PRINCIPLES OF VETERINARY SURGERY 557 



peds, enter into the explanation of the melanic pathogene- 

 sis. In fact, kidneys as black as ebony have been found in 

 dark colored animals. 



Adults. — As in the case of solipeds, there are two modes 

 of melanotic deposits, — the neoplastic and the simple de- 

 posit. There are numerous examples of the one and of the 

 other form, which facts demonstrate that it is not enough 

 for a tumor to exist in order that melanin be deposited. 

 Dupont and Denuce point out that the melanic pigmenta- 

 tion of the peritoneum rendered the abdominal serous 

 membrane perfectly black, and Morot draws attention to a 

 similar infiltration of the parietal pleura. Gurlt has also 

 found melanosis in the intestinal mucous membrane of a- 

 cow, a somewhat unusual case, according to Zundel, who 

 says that melanoses are only observed in the subcutaneous 

 tissue. Perroncito has described melanosis in the ox simul- 

 taneously affected with tuberculosis. Baillet has reported 

 a case of melanic infiltration of the lumbar division of the 

 neural canal, and of a portion of the pancreas. Browier 

 and Megnin have observed a melanic infiltration of the long 

 bones and the flat bones, and Mosselmann et al have pub- 

 lished two interesting cases concerning abnormal coloring 

 of the skeletons of animals intended for the shambles. 

 Nothing characteristic was found in the viscera, but the 

 entire osseous system exhibited a characteristic red-brown 

 tint. The osseous tissue appeared uniformly colored 

 in its dififerent layers. Chemical analysis demonstrated 

 that the coloring matter was represented by nitro- 

 genous and ferruginous organic products, while according 

 to Borow the organic pigment would contain 0.25 per cent 

 of iron. Microscopic examination reveals that the coloring 

 matter is not uniformly distributed in the osseous sub- 

 stance, but, on the contrary, is found settled ih the osseous 

 cells or exclusively located in the fundamental substance 



