310 DISEASES OF CATTLE. 



Those tumors that can not be removed by the above methods may be 

 treated with caustics or acids, such as sulphuric acid, hydrochloric 

 acid, caustic potash, arsenic, silver nitrate, or chromic acid, but it is 

 difficult to limit the action of these drugs. The injection into the 

 tumor of certain chemicals, such as analine dyes, alcohol, acetic acid, 

 citric acid, or ergotine is of doubtful value, as is also the injection of 

 the germs of erysipelas— thought by some to be a specific. Certain 

 specific tumors, such as actinomycosis and botryomycosis, may be 

 successfully treated by the internal administration of potassium 

 iodid, together with the injection into the tumor or the painting of 

 its surface with Lugol's solution or the tincture of iodin. The most 

 reliable means of treating tumors is by extirpation with cutting instru- 

 ments. Dissect the tumor from the surrounding tissue, ligating all 

 the larger blood vessels, and tearing the tissues with the fingers rather 

 than cutting with a knife. The bleeding may be stopped with a hot 

 iron. The after-treatment is the same as for any ordinary wound of 

 similar size. 



DESCRIPTION OP INDIVIDUAL TUMORS. 



Although a full list of the tumors that may be found in bovines has 

 been given above, there are a number that warrant a detailed descrip- 

 tion, and the following mention will be made of the most important 

 of them : 



* MYOMA. 



These tumors are after the type of muscle. They are sharply cir- 

 cumscribed, and, as a rule, are very hard, a condition due usually to 

 combination with fibroma, and are then known as fibromyoma. In 

 fact, the clinical differentiation between myoma and fibroma is almost 

 impossible. Myomas are found in the uterus, vagina, stomach, intes- 

 tines, gullet, and bladder of cattle. They grow very large, but, as a 

 rule, are benign. Treatment should consist of their removal. • 



NEUROFIBROMA. 



A true neuroma built up of nerve fibers and nerve cells is infre- 

 quent, if it ever occurs, in cattle. False neuromas, or neurofibromas, 

 are knotty spreading tumors of the size of a large potato, which are 

 developed within the nerve sheaths and composed of nerve fibers and 

 connective tissue bands interlaced. The commingling of these varied 

 fibers is often so intricate that separation is practically impossible. 

 This tumor is most frequently found upon the shoulder of cattle. 

 Treatment is surgical. 



The angiomas are tumors composed mainly of blood vessels or blood 

 spaces, and are observed on the skin of man, where they are called 

 "birthmarks" or " mother marks." Cavernous angiomas are seen in 



