EXAMINATION OF TISSUES III 



EXERCISE XLIX 



THE EXAMINATION OF SECTIONS OF TISSUE 

 CONTAINING BACTERIA 



162. The preparation of tissues for sectioning and the study 

 of the tissue changes more properly belong to the course in 

 pathology. It is important, however, that one should be able 

 to distinguish bacteria in the lesions which they produce. 

 For this reason an exercise is devoted to the study of bacteria 

 in sections of tissues already stained and mounted. These 

 include the various pneumonias, tuberculosis, anthrax, hog 

 cholera, typhoid, septicaemia, etc. 



163. Work for this exercise. Examine the sections fur- 

 nished for bacteria and note especially their distribution in 

 the tissues. 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. 



Examine all cultures for identification in previous exercises. 



