544 PRINCIPLES OF VETERINARY SURGERY 



the infiltration, is well advanced the structure of the lungs 

 disappears. The bronchial cartilages resist the action of 

 melano-sarcomata found distributed among the masses. 

 Their cells are of a violet tint, shown for the first time by 

 Cornil and Trasbot. 



The Nervous System. — Melanosis is found in the men- 



FiG. 64. Melanosis of a Spleen, Weighing 7 Kilograms. 



inges of the brain, the cranium or in the neural canal (Fig. 

 65). The pigment is accumulated in the connective tissue 

 or the bones surrounding the meninges. They may pene- 

 trate through the communicating foramina at the roots of 

 the nerves. The masses grow regularly, atrophy the cere- 

 bral substance and may attain the size of an egg. Jessen 



