IDENTIFYING BACTERIA 97 
EXERCISE XXXIX 
IDENTIFYING BACTERIA FROM ANIMAL TISSUES AND 
THE STUDY OF BACTERIA IN SECTIONS OF TISSUES 
148. Work for this exercise. Examine and describe all of 
the cultures made from the animal tissues. 
Examine the bouillon and agar cultures microscopically, both 
in the fresh condition and in stained cover-glass preparations. 
If the species cannot be determined from these cultures 
and examinations, make such other cultures from these as may 
be necessary to enable one to do so. 
After the species are identified, state in the notes the facts 
upon which the identification is made. 
149. Examine the sections furnished for bacteria and note 
especially their distribution in the tissues.1 Make drawings of 
a few of the bacteria from each preparation. 
Compare the bacteria in the sections with the cover-glass 
preparations which have been made from cultures of the same 
species, and note any differences in their appearance which 
may be detected. 
1 The preparation of tissues for sectioning and the study of the tissue 
changes more properly belong to the course in pathology. It is im- 
portant, however, that one should be able to distinguish bacteria in the 
lesions which they produce. For this reason a part of an exercise is 
devoted to the study of bacteria in sections of tissues already stained 
and mounted. These include tuberculosis, anthrax, typhoid, septi- 
cemia, the various pneumonias, etc. 
Pe 
il (WT hips 
aot 7 . 
ee L “ AACN A ere eee ake’ 
