65 



rated, and this forms the running. In a day or two 

 the irritation of the blifter ceafes, and the part is 

 then in the condition of a common wound, and, as 

 fuch, produces matter. At the fame time, likewife, 

 that a blifter ads on the fkin, it fiimulates the fur- 

 rounding abforbents to take up other fluids ; and if 

 the blifter is itrong, and they are much excited, 

 they even remove the folids. 



Mercury is known to ftimulate thefe veffels mor-e 

 than moft other fubftances ; therefore, when we wifh 

 particularly to ftir up the abforbents to remove a 

 part, we make ufe of a mercurial blifter ; that is, 

 calomel, or corrofive fublimate, is mixed with the 

 Spanifli flies, euphorbium, or whatever the blifter is 

 compofed of. Mercurial blifters are, therefore, ufed 

 for fplents, curbs, ring-bones, &c. ; but when we 

 only wifli to inflame a part, thereby to draw the in- 

 flammation from fome other part, we content our- 

 felves with the flies, or other Amply irritatii^ fub- 



ftance. 



It is a law in the animal economy, that two in- 

 flammations feldom exift in the vicinity of each 

 other; therefore, when an inflammation has taken 

 place in any part, and we wifli to remove it, we at- 

 tempt to raife an artificial inflammation in the neigh- 

 bourhood, by means of blifters, which, if we efted, 

 v;e remove, or at leaft leflen, the more natural in- 

 ilammatioii. Therefore, in inflammations of the 



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