CAUSTICS—CHARGES. 357 
For bony growths or other tumours: 
28.—Tincture of iodine. 
re Painted ou every day, by means of a common painter’s brush. 
T, 
29.—Red iodide of mercury, 1 to 14 drachms. 
Lard, 1 ounce. 
Mix, and rub in a piece the size of a nutmeg every day, keeping the 
as wet with tincture of arnica, $ ounce, mixed with half a pint 
of water. 
CAUSTICS. 
This name is given to substances which either actually or 
potentially destroy the living tissue; the actual cautery is an iron 
heated in the fire, the potential of some chemical substance, such 
as corrosive sublimate, lunar caustic, caustic potash, a mineral 
acid, or the like. The actual cautery, or firing, is not often used 
for the dog, but in some cases it is of great service. Both kinds are 
used for two purposes—one to relieve the effects of strains and other 
injuries of the limbs, by which the ligaments are inflamed ; and 
the other to remove diseased growth, such as warts, fungus, dc. 
30.—Firing, when adopted for the dog, should be carried out with a very 
small thin-edged iron, as the dog’s skin is thin, and very liable to 
slough. Nooneshould attempt this without experience or previously 
watching others. 
31.—Lunar caustic, or nitrate of silver, is constantly required, being very 
manageable in the hands of any person accustomed to wounds, &, 
32.—Sulphate of copper, or bluestone, is much milder than the lunar caustic, 
and may be freely rubbed into the surface of fungus or proud flesh. 
It is very useful in ulcerations about the toes, 
33.—Fused potass is not fit for any one but the experienced surgeon. 
34.—Corrosive sublimate in powder may be applied, carefully and in very 
small quantities, to warts, and then washed off. It is apt to extend 
its effects to the surrounding tissues. 
35.—Yellow orpiment is not so strong as corrosive sublimate, and may be 
used in the same way. 
36.—Burnt alum and white sugar, in powder, act as mild caustics. 
CHARGES, 
Charges are plasters which act chiefly by mechanical pressure, 
being spread on while hot, and then covered with tow. They are 
not much used among dogs, but in strains they are sometimes 
useful, as they allow the limb to be used without injury. The 
best for the dog is composed as follows : — 
