ISTew York Agricultural Experiment Station. 101 



The fact that the small number of samples containing over 

 1,000 per cc. were not evenly distributed over the herd but were 

 obtained from a relatively small number of the cows is shown by 

 Table VI. 



It will be seen that of these 15 cows only three gave samples 

 containing over 1,000 per cc. from the front right quarter, two 

 from the fiont left quarter, four from the back right and five 

 from the back left quarter. 



These rather low numbers are in contrast with many of the 

 earlier observations, particularly those of Hastings and Hoff- 

 mann. 13 These investigators were plainly working with two very 

 unusual animals, though none the less interesting and worthy of 

 study on this account. The high numbers frequently obtained by 

 other investigators were usually due to samples drawn early in the 

 milking process and influenced by the initial high numbers of 

 the fore milk. 



Another point clearly shown in Tables IV and V is the striking 

 difference in germ content between the front and the back quarters 

 of the udder. According to Table IV the average content of the 

 samples from the front quarter was 191 and 249 per cc, respec- 

 tively, while those from the back quarters gave averages of 625 

 and 635 per cc. That this is not an accidental relationship is 

 further indicated by the fact that in each of the three herds 

 studied the average germ content of the back quarters is from 

 two to four times that of the corresponding front quarters. 



This same relationship is brought out in Table V, where it is 

 shown that of the samples from the front quarters of the udder 

 only 6 and 8 per ct., respectively, had a germ content of over 

 1,000 per cc, while this number was exceeded in 16 and 17 per 

 ct., respectively, of the samples from the back quarters. The maxi- 

 mum germ content found in samples from the front quarters was 

 4,632 per cc, while over 16,000 per cc. were found in the back 

 quarters. 



A comparison of the germs found in the sets of samples taken 

 from a single cow on any given evening, in the case of the 11 



is See footnote 1. 



