172 VETERINARY MEDICINE AND SURGERY. 



Arsenious acid 3 i. 



Carbonate of potassium 3 i. 



Water § xij. 



Boil together slowly until the arsenic is fully dissolved, and strain when 

 cold. The dose for a horse is from half an ounce of this liquor two or 

 three times a day in his food or water. 



Ointments should not be applied to the heels, because the dust and 

 dirt which they collect are apt to irritate the sores. In the acute stage, 

 an application of crude carbolic acid will be serviceable; wash the parts 

 afterward with castile soap and tepid water, and then wrap them with 

 bandages drawn snugly, but not too tight, wet with a lotion of: 



Acetate of zinc gr. xxv. 



Water 1 pint 



and applied as soon after being wet with the solution of the salt as possi- 

 ble; renew twice or three times daily. 



The solution of subacute of lead is preferred by some in place of the 

 zinc. 



If the disease has been suffered to run on to the ulcerative stage, the 

 sores may be washed with a solution of nitrate of silver, until a healthy 

 action is established. If, however, grapes have formed, the excrescences 

 will need to be cut off. The plan recommended by "Williams is generally 

 considered the best, and is as follows: 



Two blacksmiths' fire-shovels are the best instruments; one to be 

 made sharp at its edge, and heated to a red heat, to remove the excres- 

 cences; the other kept cold, and placed between the skin and hot shovel, 

 to prevent undue burning. Many of these excrescences may be thus re- 

 moved in a few minutes; whereas, if they are destroyed by caustics, such 

 as the sulphate of zinc, corrosive sublimate, or the strong acids, the de- 

 struction must be effected by slow degrees, or deep and extensive slough - 

 ings of the skin and subcutaneous tissue may occur. When, however, 

 the grapes are few in number, their points may be carefully dressed with 

 the sulphate of zinc or corrosive sublimate, care being taken that the 

 applications be not too extensive. 



Chronic eczema, when expressed by an eruption other than that of 

 grease, requires a specialty of treatment applicable to itself. 



1st. The crusts and scabs, after being soaked with oil for a few hours, 



