560 PRINCIPLES OF VETERINARY SURGERY 



the nerve centers, and others have shown the existence of 

 similar deposits in the lungs alone or in the lungs, liver and 

 some of the muscles. Morot refers to several cases of mel- 

 anosis in the sheep. He even found melanotic infiltration 

 of the bones the color of wraxed walnut in a four or five- 

 year-old sheep. LaBlanc found accentuated pigmentation 

 of the anterior portion of the cerebrum of a sheep. Under 

 the name of Black Liver of Russian Sheep, Barrier de- 

 scribes melanotic alterations occupying the periphery of the 

 lobules. The same changes were pointed out by Siedam- 

 grotzky. 



Melanosis in the Hog. 



Of all the domestic animals, the hog is the least subject 

 to melanotic alterations, because usually sacrificed for meat 

 before melanin is deposited. Melanotic deposits occur 

 chiefly in the adult. The pigment has never been observed 

 in the adipose tissue cells of this animal. The few observa- 

 tions on the subject show that the infiltration occurs in tlit 

 interlobular connective tissue tracts. In 1878, Saake observed 

 pigmentation of ventral lard, and De Jong, continuing the 

 study, referred, to an alteration of the bones in a hog, that 

 appeared to be of a melanotic nature. All of the bones, 

 without exception, exhibited a deep black tint. The mar- 

 row of the long bones was brown, the color of chocolate. 

 Ostertag, in his manual refers to black pigmentation of the 

 skin and of the panniculosis adiposus of sows. De Jong 

 concludes that pigmentation occurs chiefly in black and pie- 

 bald pigs. 



The pigments are found in the kidneys and in the liver 

 and according to the observations of Forreggiani it is lo- 

 cated in the capillaries of the kidneys and in the glomeruli, 

 while in the liver it is found in the hepatic cells. 



