CONSTITUTIONAL DISEASES 119 



If scraps be fed to which tuberculous sputum 

 has found its way or if the birds are allowed to 

 devour parts of an animal dead of the disease, 

 there is a liability of their contracting tubercu- 

 losis. 



There is also a possibility that birds, by fol- 

 lowing tuberculous cattle, may become infected, 

 as do hogs. It has been argued that the temper- 

 ature of the bird is so high (105° F. to 107° F.) 



A B 



Fig. 42. Tuberculosis in a Hen 

 A, Spleen showing miliary tubercules. 

 B, liver showing miliary tubercules. 



that it furnishes an unfavorable field for the hu- 

 man and bovine types of germs, which thrive at 

 temperatures close to 98° and 101° F., respective- 

 ly. It has, however, been found that these germs 

 soon adjust themselves to such changes in tem- 

 perature and to a certain degree to differences in 

 food. 



One case, a hen, was sent to the lahoratory with the history 

 of having had access to the sputum of a person afflicted with 

 tuberculosis. Upon autopsy small pearl-like nodules were 

 found throughout the liver (See Fig. 42), in the lung sub- 

 stance and over the serous lining covering the intestines and 



