278 AGRICULTURAL BACTERIOLOGY 



Fig. 40. Tuberculosis Spread by Creamery Byproducts 

 The tubercular animals are represented by dots, healthy animals by circles. In 

 the two bounded areas thirty per cent, of the cattle were diseased. Outside 

 of these districts but five per cent, were tubercular. The feeding of mixed 

 creamery skim milk was the principal cause of the conditions within the 

 bounded areas 



