Table I. 



Showing the age at vaccination and source of each tubercular 

 animal and the extent of its lesions. 



*This animal was the one killed as a demonstration at the meeting of the 

 Medical Milk Commissioners of California at the University Farm. 



It has been necessary, for economic reasons, to dispose of some 

 of the fattest non-reacting vaccinated cattle. In these no tubercular 

 lesions were found by the federal inspectors. 



It would seem from these preliminary findings that von Behring's 

 Bovovaccine fails to confer on calves a degree of immunity suffi- 

 cient to absolutely protect them against infection until two and one- 

 half years of age when associated with tubercular cattle on pasture 

 and in corrals. However, this does not contradict evidence that 

 bovovaccinated calves have for a time an increased power of resist- 

 ance to tuberculosis. 



22 



