EXPERIMENT STATION BULLETINS. 



633 



to obtain a sample of milk than to obtain a sample of blood, provided 

 results are comparable, this method would be of great value. 



Melvin has stated that the agglutinating power of milk for Bad. 

 abortus is approximately half as strong as that of the blood serum. 



A comparison of the Bad. abortus antibody content of the blood with 

 that of the milk is shown in Table I. 



TABLE I.— COMPARING THE BACT. ABORTUS ANTIBODY CONTENT OF THE BLOOD 



WITH THAT OF THE MILK. 



*Milk from L. R. quarter. The milk from other quarters negative. 



In this table it is seen that there is apparently no constant relation 

 betw^een the Bad. abortus antibody content of the blood and of the 

 milk. In some instances the blood reacts while the milk is negative and 

 again in other instances the milk will react when the blood is negative. 

 The fact that there seems to be no connection between the antibodies in 

 the blood stream and those in the milk leads the writer to believe that 

 the Bad. abortus antibodies in the milk are not to be accounted for by 

 the usual statement that they come from the blood stream. Attempts 

 are made in future experiments to explain the presence of these anti- 

 bodies in the milk. 



In Table II it is shown that the Bad. abortus antibody content of 

 milk may vary from quarter to quarter, 



TABLE II.— SHOWING THAT THE BACT. ABORTUS ANTIBODY CONTENT OF MILK 

 MAY VARY FROM QUARTER TO QUARTER. 



