i54 THE HOKSE. 



39. Vert Strong Blister (Counteb-Ieritant) — 



Strong Mercurial Ointment . . 4 ounces. 



Oil of Origanum . . • • ^ ounce. 



Finely-powdered Euphorbium . . 3 drachms. 



Powdered Cantharides . . . i^ ounce. 

 Mix, and spread. 



40. Rapidly Acting Blister (Counter-Irritant) — 



Best Flour of Mustai-d . . .8 ounces. 

 Made into a paste with water ; then add — 



Oil of Turpentine . . . . 2 ounces. 



Strong Liquor of Ammonia . . 1 ounce. 

 This is to be well rubbed into the chest, belly, or back, in cases of 

 acute inflammation. 



41. 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. 



42. Strong Sweating Blister, for Splints, Ring-Bones, Spa-v^ns, 



&c.— 



Biniodide of Mercury . . . 1 to li 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. 



43. 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. 



44. Powdered Cantharides . . .1 ounce. 

 Commercial Pyroligneous Acid . 1 pint 



Mix, and digest for a fortnight : then strain. 



CAUSTICS, OR CAUTERIES. 

 ( To destroy Proud Mesh in Wounds.') 



Caustics are substances which burn away the h'ving 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 : — 



