[ 250 ] 



But there are two other experiments which fet the inaccuracy of 

 his detei mination in a flill clearer light, the one executed by 

 Mr. V> olfe, aud the other by Dr. Black f. 



Mr. Wolfe found that I2Q parts muriated filver or luna 

 cornua, when decompofed by tartarin, afforded 55 grains of 

 fylvian or muriated tartarin; thefe 55 grains therefore contained 

 all the acid that exifted in 1 20 of muriated filver. Now Dr. Black 

 found that 235 grains of muriated filver contain all the acid that - 

 exifts in 100 grains of common fait, and confequently 120 grains 

 of the muriated filver contain all the acid that exifls in 51,06 of 

 common fait, whence it follows that 55 grains of fylvian and 

 51,06 of common fait contain x!^^ Jame quantity of acid, fince the 

 firfl received and the latter gave out all the acid that exifls in 

 120 parts muriated filver. 



We may now fee in which of the 2 different flatements this 

 equality is found, or whether in neither or in both. 



ift. According to Bergman ico grains of muriated tartarin 

 contain 31 of real acid, then 55 grains of that fall fhould contain 



Again, ico grains of common fait contain by his flatement 

 52 of real acid, then 51.06 of this fali ftiould contain 27,55 ; ihefe 

 quantities are evidently very diflant from an equality, 



2d. 



\ Phil. Tranf. 1776, p. 611. 3 Edinb. Tranf. 116. 



