302 . Bulletin 178. 



Acknowledgment. 



The Dairy Division is indebted to Dr. James Law, director of 

 the New York State Veterinary College, and to Professor Y. A. 

 Moore, of the same college, for exceptional privileges in the 

 Department of Comparative Pathology and Bacteriology, where the 

 major portion of this investigation was conducted. In addition, the 

 writer is personally indebted to Dr. Moore for the fundamental 

 methods employed in the investigation and for his personal assist- 

 ance in several examinations. Instructor F. R. "Wright of the same 

 department has rendered aid in field work incident to the 

 investigation. 



From the Laboratory of 

 Dairy Bacteriology. 



