The Extremities 315 



sac and some weak tincture of iodine injected in its place. The 

 surface of the enlargement should also be painted daily with a 

 strong tincture. Suppuration may or may not result; if it does, 

 free exit should be given to the pus by lancing. Considerable 

 collateral edema may develop. This treatment should be repeated 

 a few times before being abandoned. 



The only other alternative is ablation in the following manner: 

 The animal being narcotised and secured with hopples, the region 

 cleansed, and hypodermic injections of cocaine administered locally, 

 expose the sac by an incision in the skin in the direction of the long 

 axis of the leg and carefully enucleate it. It is usually adherent to 

 the olecranon. Finally, suture the skin with subcuticular silk 

 sutures and provide the animal with a soft bed. 



Epithelial Hypertrophy of the Pads. Corns. This is an 

 infrequent form of growth, but troublesome when it exists. Patho- 

 logically, it is a circumscribed callosity which projects outwardly 

 and inwardly, and forms a depression in the corium. 



Symptoms and Diagnosis. Corns are observed on the plantar 

 . surface of the digits as circumscribed projecting callosities, with 

 regular or festooned contour, and possessed of a deep root. They 

 give rise to much lameness. 



Treatment. Radical treatment is the shortest road to a cure. 

 The callosity should be extirpated or eradicated by means of the 

 actual cautery, and the foot subsequently protected with antiseptic 

 powder, gauze, raw cotton, and a boot, until the parts are regener- 

 ated. 



Interdigital Serous Cysts. These little enlargements are only 

 occasionally met with. They are rather troublesome to deal with. 



Symptoms and Diagnosis. Attention is usually first drawn to 

 their presence by constant gnawing and licking on the part of the 

 animal at the interdigital region. There may be pronounced lame- 

 ness. The little bladder-like sacs are easily discerned. 



Treatment. Radical measures are indicated. Complete re- 

 moval of the cyst-wall, either by dissection or cauterization with the 

 thermo-cautery or silver nitrate pencil is the only alternative to 

 eflfectually eradicate the trouble. 



Carcinoma. As has already been stated, carcinoma may de- 

 velop from a pre-existing non-malignant growth, but it also occurs 

 as such per se. It is comparatively rare. 



