120 LABORATORY BACTERIOLOGY 



EXERCISE LXIII 



THE QUALITATIVE EXAMINATION OF WATER (^Continued) 



178. Work for this Exercise. — Examine the cultures made 

 in Exercise LXIL, 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 centimetre. 



