640 



STATE BOARD OF AGRICULTURE. 



TABLE X.— Concluded. 



(A) 5 c. c. of milk from each quarter inoculated into guinea pigs with negative results. 



(a) Colostrum. 



(b) L. R. Dry. 



(c) R. R. Dry. 



The writer is satisfied that these are instances of Bad. abortus infec- 

 tion though perhaps in a rather inactive stage. With a view toward 

 finding a means of selecting the cows having actively infected udders 

 and consequently giving milk containing enormous numbers of Bad. 

 ahortus, a comparative study was made of the cellular and antibody 

 content of the fore milk and the strippings. In Table XI will be found 

 such a study of milk capable of producing typical Bad. abortus lesions 

 in guinea pigs. 



