298 DISEASES OF HORSES AND CATTLE. 



interfere with thesight,the auimal becomes shyer; 

 the derangement goes on until the lens becomes 

 opaque and the sight is lost. Operations for cat- 

 aract on animals are not practicable. 



Fungus Ilaematodes. — This consists of a tumor 

 in the cavity of the orbit. It appears at first as a 

 dark red spot, becoming larger until it involves a 

 part of the membrane of the eye and the lining of 

 the orbit. The tumor is very vascular and is easily 

 made to bleed and is malignant in its nature, being 

 a medullary cancer infiltrated with blood, and is 

 usually of a very rapid growth and is most com- 

 monly seen in cattle, although I have seen it in the 

 horse. 



Treatment: I have removed it successfully by in- 

 jecting absolute alcohol into it in several places. 

 This is the easiest and best way. It can be re- 

 moved with the knife and the roots touched with 

 nitrate of silver every second day for a week. 

 When the bones of the orbit become diseased, 

 which can be known by the very foul smell issuing 

 from it, the animal should be destroyed. 



