118 Report of the Department of Bacteriology of the 



Table X {concluded) . 



The above table shows that 45 groups of organisms were recog- 

 nized in 750 samples representing 15 cows. The frequent failure 

 to classify the organisms, particularly in the front quarters, was 

 largely due to the small numbers present and the consequent 

 uncertainty as to whether the colonies on the plates represented 

 real members of the udder flora. Occasionally the attempt at 

 classification was omitted because of the mixed character of the 

 growth and suspicion that the sample may have suffered from 

 some unknown contamination. A few of the vacancies are due 

 to the loss of type cultures before their study had been completed. 

 In a fair proportion of cases miscellaneous colonies appeared 

 upon the plates. They were not included in the classification 

 because, as already explained, every effort was directed toward 

 restricting the classified forms to members of the true udder 

 flora. 



