BLISTERS. 235 



No " 



I 



Common tar, - - - 4 oz. 



Vitriolic acid, - - 2 dr. 



Oil of origamim, - - i oz. 



Hog's lard, - - 2 oz. 



Spanish flies, powdered, 14 or 2 oz. 



Add the vitriolic acid gradnall}- to the tar, and 

 then the rest of the ingredients. 



Remark. — The blister No. 3 is remarkably 

 useful in removing enlargements of the back 

 sinews or windgalls. It is necessary to be 

 very careful in mixing the vitriolic acid with 

 the tar; for unless they are intimately in- 

 corporated, the acid will act as a caustic upon 

 the skin, and produce ulceratian. I have seen 

 horses suffer severely from this, particularly 

 when in blistering the legs it has been applied 

 also to the back part of the pastern, or to the 

 heel, a part that should always be protected 

 from the action of the blister, by ha\Hng some 

 hog's lard smeared over it ; beuig so irritable 

 that a blister sometimes causes ulcers, which 

 in this part are difficult of cure. Subhrnate 

 is often recommended as an ingredient in blis- 

 ters, but it is very apt to ulcerate the skin, and 



