THE COMMUNICABLE DISEASES 503 
Hemosiderin pigmentation of liver. Acute parenchymatous nephritis. 
Chronic passive congestion of spleen. Chronic hyaline perisplenitis. 
Multiple calcified fibroid tumors of uterus. Leiomyoma of uterine cornu. 
Senile atrophy of ovaries. Acute catarrhal enteritis. There are some 
adhesions of the upper lobes of the lung to the ribs. The lungs are 
large, increased in weight, color pink and mottled red, air content 
diminished. There are several masses of tubercles, each as large as 
a cocoanut, in both lobes. In one such the tubercles are yellow and 
caseous ; some are fibroid but none are liquefied or calcified. The fibrous 
tissue of the lung parenchyma here is much overgrown. In one instance 
the terminus of a bronchus is solidly plugged by caseous material. 
Mucosa of bronchi is reddened, markedly ulcerated, ulcers overlaid 
by mucopus. 
Individual Featuees of Avian Tuberculosis. 
The avian form of tuberculosis is somewhat peculiar 
in its physical appearance as well as in its distribution. 
The isolated nodular type is far and away more common 
by more than 100 per cent, than all the other types com- 
bined. These nodules are usually well circumscribed, 
and to the naked eye suggest that they have a restraining 
fibroid wall. This is, however, not the case, the impres- 
sion being due to the dense but actively growing fibro- 
cellular cortical zone of the tubercle. The centre of the 
nodule, instead of having the soft character like Camem- 
bert cheese, resembles the firm but brittle American dairy 
cheese. Upon opening such an area the central necrotic 
mass may split away from its cortex and even shell out, 
lea\'ing a cavity lined by a gray-yellow membrane. These 
characters are best displayed in nodules of moderate size, 
the small ones being like the yellow mammalian analogue, 
the large being like indefinite cheesy masses. In the sur- 
rounding tissue evidences of inflammatory processes 
seem decidedly greater in our material than I am accus- 
tomed to see in human and veterinary pathology. This, 
it seems, should be emphasized since secondary infection 
with pus cocci and other pathogenic germs appears less 
often in birds than in mammals. 
The difference speaks, therefore for a difference 
either in the tubercle bacillus of birds or the avian physi- 
