508 DISEASE IN WILD MAMMALS AND BIRDS 
solid nodules of avian tuberculosis, whether they be in 
the lungs, liver, or spleen. When the lung becomes rid- 
dled with masses, coalescence occurs and the whole mass 
turns into a cast of the hemithorax. Lesions in the liver 
are mostly isolated, but the spleen often appears like one 
large pink tuberculous nodule. The liver occupies as 
usual the first place in organic incidence. 
Striges. Owls (and Struthiones — see below) present 
the interesting exception to the rule of intestinal origin 
of tuberculosis in birds. Perhaps the platting is incorrect 
but the birds in the order under discussion had older and 
much more advanced lesions in the lungs and thoracic 
serosa than they did in the abdominal organs. That this 
was true in all three examples is in itself noteworthy. 
Perhaps they possess less pulmonary and more intestinal 
resistance. One of these birds showed a small recent 
cavitation in the posteroinferior angle of one lung. 
Accipitres. With one exception the cases of this 
order occurred among the Falconidae, that is in hawks, 
buzzards, and eagles. Their lesions are usually gen- 
eralized as indicated by the figures for visceral distribu- 
tion, but that half the number should have the oldest, 
most prominent lesions in the lungs is curious. Their 
intestinal tuberculosis seems mostly of the diffuse infil- 
trative type. 
Columbae. These birds are obviously the most sus- 
ceptible of all the varieties of which there are sufficient 
autopsies to make a comparison. Generalized nodular 
lesions emanating from the intestinal tract comprise 
their usual form, while most of the hepatic lesions are 
small miliary and nodular; occasionally one sees caseous 
masses destroying large sections of the organ. Their 
intestinal lesions may assume any of the three 
forms described. 
Galli. This is an order of something over the average 
percentage incidence for the birds but containing famiUes 
that seem very susceptible to tuberculosis. The small 
