Tuberculosis 



117 



subject of very great importance to the poultryman, not 

 only on account of his flock but also on account of its relation 

 to the health of himself and his family. The bacillus asso- 

 ciated with avian tuberculosis presents certain morphological 



Fig. 11. — Section of the lung of a hen showing tubercle bacilli. (After 

 Himmelberger.) 



and physiological characteristics which are different from the 

 organism associated with this disease in man. Likewise the 

 bacillus of human tuberculosis is differentiated in certain 

 marked features from that found in cattle. On the whole 



