362 ESSAYS AND OBSERVATIONS 



effecfl on one part, we could not, a priori^ 

 determine what it would be on another 

 part. 



8. We may indeed prefume, that the 

 effedls of all the torementioned medi- 

 cines, when they are applied to the found 

 outer furface of the body, are chiefly ow- 

 ing to their abforprion, mixture, and 

 conveyance wi'h the blood, fince they ope- 

 rate as violently, and nearly as foon, 

 when the nerves of the part to which 

 they are applied are cut, as when they are 

 entire. 



If, again, they are applied to the more 

 feniible inward lurface of the primae viae, 

 they may probably operate more fpeedi- 

 ly, and, in fome cafes, more violently, 

 through the nerves alone, than by their 

 being abforbed and conveyed with the 

 blood. 



And whether a medicine is applied in- 

 wardly or outwardly, the quantity of it, 

 or of its vehicle, or the nature of the part 

 to which it: is applied, will probably alter 

 the proportional efl^ect, in the one or in 

 the other way» 



9. Th£ 



