BLISTERS— CAUSTICS, OR CAUTERIES. 455 



5. Sweating Blister — 



Strong Mercurial Ointment . . 2 ounces. 



Oil of Origanum ... .2 drachms. 



Corrosive Sublimate . . .2 drachms. 



Cantharides powdered . . .3 drachms. 

 Mix, and rub in with the hand. 



6. Strong Sweating Blister, for Splints, Eing-Bones, Spavins, 



&c.— 



Biniodide of Mercury . . . 1 to Ij drachm. 

 Lard . . . . . .1 ounce. 



To be well rubbed into the legs, after cutting the hair short ; and followed 

 by the daily use of Arnica, in the shape of a wash, as follows, which is to 

 be painted on with a brush : — 



Tincture of Arnica . . . . 1 ounce. 



Water . . . . . . 12 to 15 ounces. 



Mix. 



7. Liquid Sweating Blisters — 



Cantharides 1 ounce. 



Spirit of Turpentine . . .2 ounces. 



Methylated Spirit of Wine . . 1 pint. 



Mix, and digest for a fortnight ; then strain. 



8. Powdered Cantharides . . .1 ounce. 

 Commercial Pyroligneous Acid . 1 pint. 



Mix, and digest for a fortnight ; then strain. 



CAUSTICS, OR CAUTERIES. 



(7b destroy Proud Flesh in Wounds.') 



Caustics are substances which burn away the living tissues of 

 the body, by the decomposition of their elements. They are of 

 two kinds, viz. : First, the actual cautery, consisting in the appli- 

 cation of the burning iron, and called firing; and, secondly, the 

 potential cautery, by means of the powers of mineral caustics, such 

 as potassa fusa, lunar caustic, corrosive sublimate, &c. 



Firing is described in the chapter on Operations, at page 438. 



The following are the ordinary chemical applications used as 

 potential cauteries : — 



1. Fused Potass, difficult to manage, because it runs about in all 



directions, and little used in veterinary medicine. 



2. Lunar Caustic, or Nitrate of Silver, very valuable to the veterinary 



surgeon, and constantly used to apply to profuse granulations. 



3. Sulphate of Copper, almost equally useful, but not so strong as 



Lunar Caustic. It may be well rubbed into all high granulations, 

 as in broken knees, and similar growths. 



4. Corrosive Sublimate in powder, which acts most energetically 



upon warty growths, but should be used with great care and dis- 

 cretion, it may safely be applied to small surfaces, but not with- 

 out a regular practitioner to large ones. It should be washed off 



