PRINCIPLES OF VETERINARY SURGERY 543 



markable feature is the fact that they are always globular. 

 The outer color is brown with violet or bluish streaks. The 

 tissue, when cut, is marbled, and resembles a Strasburg pie 

 well stufifed with truffles. The tissues hiss when cut with 

 a sharp instrument, and a deep black blood escapes, but no 

 central softening nor suppuration can be found. Intermedi- 

 ate phases of the disease may, of course, be encountered. 



The kidneys, suprarenal capsules, and the ovaries may 

 also be invaded with simple melanosis or melanotic tumors. 

 Cunningham drew attention to a melanotic tumor weighing 

 ten pounds attached to the left kidney, and Nibbert found a 

 kidney enclosed in a sort of melanotic sack. 



The parotid gland and the udder are frequently invaded 

 in aged animals. When the mammae are invaded with 

 melanotic masses the skin is tightly drawn and glistening. 

 The thyroid body is sometimes the seat of a pigmentary 

 infiltration, and at others is invaded with melanotic sar- 

 coma. And lastly, horses attacked by generalized melano- 

 sis exhibit pigment in the blood, but only in agglomerated 

 masses all i-eady to form tumors. 



The pancreas is occasionally invaded. Bruckmuller saw 

 melanosis of the connective tissue of the pancreas in the 

 form of tubercles ranging from the size of a pea to that of 

 i,a walnut, with pigmented deposits in the neighboring con- 

 nective tissues. 



The Lungs. — Simple melanosis and melanotic tumors 

 are found in the lungs. The former sometimes imparts a 

 slaty gray color to the organ analogous to that of pro- 

 nounced anthra-cosis, but the chemical -ch^raetei'S' -dist4n- 

 guish the anthracotic particles from pigmentary granules. 

 Under the microscope, fibrous neoplasms and pigmentary 

 infiltration of the different cells is seen. The melanotic 

 tumors of the lungs usually correspond to the sarcomatous 

 type and are of variable numbers and dimensions. When 



