142 Report of the Department of Bacteriology of the 



There was one three-teated cow in the herd (No. 507) which had 

 presumably lost her quarter (left front) because of some bacterial 

 infection. This cow gave a cell count of 640,000 per cubic centi- 

 meter and bacterial counts of 2 for the right front quarter, 2230 

 for the right hind quarter, and 1 for the left hind quarter. The cell 

 count is the lowest given for any cow having a bacterial infection 

 in any quarter greater than 500 per cubic centimeter, a number 

 which is likewise smaller than the average for the herd. The 

 bacteria present in the case of the right hind quarter apparently 

 belonged to a single species which gave the group number 

 M. 212.2222033. The culture produced small pin point colonies 

 on agar similar in all respects to the colonies produced under like 

 circumstances by the streptococcus isolated from Cow 242 but no 

 tendency to chain formation was noted so that it was classified as 

 a micrococcus. 



C. AVERAGE CELL CONTENT OF THE MILK OF NORMAL COWS. 



Table VI has been drawn up in order to summarize all our known 

 data giving the cell content of the milk of individual cows. All of 

 the 122 cows referred to were supposed by their owners to be giving 

 normal milk, although the list includes several animals that had 

 had udder troubles of one kind or another at earlier periods in their 



Table VI. — Summary of Data Showing Cell Content of Normal Milk 



Quoted from Breed and Stidger. See footnote 1. 



