89 



determine the different species, especially of pathogenic 

 bacteria, and their relative number in the specimen of water 

 furnished. 



Read carefully the methods for water analysis in the text- 

 books. 



EXERCISE IvIX. 



THE QUALITATIVE EXAMINATION OF WATER (continued). 



§159. General directions. Examine the cultures made 

 in Exercise L,VIII, and make such others (subcultures from 

 colonies, etc.) as may seem necessary to determine the genera 

 and species of bacteria present with the relative number of 

 each per cubic centimeter. 



EXERCISE I.X. 



EXAMINATION OF CERTAIN BACTERIA NOT STUDIED IN 

 THE LABORATORY. 



§160. Explanatory note. This exercise will be devoted 

 to a review of preparations of important bacteria not studied 

 in the laboratory but demonstrated at the time of their consid- 

 eration in the lectures. Unfortunately the number neces- 

 sarily omitted is large. In this review those species whose 

 morphology forms an important part in their identification 

 such as the bacillus of tetanus, malignant oedema, and vari- 

 ous spirilla will be considered. Certain of the pathogenic 

 protozoa will also be demonstrated. These will be studied 

 more thoroughly in the course in Pathology . 



§161. General directions. Examine and make drawings 

 of the bacteria in the preparations furnished. 



Complete and hand in all notes on laboratory work. 



Have all apparatus for individual use inspected by the in- 

 structor. 



