PRINCIPLES OF VETERINARY SURGERY 



553 



variable functions it is capable of provoking. Besides, flesh 

 of melanotic horses is cojidemned as food, and as the ma- 

 jority of white horses are affected at an advanced age, the 

 white horses cannot be consigned to the butcher. The grav- 

 ity also depends upon their nature. Simple melanosis, 

 or melanosis by infiltration, is always less grave than mel- 



FiG. 69. 

 Melanosis Surrounding the Rectum. 



anosis with tumors. In this form the fibromata and myxo- 

 mata are benign. They never become generalized, as dif- 

 ferent observations testify. 



Mawry reports that on two occasions he removed a mel- 

 anotic tumor from the extremity of the tail of a bay horse. 

 In this case, after the second reappearance of the tumor, 

 sy^iptoms of paralysis appeared and the autopsy disclosed 



