Microbic Diseases Individually Considered. 223 



abdominal form, the most frequent, is characterized 

 by confluent lesions in the spleen, mesenteric glands, 

 liver, and intestines; in the thoracic form the changes 

 occur chiefly in the lungs ; the latter also develop, but 

 more slowly, as a sequel to abdominal tuberculosis. 

 According .to M. ISTocard, who gave us our first in- 

 formation upon tuberculosis of the horse, this disease 

 is often accompanied with a polyuria of remarkable 

 intensity. 



In the dog the disease also occurs under the two 

 forms observed in the horse. A considerable number 

 of cases of tuberculosis in this species have already 

 been communicated. We ourselves have seen two 

 cases. In the first the liver was enlarged and infil- 

 trated with a neoplastic tissue of a grayish color, which, 

 under the microscope, was resolved into miliary tuber- 

 cles destitute of giant cells. The hepatic and mesen- 

 teric glands were much tumefied, and partly caseous. 

 The lung contained two nodules of the size of a pea. 

 The second dog showed generalized tuberculosis of 

 both lungs, and of the bronchial glands. 



The ape is very susceptible to the disease, and very 

 readily contracts it in our climate. 



In fowls the abdominal viscera are most affected, 

 and this often to an excessive degree. In this species 

 the liver seems to be the place of predilection for the 

 tubercles ; sometimes the latter are absent, only a con- 

 siderable enlargement with degeneration of this or- 

 gan being observed, but the spleen, intestines, and 

 peritoneum may, at the same time, be studded with 

 lesions. The lung is rarely affected. 



Microbe. — The efiicient cause of tuberculosis resides 

 in the bacillus of Koch. This shows itself under the 



OF THE 



UNIVERSITY 



S'F m icfMj»i\K 



