial layer of the
false membranes, and in its purest condition in the
early stages of the disease. Subsequently it becomes
much admixed with other organisms, especially the
72 BACILLUS DIPHTHERIA
Streptococcus Pyogenes, and is often crushed out by
their growth.
The free surface of the false membrane is usually
covered with a mixture of micro-organisms, but im-
mediately below this layer the B. Diphtherias often
occurs almost pure, lying in groups and small colonies
in the necrosed tissues (Fig. 67). This bacillary
zone is generally separated from the infiltrated
deeper tissue by a necrosed but microbe-free
stratum.
The bacillus is a small rod-shaped, non-motile,
Gram-staining organism about the length of the
tubercle bacillus (2 to 3 /*), but somewhat thicker
(7 p). Frequently the organisms show a strong
tendency to arrange themselves parallel to one
another a tendency well seen in Fig. 68, which
represents a preparation made from the nasal secre-
tion of an apparently healthy child, who, however,
was the source of infection for several brothers and
sisters.
The organisms, it will be observed, are to a very
large extent collected within the polynuclear cells,
and the photograph furnishes a good representation
of the phenomenon of phagocytosis.
The bacillus, in both secretion and cultures, fre-
quently presents a swelling and clubbing of the ex-
.0001 x
FIG. 68. B. DIPHTHERIA.
Cover Glass Preparation, Nasal Secretion, Roux's Stain,
apochromat, Projection ocular 6. x 1000.
FIGS. 69, 70. B. DIPHTHERIA.
Gelatine Cultures, i : i.
FIG. 68.
FIG. 69.
FIG. 70.
BACILLUS DIPHTHERIA 73
tremities which results in the production of dumb-
bell and Indian-club shaped organisms. The proto-
plasm of the bacilli tends to segregation, so that the
phenomena of " polar staining " and "banding" of
the bacilli are extremely well marked, and can,
together with the other features mentioned, be
readily observed in the photographs.
Metachromatism is also common, and the organism
is very prone to the production of so-called involu-
tion forms.
If a swab which has been rubbed over the surface
of a diphtheritic membrane be then used to smear
the surface of a solidified blood-serum tube, and the
latter be kept at 37 C. for eighteen to twenty-
four hours, it will be found covered with colonies,
which in many cases consist almost exclusively of
Diphtheria bacilli.
The method of bacteriological diagnosis of diph-
theria by culture, which is conducted as above,
depends on the extreme suitability of the medium
and the temperature for the growth of the diphtheria
bacillus, as compared with the other micro-organisms
generally associated with the specific bacillus.
The colonies formed are discrete, circular, greyish-
white growths which are thickened in the centre,
have a thin and often fimbriated or fissured edge,
74 BACILLUS DIPHTHERIA
and adhere somewhat closely to the serum. On agar
and gelatine the characters of the colonies are as
described on serum, but they are more transparent.
Such gelatine cultures are seen in Figs. 69 and 70.
The former shows a copious growth of minute
colonies, and the latter isolated colonies in which
the characters indicated are well marked.
Growths take place at temperatures between 20 C.
and 42 C., but are very slow at the lower limit ;
the growth on gelatine therefore takes some time
to develop. The optimum temperature is about
37 C.
A preparation made from such a serum culture as
is described above is shown in Fig. 71, and in it will
be noted the clubbing and banding of the bacillus,
as well as the tendency to parallelism already
mentioned.
A similar preparation from an agar culture is
represented in Fig. 72. As a rule, the bacillus from
agar, while it shows clubbed and dumb-bell forms, is
usually shorter and more regular in size than the
same organism grown upon blood serum, and does
not show such marked banding as these latter
cultures. In the photograph there are many so-
called involution forms, and the preparation shows
an unusual degree of irregularity.
'll.ioi ;si 'r/tr.fj-.n' <>>f\) I >vo>
.c) TF.!M:X i'jMftvjjo'i'I t' ,.', .i'tr)^ //:)/{ ,(.') ~f }
AJ'.lOI X
q/i *, ,oiiiJ?. e xjioM ,(."-> tl)
X
FIG. 71. B. DIPHTHERIA.
Cover Glass Preparation, Serum Culture, 24 hours' growth
(37 C.), Roux's Stain, T V apochromat, Projection ocular 6.
X 1000.
FIG. 72. B. DIPHTHERIA.
Cover Glass Preparation, Agar Culture, 48 hours' growth
(37 C.), Roux's Stain, ^ apochromat, Projection ocular 6.
x 1000.
it tliesa latter
fure many -so-
X
FIG. 71.
FIG. 72.
FIG. 73-
6
t'^'%
V^KVV* *LvX:f
t 4^%f
1^ ^r^^^aaj r-
A ** l .<-_-v.llttliii ^- / rf
'*-'-
S'V*
^K-'- '
A ^A
FIG. 74.
FIG. 73. B. DIPHTHERIA.
Cover Glass Preparation, Serum Culture, 72 hours' growth
(37 C.), Roux's Stain, ^ apochromat, Projection ocular 6.
x 1000.
FIG. 74. B. DIPHTHERIA.
Cover Glass Preparation, Gelatine Culture, 72 hours' growth
at 21 C., Roux's Stain, ^ apochromat, Projection ocular 6.
x 1000.
/ r jji^JS a'xuoM ,-,/> "tt)
,OOC>1 X
c'xooM ..'J is Jj;
DOOJ X
BACILLUS DIPHTHERIA 75
As was pointed out by Abbott and is seen in
Fig. 73, the bacillus on blood serum grows out into
extremely long filamentous forms (6 p in length),
which, together with other features, has caused this
organism to be ranked by some observers with the
Streptotrichae.
Variations in the culture material cause variations
in the morphology of the bacillus, but there appear
to be also well-marked varieties occurring in the
false membranes, which show differences both in
form and virulence, and whose differential characters
remain constant in successive cultures on the same
nutrient materials. Among virulent bacilli are well-
recognised long and short varieties.
The effect of nutrient material on morphology is
shown in Fig. 74, which represents a culture on
gelatine of the same virulent organism as that seen
in Fig. 71. The bacillus is much shorter and stains
with much greater regularity, while the " clubbing,"
though still present, is much less marked.
Diphtheria can be produced by the inoculation of
the bacillus or its toxic products, and by various
methods animals can be protected or vaccinated
against either the organism or its poisons. The
blood serum of these protected animals is found to
be itself capable of securing the protection of other
76 BACILLUS DIPHTHERIA
animals when injected into their tissues. The pro-
tection so secured is valid against either the virulent
organism or the poisons produced by the organism.
This protective or " anti-toxic " serum also possesses
therapeutic properties, and secures the recovery of
animals already infected. It is this serum which is
so largely used in the treatment of diphtheria in
man.
.4
FIG. 75.
t
FIG. 76.
FIG. 75. SPIRILLUM CHOLERA ASIATICA (KOCH).
Cover Glass Preparation, Rice Water Stools, Carbol-
Fuchsine, T \ apochromat, Projection ocular 6. x IOOQ.
I identified by Koch ju his stuJy of li^ Egyptian
FIG. 76. SP. CHOLERA ASIATICA.
CoverGlass Preparation, Bouillon Culture, Carbol-Fuchsine,
y^ apochromat, Projection ocular 6. x 1000.
loch;,.'.,) ,IooJri TJJKV/
.pooi x .* -jj,IiJDo
> ' ft l r ,oii!ft
FIG. 77. SP. CHOLERA ASIATICA.
Cover Glass Preparation, Agar Culture, 48 hours' growth at
37 C., Carbol-Fuchsine, ^ apochromat, Projection ocular 6.
X IOOO.
FIG. 78. SP. CHOLERA ASIATICA.
Cover Glass Preparation, Agar Culture, 24 hours' growth at
37 C., Nicolle-Morax-Loffler method, Flagella, ^ apochro-
mat, Projection ocular 6. x 1000.
FIG. 77.
'<*
mWK^^mim
I'..:''-.:- "' :' > / -V-^";'^
FIG. 78.
SPIRILLUM CHOLERA 79
isms already referred to. Many specimens of this
spirillum show, after long sub-culture, a great
tendency to form very flat spirals, and assume an
almost bacillary form. Klein has noted that there
appears to be some material present in the intestinal
secretions which gives the comma bacillus an in-
creased power of staining, so that the flagella may
be demonstrated in such preparations by simple
staining methods which would not succeed with
cultures in the usual media. The organism is
actively motile, and owes its motility to the pre-
sence of a flagellum situated at one pole as is seen
in the illustration (Fig. 78).
The varieties of the cholera spirilla differ in the
number of flagella possessed by them though they
are always situated at the extremity of the cell and
do not usually exceed two or three. The young
short comma organisms are the most actively motile,
the spirilla forms being much less active, but not
entirely motionless.
In some varieties (e.g., Massowah) they are absent
altogether.
The culture on agar forms a rapidly growing, thin,
slightly iridescent film. The cultures on gelatine
have, from the first discovery, been regarded as the
most characteristic, and have been used to distinguish
80 SPIRILLUM CHOLERA
the various spirilla from one another. Unfortunately
the discovery of many varieties of cholera spirilla and
of many allied organisms has tended to diminish the
value of this method of differentiation. The
characteristic growth of the spirilla of cholera in a
gelatine stab culture is shown in the two figures
(Fig. 79) and (Fig. 80) representing such growth at
21 C. after two and four days respectively. Growth
takes place along the whole length of the stab, but
much more rapidly near the surface, and at the
same time liquefaction of the gelatine takes place,
so that the whole assumes the appearance of a
funnel with a very long and narrow neck. The
fluid appears to shrink and the funnel to be occupied
by a refracting air-bubble floating on the upper part
of the culture. This appearance is probably due to
the clearing of the liquefied gelatine owing to the
sinking of the micro-organisms to the bottom of the
funnel. The collecting together and sinking of the
masses of organisms is seen in both figures, but with
greater clearness in the second ; in this the bottom
of the stab is filled with a plug of bacteria. The
rate of liquefaction of the gelatine and the cha-
racter of the resulting funnel of growth is very
variable with the different species of Spirillum
Cholerse.
'eiuod dp ,
' r Jifsfv> i >^i f f o.ni IF, !:
l /;mo*id'joq.K rr:
FIG. 79. SP. CHOLERA ASIATICA.
Gelatine Stab Culture, 48 hours' growth at 21 C. i : i.
FIG. 80. SP. CHOLERA ASIATICA.
Gelatine Stab Culture, 96 hours' growth at 21 C. i : i.
FIG. 81. SP. CHOLERA ASIATICA.
Gelatine Plate Culture, Colony 24 hours' growth at 21 C.
12 mm. apochromat, Projection ocular 6. x 125
FIG. 79 .
;-FlG. 80.
FIG. 81.
SPIRILLUM CHOLERA 81
Plate cultures show signs of growth when kept at
21C. in the first 24 hours, and considerable growth
takes place in 48 hours. When the colonies are
numerous the whole plate assumes a ground-glass
appearance. The individual colonies are irregularly
spherical, rather sharply defined, granular, clear,
and highly refractile. Their appearance is well
expressed by Koch's comparison which likens them
to little heaps of pounded glass (Fig. 81).
At a little later stage the granular character and
refractility increases, the outlines become more
circular, and the edge appears very finely festooned.
The surface of the colony is marked in such a
way that it appears to repeat the festooning of
the edge in concentric and diminishing circles.
With commencing liquefaction the colony becomes
surrounded by a sharp circle of fluid gelatine and the
colony sinks to the bottom of the funnel-shaped
hollow and appears sharply defined against the
refractile zone of liquefied gelatine, while it loses its
characteristic appearance.
The comma bacillus is found in large numbers in
the intestinal contents in cases of cholera and
occasionally penetrates the lumen of the glands and
is found between the epithelium and basement
membrane ; this is scarcely to be wondered at con-
82 SPIRILLUM CHOLERA
sidering the intense desquamative enteritis which
is set up. The organism, however, scarcely ever
becomes generalised and is not found in the blood or
internal organs.
That this organism is the cause of Asiatic cholera
can now be scarcely doubted both on account of its
constant presence in the disease and from the results
of inoculation in both animals and man. It can,
however, undoubtedly be present in the intestines
without causing cholera, and certain little-understood
conditions, e.g., presence of certain microbes, intes-
tinal irritants, disorders of digestion, &c., must
exist in order that the pathogenic effects may be
produced.
Animals and man may be protected against sub-
cutaneous and intra-peritoneal inoculations of the
virulent microbe, but it is doubtful if immunity
can be secured against infection by the gastro-
intestinal tract.
The disease appears to be toxic rather than
infective.
The phenomena of agglutination similar to that
which occurs with Typhoid serum and producing
effects resembling those represented in Fig. 57, are
readily caused by the blood serum of immunised
animals, and the spirilla undergo rapid degeneration
SPIRILLUM CHOLERA 83
(PfehTer's reaction) when injected into the peritoneal
cavity of the protected animal.
No true antitoxic action has been shown to be
possessed by the protective serum.
SPIRILLUM FINKLERI
SPIRILLUM AVICIDUM (METCHNI-
KOVII)
SPIRILLUM TYROGENUM (DENEKE)
THE three varieties of Spirilla which are illus-
trated in the following photographs are chiefly-
interesting in connection with the difficulty expe-
rienced in establishing the specific character of the
Cholera Spirillum (Koch).
The Spirillum Finkleri was isolated by Finkler of
Bonn. It presents morphological characters ex-
tremely like those of the true Cholera Spirillum,
but is usually shorter and thicker, and less readily
gives rise to spirilla forms, though it is a true spiril-
lum. It is an extremely variable organism forming
coccoid, spindle and other forms, and has in con-
sequence been called Vibrio Proteus (Buchner).
(Fig. 83).
Its culture in gelatine resembles that of Koch's
.ADITAieA A>;:-iJo .M'^ ,
3 ij. ij-,
x .<> "ifJnoo noil09JO7 c J
FIG. 82. SP. CHOLERA ASIATICA.
Gelatine Plate Culture, Colony 72 hours' growth at 21 C.
12 mm. apochromat, Projection ocular 6. x 125.
FIG. 83. SP. FINKLERI.
Cover Glass Preparation, Agar Culture, Gentian-Viole t
apochromat, Projection ocular 6. x 1000.
FIG. 82.
5f*- >
V**
MV
v.
FIG. 83.
FIG. 84.
FIG. 85.
* 'o^V^ ' '"x ' '
FIG. 86.
FlG. 84. SP. FlNKLERI.
Gelatine Stab Culture, 24 hours' growth at 21 C. i : i.
FIG. 85. SP. FINKLERI.
Gelatine Stab Culture, 48 hours' growth at 21 C. i : i.
FIG. 86. SP. AVICIDUM (METCHNIKOVII).
Cover Glass Preparation, Agar Culture, Watery Fuchsine,
V apochromat, Projection ocular 6. x 1000.
.000 j x ,r .''-
FIG. 87.
FIG, 88.
FlG - 8 9 FIG. 90.
F IG . 87. SP. AVICIDUM (METCHNIKOVII).
Cover Glass Preparation, Agar Culture, Flagella, Nicolle-
Morax-Loffler, T V apochromat, Projection ocular 6. x 1000.
FIG. 88. SP. AVICIDUM (METCHNIKOVII).
Gelatine Stab Culture, 48 hours' growth at 21 C. i : i,
FIG. 89. SP. AVICIDUM (METCHNIKOVII).
Gelatine Stab Culture, 96 hours' growth at 21 C. i : i.
FIG. 90. SP. TYROGENUM (DENEKE).
Gelatine Stab Culture, 48 hours' growth at 21 C. i : i.
i* .r
.0001 x
SPIRILLUM AVICIDUM 85
organism, but the liquefaction proceeds so much
more rapidly that by the time the characteristic
growth of Sp. Cholerse is reached, the Sp. Finkleri
has produced a long finger-shaped track in the
gelatine, in which all trace of the original funnel
has been lost. Comparison of the four photographs
and of the periods of growth of the cultures they
represent shows at once the nature of the differen-
tiation (Figs. 84 and 85).
The pathogenicity of this microbe is much less
than that of cholera.
The Spirillum Avicidum, or Sp. Metchnikovii, is an
organism discovered by Gamaleia in the intestines
of domestic fowls, and presents a very striking
resemblance, both morphologically and culturally, to
the organism of Koch. In preparations made from
the infected animal or from pure cultures no con-
stant differences between the two organisms can be
detected, though the Sp. Metchnikovii is perhaps
generally thicker and shorter. The arrangement
and number of flagella is also identical (Fig. 87).
The two illustrations of the growth in gelatine
might very well pass for growths of the Cholera
Spirillum, though as a general rule the growth of
the Sp. Avicidum is somewhat the more rapid
(Figs. 88 and 89).
86 SPIRILLUM TYROGENUM
A further resemblance obtains between this
spirillum and that of Koch in that each gives the
cholera red reaction when their cultures in Pep tone -
salt are treated with a few drops of strong sulphuric
acid. In the lower animals this organism is more
virulent than the Sp. Cholerae, and subcutaneous
injection in the pigeon kills the animal in 24 hours ;
the spirillum is found in considerable numbers
in the blood and internal organs.
The Spirillum of Deneke was isolated from decay-
ing cheese. In culture (Fig. 85) it is very similar
to the cholera spirillum, but is morphologically less
like it than the two preceding organisms, and is
nearly without pathogenic action.
FIG. 91.
FIG. 92.
FIG. 91. BACILLUS PESTIS BUBONIC^.
Cover Glass Preparation, from Liver of Rat, Carbol-
Fuchsine, T V apochromat, Projection ocular 6. x 1000.
FIG. 92. B. PESTIS BUBONIC^;.
Cover Glass Preparation, Agar Culture, 48 hours' growth at
37 C., Gentian-Violet, T V apochromat, Projection ocular 6.
x 1000.
' '! 'I
) Ml V; TV/!.] ,.,1
.coca x */> -rfifffaci f?oi
,cooi x
BACILLUS PESTIS BUBONIC^
THE Bacillus Pestis Bubonicae was discovered by
Kitasato in 1894, and independently by Yersin a
little later. It is found in almost pure culture in
the buboes characteristic of the disease, and it is
also widely spread, though not in large numbers, in
the internal organs, and is found in the blood, lymph,
urine, and faeces of those affected.
The bacillus is undoubtedly the cause of the
disease, though the various methods by which the
organism gains access to the body are not fully
known ; subcutaneous inoculation (wounds, &c.) is
certainly one of them. Animals are affected by the
disease, and many observers (Koch, &c.) think that
it is primarily a disease of the rat.
Preparations made with material from the bubo,
or from the spleen or liver of an infected rat
(Fig. 91) show the bacillus in large numbers. It is
short, thick, round-ended, and, owing to its tendency
to stain more deeply at the extremities than in the
88 BACILLUS PESTIS BUBONIC^E
centre, often presents the appearance of a diplo-
coccus or figure-of-eight bacillus. Some examples
of this polar staining can be seen in the figure. It
is lion- motile, occurs occasionally in short chains, is
frequently capsulated, and does not stain by Gram's
method.
It can be cultivated on glycerine-agar and in
bouillon at 37 C. moderately well, but grows slowly
and without liquefaction on gelatine at 21 C. In
this medium typical thread-like colonies resembling
Proteus Vulgaris are produced (Klein).
Preparation Fig. 92 is made from a young agar
culture, and shows an organism resembling that
from the tissues. In bouillon it assumes an almost
streptococcus form, and all cultures are very prone
to produce involution forms.
Animals can be protected against inoculations of
the bacillus, and the blood serum of these immunised
animals is both protective and therapeutic. The
serum also appears to possess agglutinating proper-
ties similar to those described under B. Typhosus.
Protection can be afforded by the inoculation of
sterilised cultures, and, in man, vaccination by this
method has been very largely employed to secure
protection.
FIG. 93.
- \ -
\
FIG. 94.
FIG. 93. SP. OBERMEIERI.
Cover Glass Preparation from Blood of Patient, Carbol-
Fuchsine, ^ apochromat, Projection ocular 6. x 1000.
FIG. 94. BACILLUS TETANI.
Cover Glass Preparation, Bouillon Culture, showing Spore
Formation, Carbol-Fuchsine, T ^ apochromat, Projection
ocular 6. x 1000.
> JnOMF'I )0 boOn BIO 1 83fi
oc i v dirAtw fwil'vi sijuqi; ,/ f t 3ftiedDJfH
.L/.AI:! I > j.i. 11 >Ad~4y .ni
^in/oil.-? - 3-inHiJ J aolIinoH ,noiiBinrpTl a
M-lothJs:)
.0 ir.d
SPIRILLUM OBERMEIERI
(RELAPSING FEVER)
IN 1873 Obermeier discovered in the blood of those
suffering from Relapsing Fever an actively motile,
long, and very fine spirillum (Fig. 93). The organ-
ism is flexible, has finely-pointed extremities, and
measures some 16 to 40 /i in length. It is stained
with some difficulty by fuchsine and alkaline methy-
lene blue. It is found only in the blood and only
during the febrile attacks, and increases in numbers
up to the crisis. It has not yet been cultivated.
Koch and Carter have succeeded in producing a
febrile disease in monkeys by the inoculation of
blood containing the spirillum, and the blood of
these inoculated animals also contains the spirillum.
Relapses are, however, not produced in these ani-
mals, which recover after a single attack of fever.
They are not rendered immune by the inoculation.
BACILLUS TETANI
DISCOVERED in 1884 by Nicolaier in the pus from
abscesses caused by the inoculation of garden earth,
and isolated in pure culture by Kitasato in 1889,
the specific cause of tetanus proved to be a short,
fine, slowly moving anaerobe, growing into long
filaments and chains of shorter elements, and, under
suitable conditions, producing spores. The rods
stain by Gram's method, and are usually from 2-4 /a
in length by about *o /n wide.
If the pus from a tetanus-producing wound be
purified by heating to 80 C. a temperature not
destructive to tetanus spores and then cultivated
in glucose bouillon under anaerobic conditions at a
temperature of 37 C., a pure growth of the bacillus
may be obtained. The medium becomes moderately
turbid at first, but shows a strong tendency to clear
and form a deposit at the bottom of the tube. If
such deposit be examined after about forty-eight
hours' growth, it will be found to consist largely of
FIG. 96.
FIG. 95. B. TETANI.
Anaerobic Culture, Glucose-Gelatine, i : i.
FIG. 96. B. CEoEMATis MALIGNI.
Cover Glass Preparation from (Edematous Fluid, Methylene
Blue, T x o apochromat, Projection ocular 6. x 1000.
J .H
BACILLUS TETANI 91
the slowly motile vegetative cells described above,
with, however, a few spore-bearing bacilli. Should
the culture be older, a cover-glass preparation will
show the appearance represented an Fig. 94, in
which the great majority of the bacilli possess a
spherical, strictly terminal spore of considerably
greater diameter than the bacillus itself, giving rise
to the " drum-stick " appearance so characteristic of
this organism. The length of these spore-bearing
bacilli is very variable, and the protoplasm, by its
vacuolation and irregularity of staining, shows signs
of degeneration. At the left-hand side is seen a
non-spore-bearing filamentous form.
The bacillus grows between the temperatures
14 C. and 43 C. Its optimum is about 37 C.
Spore formation begins at 20 C. and ceases at 42 C.,
and is rapid at about 37 C. Should such a culture be
inoculated by means of a pipette into the depths of
a glucose gelatine tube, whose surface is then melted
so as to close the track of the inoculation, and whose
mouth is sealed or covered with india-rubber, then,
if kept at 21 c C., a growth such as is represented in
Fig. 95 will be obtained. The growth consists of a
series of fine filaments radiating from the lower part
of the inoculation track, penetrating the gelatine,
and finally, but slowly, causing liquefaction, without,
92 BACILLUS TETANI
however, giving rise to any evolution of gas. The
growth then forms a thick mass at the bottom of
the tube. The same radiating filaments are seen in
isolated colonies.
The pure culture, when inoculated, gives rise to
tetanus. There is practically no local lesion, and
the bacilli disappear rapidly from the seat of inocu-
lation, and are not found in the blood or internal
organs. The tetanus results from the toxins pro-
duced by the organism, and, while disease may be
produced by the poison alone, an inoculation of the
toxin-free microbe is inert and unable to produce a
pathogenic effect unless assisted by chemical, trau-
matic, or microbic aids.
A condition of immunity may be produced in
susceptible animals which is valid against either the
living organism or its toxins. The blood serum of
these immunised animals is capable of neutralising
in " vitro " the toxin of the culture. It is also
capable of preventing the pathogenic effects of
inoculations of the bacillus or its toxins when the
serum is injected before, at the same time, or soon
after the inoculation, and it may act therapeutically
after symptoms of tetanus have already shown them-
selves. The dose of serum required for therapeutic
purposes is enormously greater than that required
BACILLUS TETANI 9S
for prevention. Our knowledge of tetanus, the
possibility of immunisation, the antitoxic and pre-
ventive action of the blood serum, is due to Kitasato
and Behring, Roux, Vincent and Vaillard, Tizzoni,
and others.
BACILLUS (EDEMATIS MALIGNI
CULTIVATED soil contains not only the B. Tetani but
also the B. GEdematis Maligni (Koch) or Vibrion
.Septique (Pasteur). Earth containing this organism
when inoculated subcutaneously gives rise to a
rapidly fatal disease malignant oedema character-
ised by the production of extensive subcutaneous
oedema, starting from the point of inoculation and
emphysema due to copious production of gas in the
tissues. The same organism appears to be the cause
of the occasional complication of wounds known as
" acute emphysematous gangrene," " gangrene foud-
royante," &c.
In the reddish fluid which fills the oedematous
tissues and in the contents of the bullae which form
on the affected parts are found rather large, jointed,
motile bacilli closely resembling in size and shape the
B. Anthracis but distinguished from this organism
by their motility, the less angular outline of the
cells, and by the occurrence of chains of bacilli
BACILLUS (EDEMATIS MALIGNI 95
decidedly longer than those usually present in
Splenic Fever (Fig. 96). The bacilli are from 3 /u
to 6 ju in length, by '8 p to 1 p in breadth. The
subcutaneous fluid, as may be seen from the prepara-
tion, is remarkably rich in bacilli, which, however,
are not found in the blood in any considerable
numbers immediately on the death of the animal,
but increase rapidly later. In pleural and peritoneal
exudations the bacilli are found. From such oedema-
tous fluids cultures may be obtained in any of the
ordinary culture media (with the addition of glucose)
provided the material be cultivated anserobically, as
the organism is a strict anaerobe. In bouillon at
37 C. rapid growth takes place with an evolution
of gas and the production of a general turbidity of
the medium, which subsequently clears and leaves a
dense, white, flocculent mass at the bottom of the
tube. From a culture on agar, preparation Fig. 97
is made, and is seen to consist of a mixture of bacilli
in the vegetative form and spore-bearing bacilli.
The spores are frequently in the centre of the cells,
which become somewhat fusiform, but they are also
often more or less terminal, and in some cases the
organism closely resembles B. Tetani in appearance.
It will be seen, however, that the spore is more oval
and that there is always a prolongation of the
96 BACILLUS (EDEMATIS MALIGNI
protoplasm of the cell extending beyond the
spore.
Contrary to what occurs in anthrax the cultures
as a rule contain threads and chains of bacilli which
are shorter than those found in the fluids of the
inoculated animal.
The organism is not stained by Gram's method.
The growth of the bacillus is associated with the
production of gas (Hydrogen and Carbonic Acid),
and such a solid medium as glucose- agar is split up
by gas-bubbles as is shown in photograph Fig. 98.
The gas production is often so free that the
medium is quite broken up and portions of it driven
up the tube.
A culture in glucose gelatine made in exactly the
same way as the similar culture of tetanus (Fig. 95)
is depicted in Fig. 99. A turbid sac of liquefied
gelatine is formed along the line of inoculation, but
stops short some little distance below the free surface
of the gelatine.
The liquefaction proceeds rapidly and gas-bubbles
make their appearance.
The organism is motile, and owes its motility to a
large number (8-12) of peripherally arranged long
flagella, which are very well seen in the figure
(Fig. 100).
.a ~.^j k f>f-j
>JiKlBq:j'I f I <:e-.J
FIG. 97. B. (EDEMATIS MALIGNI.
Cover Glass Preparation, Agar Culture, showing Spore
Formation, Carbol-Fuchsine, -^ apochromat, Projection ocu-
lar 6. x 1000.
FIG. 98. B. (EDEMATIS MALIGNI.
Stab Anaerobic Culture, Glucose- Agar. i : i.
FIG. 99. B. (EDEMATIS MALIGNI.
Anaerobic Culture, Glucose-Gelatine, i : i.
F]G. 97.
FIG.
FIG. 99.
BACILLUS (EDEMATIS MALIGNI 97
Inoculation of the pure culture produces rapid
death of the animal, often within twenty-four hours.
The emphysema is not so marked with the culture
as after inoculation with infected soil.
It has been possible to produce immunity by the
injection of filtered cultures (Roux and Chamber-
land), especially when the injection is made into the
blood stream.
BACILLUS ANTHRACIS
SYMPTOMATIC!
THIS anaerobic organism is the cause of " quarter
evil" in cattle. The disease was at first confused
with true anthrax, but the points of difference in
the two affections were pointed out and the specific
bacillus discovered by Bellinger and Feser in 1878.
The bacillus is a motile, fairly large organism
measuring about 4 p by 1 p. It occurs in the tissues
as single cells and as short chains (Fig. 101). It is
a spore-bearing organism, but spore formation does
not occur until after the death of the animal. The
spores are generally central, but not unfrequently
terminal, and they cause a modification in the shape
of the vegetative cell similar to that which occurs
in the two preceding organisms.
In culture it produces gas, and liquefies gelatine.
Animals can be immunised against the action of
the bacillus and vaccination of cattle is carried on
abroad on a large scale.
*wl
,'j-j/-.- .eiO -ju
.0001 x .(> 'irJnoo noij ';!jo(]>> -j. 1 , ,
.H .1Q3 .^j'd
*l ,)KtticmioGC{>; -J-f
FIG. 100. B. CEDEMATIS MALIGNI.
Cover Glass Preparation, Agar Culture, Flagella, Van
Ermengem, -^ apochromat, Projection ocular 6. x 1000.
FIG. 101. B. ANTHRACIS SYMPTOMATICI.
Cover Glass Preparation, Pleural Fluid, Carbol-Fuchsine,
V apochromat, Projection ocular 6. x 1000.
I ,
*
t '*.'
FIG. loo.
X
/
v\e<
1 .\v I '
FIG. 101.
ACTINOMYCOSIS
ACTINOMY COSTS is a disease which attacks both men
and cattle, producing tumours of a chronic inflam-
matory character, terminating in suppuration, and
producing discharging abscesses of an extremely
intractable character.
In the pus from these abscesses may be observed
small granules of a yellowish colour, looking like
portions of inspissated pus. These vary in size,
attaining that of a pin's head ; and when crushed
beneath a cover glass are often felt to be slightly
gritty. The colour varies from the usual yellow,
and is sometimes greenish, brownish, or black.
They were noticed by Lebert, and described by
Robin in 1871. These granules are composed of
the organism which is the cause of the disease.
Their appearance under the microscope differs very
widely in different cases, and this is often, but not
always, dependent upon the source from which the
pus is derived, whether Human or Bovine Actino-
100 ACTINOMYCOSIS
mycosis. Fig. 102 represents what is observed
when a granule from human actinomycotic pus is
crushed out in a little liq. potassse, washed in
ether and alcohol, and stained by Gram's method.
The nodule is seen to consist of a spherical mass of
interlaced mycelial filaments, consisting of a central
protoplasmic strand surrounded by a membrane.
This mycelium is the essential part of the micro-
organism, and is alone found in the cultures
(Fig. 103). The filaments grow in a radiate manner,
and are long, branched, often corkscrewed, and
frequently present a swelling at their extremities.
Such forms can be seen in the photographs. The
mycelium stains well by Gram's method, shows 110-
trace of division, and its protoplasm is segregated
and granular. Very frequently small granules
(? spores) are found in the centres of the masses
which are derived by segmentation from the ends of
the filaments.
Inoculated on the surface of blood serum or
glycerine-agar, growth takes place at 37 C. after
some days, and the inoculated granules gradually
increase in size, forming a dirty white, wrinkled,
raised growth. After some time, which is very vari-
able, the growth, especially where it is most elevated
and driest, becomes covered with a sulphur yellow
i imijiixt;
BH'IYMOHITOA .OI .Ol
oiJooioi'I j/irnoixiy
FlG. 102. ACTINOMYCES HOMINIS.
Cover Glass Preparation of Pus from Actinomycotic
Abscess, Gram, T ^ apochromat, Projection ocular 6. x 1000.
FIG. 103. ACTINOMYCES Bovis.
Cover Glass Preparation, Bouillon Culture, Gram, ^ apo-
chromat, Projection ocular 6. x 1000.
FIG. 102.
FIG. 103.
FIG. 104.
FIG. 105.
FIG. 104, ACTINOMYCES Bovis.
Culture on Glucose- Agar. i : i.
FIG. 105. ACTINOMYCES Bovis.
Section of Tongue, Gram, apochromat, Projection ocular 6.
375-
-
roo noiJodioi c l jBfljoidooq f, .m/riO.oij^uoT to
ACTINOMYCOSIS 101
powdery deposit; and the culture assumes the
appearance, except as to colour, which is exhibited
by the various trichophytons. The culture material
generally darkens and becomes quite brown. Such
a culture on agar is shown (Fig. 104).
In granules derived from bovine actiriomycosis,
and in some cases of the human disease, the micro-
scopic appearance differs much from that described
above. The mycelial filaments are conspicuous by
their absence, or are so reduced in length and im-
portance as to be hardly noticed, and instead there
appears a rosette of Indian -club shaped rays, which
are strongly stained by Gram's method.
Fig. 105, which is photographed from a section
of the tongue, shows this form of the organism.
These "clubs" are formed by a swelling whether
degenerative or not is doubtful of the sheaths
covering the swollen ends of the protoplasmic fila-
ments. The great varieties in appearance presented
by the organism in different cases is due to the pro-
portion which obtains between the ordinary myce-
lium and these modified club-shaped filaments, a
difference further accentuated by the fact that in
proportion as the mycelium increases, so does the
staining by Gram's method of such clubs as are
present diminish. There exists, therefore, at one end
102 ACTINOMYCOSIS
of the scale the typical bovine organism, a sphere
of radiate, closely-set, clubbed filaments, strongly
stained by Gram's method, and showing in the centre
of the mass little or no trace of mycelium, and at
the other a radiating mass of long, branching fila-
ments, staining by Gram's method, and showing
little or no trace of clubs which remain unstained.
All stages intermediate between these may be found
in different cases of human actinomycosis, and even
in different abscesses from the same case.
Fig. 106 shows a section of pus from a case of
human actinomycosis, in which the organism is
intermediate in character. The dark trilobed mass
is a strongly stained network of filaments lying-
imbedded in pus cells. At the periphery individual
filaments may be distinguished, and also especially
in the right lobe many clubs from which the stain
has intentionally been only partially removed.
The organism has been successfully inoculated.
It usually spreads in the body by direct growth
through the tissues, advancing from some centre
where it has become established. It may also
be distributed by the lymph and blood streams ;
the former is the more common. The symptoms to
which it gives rise are very varied, and depend on
the parts of the body affected.
itfiw b
JJHAJAM
FIG. 106. ACTINOMYCES HOMINIS.
Section of Hardened Pus from Actinomycotic Abscess,
Gram and Eosin, i apochromat, Projection ocular 6. x 550.
FIG. 107. PLASMODIUM MALARI.E (TERTIAN).
Fully-developed Pigmented form, stained with Borax-
Methylene-Blue. x 800.
FIG. 108. PLASMODIUM MALARIA (TERTIAN).
Sporulating body, stained with Borax- Methylene- Blue,
x 800.
' t '** v fj
'**.
FIG. 107.
FIG. 108.
PLASMODIUM MALARIA
THE parasite of malaria was discovered by Laveran
in 1880, and his discovery has been confirmed by all
subsequent observations. The Plasmodium Malarias
is a parasite whose habitat is the red blood corpuscle.
It appears to be a protozoon, is placed by most
authorities among the Sporozoa, and is closely allied
to the Coccidia. It forms one of a group of similar
but distinct organisms found in other vertebrata,
and there are undoubted varieties, if not distinct
species, of the human plasmodia, each associated
with different clinical forms of the disease. The
physiology and life cycle of the plasmodium regu-
lates the phenomena of the disease, and the phases
of the parasite bear a definite relation to the phases
of the fever. The plasmodia have life cycles of 24,
48, and 72 hours, and give rise to quotidian, tertian,
and quartan fevers respectively. In their earliest
stages the parasites are found as small, pale, ill-
defined, amoeboid discs of protoplasm within the red
104 PLASMODIUM MALARIA
blood corpuscle. These bodies increase in size, and
in them appear granules of black or reddish-black
pigment melanin derived from the haemoglobin
of the infected cell. These pigment granules, origi-
nally scattered and peripherally arranged, gradually
collect into groups or radiating lines, and finally con-
centrate into a more or less centrally arranged mass.
Around this the protoplasm of the parasite divides
into regularly arranged segments, which become cir-
cular and appear as well-defined spherules possessing
a vesicular nucleus and a nucleolus. These are the
spores (Fig. 108), and on their maturation the
red corpuscle breaks down, and the spores are set
free ; the melanin, which is not included in the
spores, also escapes. A proportion of these free
spores attach themselves to and finally enter other
red cells, and the cycle begins anew. The early
amoeboid movements become less as the parasite
matures, and cease before sporulation. After the
spore enters the blood cell, as may be seen in
stained specimens, the badly-staining nucleus in-
creases in bulk together with the protoplasm, and
the nucleolus comes to lie eccentrically. This eccen-
tricity of the nucleolus, and the relative size and
staining properties of the nucleus and protoplasm,
give the parasite a " signet ring " (Manson) appear-
FIG. 109.
FIG. no.
^
FIG. in.
FIG. 109. -PLASMODIUM MALARIA (TERTIAN).
" Signet-ring " form, stained with Borax- Methylene- Blue.
X 1000.
FIG. no. PLASMODIUM MALARIA (MALIGNANT TERTIAN).
"Crescent" body, stained with Borax-Methylene-Blue.
x 1000.
FIG. in. PLASMODIUM MALARIA (MALIGNANT TERTIAN).
Flagellated body, stained with Carbol-Fuchsine. x 1000.
(From a preparation kindly lent by Dr. Manson.)
Myi
hamate ,rmol '
.0001 X
18AJ4 .Oil -Ol'Hf
.ooa \ x
:;) rfiiw
ifial '/Ihtibi aor>Jii>f|3iq inoil)
PLASMODIUM MALARLE 105
ance in the corpuscle (Fig. 109). The nucleolus and
nucleus gradually become less distinct, and are un-
distinguishable at the time of sporulation.
The above description applies to the intra-corporeal
phase of the parasite, and these forms are destroyed
or disappear on the administration of quinine. In
the blood of patients suffering from the so-called
malignant fevers, another form the crescent body
is also found (Fig. 110). These are very regular,
intra-corpuscular, crescent-shaped organisms, con-
taining pigment which is usually, but not invariably,
placed centrally ; a very delicate convex line repre-
senting the red corpuscle passes from horn to horn
of the crescent on its concave side. The crescent
is thought by Mannaberg to be a syzigium formed
by the conjugation of two plasmodia in a doubly
infected corpuscle.
In blood which has been shed for some time
10 to 30 minutes and especially in blood which has
been exposed to air and slight moisture, "flagellated
bodies" are found (Fig. 111). These flagellated bodies
are free, pigmented, protoplasmic masses resembling
fully developed parasites from whose periphery
start actively motile filaments (flagella) which break
away, become free, and rapidly move about among
the blood cells. The remains of the body from
106 PLASMODIUM MALARIA
which the flagella are derived appear to undergo
degeneration or absorption.
These flagellated bodies are derived either from
the crescent bodies, or, in those varieties of the
parasite which do not form crescents, from extra-
corpuscular plasmodia resembling the fully developed
form just prior to sporulation. The crescent becomes
a sphere with central pigment, this sphere becomes
agitated with movements of increasing violence,
and, finally, the flagella are shot out from the
periphery. Similar movements affect the flagella-
producing body which is not derived from the
crescent.
These flagella are regarded by Man son as the first
phase of extra- corporeal life. It has been shown by
Ross that the transformation and ex- flagellation
take place most fully in the stomach of certain
varieties of mosquito. On the analogy of observa-
tions by MacCullum on an allied parasite in crows,
these flagella or flagellated spores impregnate a
non-flagellated body, and the resulting organism is
probably found as a pigmented cell in the stomach
wall of the mosquito. The mosquito thus plays
the part of secondary host, and man is infected by
water or dust which has been itself infected by
mosquitos. The varieties of malarial parasites at
PLASMODIUM MALARIA 107
present recognised are, .according to Manson, from
whom the following table is borrowed :
( Quartan )
Benign ] , Y do not form crescents.
I Tertian )
Quotidian, pigmented \
Malignant -j Quotidian, unpigmented [ form crescents.
Tertian j
The Quartan parasite has much and relatively
coarse-grained pigment. The spores are eight to ten
in number, and arranged in " daisy " fashion, and
there is no hypertrophy of the infected red cell.
The Benign Tertian (Fig. 107) is actively amoeboid
in its early stages, and causes marked hypertrophy
and decolourisation of the infected corpuscle. The
sporulating body is a somewhat irregular cluster of
15-20 spores, arranged round a mass of dark
pigment.
The Malignant parasites are very much smaller
than the. Benign, and tend to assume a ringed form.
Multiple infection of the red cell is common. The
parasites are very numerous, but tend to pass out
of the peripheral circulation into the capillaries
of the internal organs and bone marrow, and the
sporulating stage is rarely present in the peripheral
blood. Crescents are characteristic of all the forms.
The pigmented and non-pigmented forms are
108 PLASMODIUM MALARIJE
small and actively amoeboid. The sporulating body
consists of six to eight very small spores.
The Malignant resembles the Benign Tertian, but
is smaller, does not cause hypertrophy of the red
cells, and has fewer (10-12) spores, arranged in
irregular heaps and rarely found in the peripheral
blood.
INDEX
ACTINOMYCOSIS, 99
agar culture of, 101
"clubs "of, ioi
cultures of, 100
inoculation of, 102
"spores" (?) of, 100
Agar-glucose-glycerine medium for B. Tuberculosis, 36
Amphitricha, 20
Animals, how infected with anthrax, 29
Anthrax bacillus, 24
Aperture of " Iris " diaphragm in photomicrography, 5
Arthrospores, 20
Ascococci, 15
Avian tuberculosis, 38
B
BACILLI, n, 16
Pasteur's figure-of-eight, 16
Bacillus, The Comma, 18
Bacillus Anthracis, 24
agar culture, 28
animals, how infected, 29
bouillon culture of, 27
death point of, 27
of spore, 27
110 INDEX
Bacillus Anthracis, gelatine plate culture of, 28
gelatine stab culture of, 28
hanging drop culture, 26
impression preparation, 28
kidney, section of glomerulus, 31
liver, section of, 31
lung, section of, 30
malignant pustule, 30
section through, 30
" Medusa-head " colonies of, 29
microscopic appearance of blood of infected animal, 29
optimum temperature of, 27
shape of, 25
size of, 24
spores of, 26, 27
spleen, section of, 31
Bacillus Anthracis Symptomatici, 98
gas production of, 98
immunisation against, 98
size and motility of, 98
spores of, 98
Bacillus Coli Com munis, 64
flagella of, 64
fermentation, properties of, 65
glucose-gelatine, action on, 65
indol, production of, 65
milk, action on, 65
size and shape of, 64
Bacillus Diphtherise, 71
agar culture of, 74
antitoxic serum, 76
colonies of, 73
effects of inoculation of, 75
gelatine culture of, 74
involution, forms of, 73
INDEX 111
Bacillus Diphtherias, metachromatism of, 73
morphology of, 75
optimum temperature of, 74
phagocytosis, 72
polar staining and banding of, 73
serum culture of, 74, 75
size and shape of, 72
Bacillus Leprce, 23, 41
Bordone Uffreduzzi's culture of, 42
inoculation, experiments with, 42
size and shape of, 41
Bacillus Mallei, 46
beading and polar staining of, 47
cultures of, 47
experiments with, on animals, 48
immunisation of animals against, 48
involution form, 47
mallein, 48
polymorphism of, 47
size and shape of, 46
Bacillus CEdematis Maligni, 94
agar culture of, 95
bouillon culture of, 95
effects of inoculation of, 97
gas production of, 96
immunisation against, 97
motility of, 96
shape and size of, 94, 95
Bacillus Pestis Bubonic*, 87
cultures of, 88
effects of inoculation of, 87, 88
shape of, 87
Bacillus Pneumoniae Friedlander, 69
gelatine-stab culture of, 70
Bacillus Smegmatis, 36, 40
INDEX
Bacillus Smeginatis staining, reaction of, 40
Bacillus Syphilidis (Lustgarten), 40
Bacillus Tuberculosis, 32
avium, 38
branching of, 42
" Coral Island," culture of, 37
feeding experiments of, 32
giant cells, 38
inoculation experiments, 32
Koch's method of cultivation of, 36
optimum temperature, 37
paths of infection of, 32
primary cultures of, 37
protoplasm of, 34
saprophytic life, evidence of, 38
secondary cultures of, 36
segregation of, protoplasm of, 34
size and shape of, 33
specific staining reaction of, 33
tuberculin, 33
Tuberculosis, urine in, 35
Bacillus Tetani, 90
how obtained from tetanic pus, 90
glucose bouillon, culture in, 91, 92
immunity discussed, 92
inoculation, effects of, 92
optimum temperature of, 91
spores of, 91
Bacillus Typhosus, 59
agglutination of, 63
colonies in organs, 59, 60
cultures of, 61
death point of, 61
effects of inoculation, 62, 63
flagella of, 62
INDEX 113
Bacillus Typhosus gelatine plate culture of, 60
gelatine culture of, 60
glucose gelatine, action on, 61
hanging drop culture of, 62
milk, action on, 61
optimum temperature of, 61
polar, staining of, 62
potato culture of, 61
size and shape of, 60
" spider cells," 62
4t Backed " plates, their use in photomicrography, 9
Blastomycetes, 10
Bubonic plague, bacillus of, 87
Budding of B. Leprse and B. Tuberculosis, 23
CELLS, lepra, 43
Centring condenser for photomicrography, 5
Cholera spirillum, 77
Classification of Schizophytes, 1 1
Clostridial spores, 2 1
Coccacse sub-groups, 1 2
Cocci, n, 12
Coli communis bacillus, 64
flagella of, 64
gelatine culture of, 64
size and shape of, 64
Colour screens for photomicrography, 3
Condensers used for photomicrography, 2
Contrast, obtaining in negatives, 3, 4, 7, 8
"Comma" Bacillus (Koch), 18, 81
" S " and E " shaped forms, 18
" Coral Island" culture of B. Tuberculosis, 37
114 INDEX
" Critical Light " in photomicrography, 5
Culture tubes, how photographed, 9
D
" DAVIS " diaphragm, 6
Developer and development of negatives, 8
Diplobacillus, 16
Diplococci, 13
Diplococcus Pneumonise Frankel, 66
agar culture of, 67, 68
size and shape of, 67, 68
E
EDWARDS'S isochromatic plates, 6
Endospores, 20
formation of, 2 1
Exposure in photomicrography, 6
Eye-pieces, projection, 2
FIGURE-OF-EIGHT bacilli (Pasteur), 16
Filaments, leptothrix, 1 7
streptothrix, 17
Fission, multiplication by, 20
Flagellated organisms, 19
Focussing in photomicrography, 4
Frankel's pneumococcus, 66
agar culture of, 67, 68
size and shape of, 67
Friedlander's pneumobacillus, 69
gelatine stab culture of, 70
Fungi and fission fungi, 10
INDEX 115
G
GIANT cell in tubercular tissue, 38
Glanders, bacillus of, 46
beading and polar staining of, 47
cultures of, 47
experiments with, on animals, 48
immunisation of animals against, 48
size and shape of, 46
Glycerine-glucose-agar medium for cultivation of B. Tuber-
culosis, 36
Gonococcus (Micrococcus Gonorrhcese), 57
cultivation of, 58
size and shape of, 58
Ground glass for focussing in photomicrography, 4
HAND magnifier used in photomicrography, 4
Hyphomycetes, 10
IMPRESSION preparations of organisms, 22, 23
preparation of colony of B. Anthracis, 28
Infection paths of B. Tuberculosis, 32
Inoculation of B. Leprse, 42
Inoculation experiments with B. Typhosus, 62, 63
with B. Tuberculosis, 32
Inoculation of Staphylococcus Pyogenes Aureus, 55
of Streptococcus Pyogenes, 52, 53
Introduction, photographic, i
" Iris " diaphragm, aperture of, in photomicrography, 5
116 INDEX
KIDNEY, B. Anthracis in section of glomerulus, 31
Koch's Tuberculin, 33
Koch's method of cultivation of B. Tuberculosis, 36
LENSES used in photomicrography, i
Leprae Bacillus, 23, 41
" Lepra cells," 43
Leptothrix filaments, 1 7
Light "critical," 5
filters, 3
Limelight for photomicrography, 2
Liver, section of anthrax in, 30
Loffler's Bacillus, 7 1
Lophotricha, 20
Lung, section of anthrax in, 30
M
MALIGNANT pustule, section through, 30
Mallei Bacillus, 46
Mallein, 48
" Medusa- Head " colonies of B. Anthracis, 29
Merismopedia, 14
Methods of multiplication of Schizophytes, 12, 20
Micrococcus Gonorrhoeas, 57
cultivation of, 58
size and shape of, 57
Microscope and objectives used in photomicrography, i, 2
Monotricha, 19
Morphological characters of Schizophytes, 22
INDEX 117
Motile organisms, 19
Multiplication by fission, 20
N
NEGATIVES, density of background discussed, 7
Nelson's quasi-achromatic condenser, 5
Nocard and Roux glycerine-glucose-agar medium for B.
Tuberculosis, 36
OBJECTIVES and microscope used, i, 2
Optimum temperature of B. Anthracis, 27
B. Diphtherise, 74
Streptococcus Pyogenes, 51
B. Tetani, 91
B. Tuberculosis, 37
B. Typhosus, 61
PASTEUR, Figure-of-eight Bacilli, 16
Peritricha, 20
Pfeiffer's reaction Spirillum Cholera, 83
Photographic Introduction, i
Photography of culture tubes, 9
Plates, Edwards's isochromatic, 6
Plates, " backed," use of in photomicrography, 9
Plasmodium Malarise, 103
benign Tertian, 107
" crescent " bodies, 105
flagellated bodies, 105
life cycles of, 103
malignant parasite, 107
118 INDEX
Plasmodium Malarise, pigmented forms, 1 04
" signet" ring form, 104
spores of, 104
varieties of (Manson), 107
Projection eyepieces, 2
Protoplasm of B. Tuberculosis, 34
segregation of, 34
Pustule, malignant, section through, 30
Pyogenic organisms, 49
Q
QUARTAN parasite, malaria, 107
E
RELAPSING fever, Spirillum of, 89
Roux and Nocard, glycerine-glucose-agar medium for B.
Tuberculosis, 36
s
SARCINA, 15
ventriculi, 16
Schizomycetes, 10
Schizophytes, classification of, 10, n
morphological characters of, 22
Secondary condenser in photomicrography, 5
cultures of B. Tuberculosis, 36
Segregation of protoplasm of B. Tuberculosis, 34
Smegma Bacillus, 36, 40
staining, reaction of, 40
Specific stain of B. Tuberculosis, 33
Spirilla, n, 17
varieties of, 18
INDEX 119
Spirillum avicidum (Metchnikovii), 85
Spirillum cholera asiatica, 7 7
agar culture of, 79
agglutination by serum, 82
appearance of colonies, 81
bouillon culture, 78
flakes in rice stools, 77, 78
flagella of, 79
gelatine stab culture of, 80
plate culture of, 81
" school of fish " appearance, 78
size and shape of, 77
Spirillum Deneke (Tyrogenum), 86
Spirillum Finkleri, 84
gelatine culture, 84
Spirillum Obermeieri, 89
size and shape of, 89
Spirochsetse, 18
Spleen, B. anthracis in section of, 31
Spore formation of B. Anthrisis, 27
Spores, clostridial, 21
Spreading inflammation, bacillus of, 50
Staphylococci, 12
Staphylococcus Pyogenes albus, 49, 54
Pyogenes aureus, 49, 54
agar culture of, 54, 55
effects of inoculation and injection, 55
hanging drop culture, 55
gelatine culture, 55
stab culture, 55
Streptococci, 13, 14
Streptothrix filaments, 1 7
Streptococcus Erisipelatosus, 5 1
.Streptococcus Pyogenes, 49, 50
agar culture of, 51
120 INDEX
Streptococcus Pyogenes, bouillon culture of, 52
effects of inoculation, 52, 53
gelatine culture, 51
optimum temperature of, 51
T
TUBERCULIN (Koch), 33
Tuberculosis Bacillus, 32
Tubes culture, photography of, 9
Typhosus Bacillus, 59
U
UFFREDUZZI, culture of B. Leprse by, 42
Urine, B. Tuberculosis in, 35
VIBRION Septique Pasteur, 94
Vibrios, 18
w
WIDAL'S reaction (B. Typhosus), 63
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