OF VETERINARY MEDICINE. 223 



e. Lipoma. 



f. Chondroma. 



g. Osteoma, 

 h. Glioma. 



2. Myomata. 



3. Neuromata. 



4. Angiomata. 



5. Epitheliomata. 



6. Teratomata. These are mixed tumors, which are 



composed of all kinds of tissue. They are con- 

 genital. Teeth and hair may be found in them. 

 Tumors of the first and fifth classes are most likely to be- 

 come malignant. A malignant tumor is called a cancer, and 

 there are several different kinds, such as hard, soft, pigmented, 

 etc. A hard cancer is called a scirrhus cancer, especially by the 

 old writers. A scirrhus cancer is very hard and dense and con- 

 sists of white tissue. It is sometimes of uneven hardness ; other 

 times it has hard projections extending from it into the tissue to 

 which it is attached. The tumor cuts like cartilage and from the 

 cut surface a persistent hemorrhage is prone to occur. When 

 operating it is difiicuit to arrest the hemorrhage. The scirrhus 

 has a special liking for the lymphatic glands. Unless such a 

 growth interferes with mastication or some other functional ac- 

 tivity it will produce little or no harm until it begins to break 

 down, when ulceration may take place and eventually the tissue 

 refuses to heal. Early removal with the knife is the only 

 treatment. 



As examples of the soft cancers may be mentioned the en- 

 cephaloma, fungus haematoid, seen growing in the eyes of cat- 

 tle, medullary fungus, etc. The soft cancerous fungi may be 

 found in any of the tissues, but mostly in the glands. In the 

 horse it is often found on the penis and may extend to the testi- 

 . cles ; also on the vulva in the mare. It may affect bones and may 

 arise in the periosteum. To the touch the tumor has a soft 

 fluctuating feel, but there is no pus in it. Upon cutting into it a 

 profuse hemorrhage will take place. Around such tumors is a 

 network of veins which have increased in size greatly and this 



