foregoing determinations, and bad the pleafure of findinsj an al- 

 tnoft perfed coincidence. See 3 Edinb. Tranf. p. lor, 102. 

 Dr. Black to vitriolic acid whofe fp. grav- at 60^ was 1,798, added 

 100 times its weight of water, and found that 112 grs. of this 

 , dilute acid faturated exadly i gr. of tartarin. 



application. 



To exclude fradions I fhall multiply Dr. Black's quantities by 

 JOO; then if 200 grains of vitriolic acid 1,798 were diluted with 

 soooo grains of water, his dilute acid would confifl: of 20200 

 grains, 11 200 of fuch dilute acid would faturate 100 grains of 

 tartarin. Now vitriolic acid 1,798 differs infenfibly from 1,7959 

 which by my table contains 75 grains per cent, real acid. There- 

 - fore 1 1 200 grains of fuch acid fo diluted would contain 83,16 

 real acid, which differs from my determinations only by ~- of a 

 grain. 83,16 — 82,48 = 0,68. 



Hence we may find the fp. gravity and quantity of real acid 

 in the fp. of vitriol employed by Wenzel, which it will be ufeful 

 to know as he made feveral interefling experiments ; and thus 

 alfo the accuracy of the table of vitriolic acid will be flill far- 

 ther confirmed. 



For this inveftigation he has furnifhed us with two datat, 

 I ft, he tells us that his fp. of vitriol was formed of two parts of " 



B b 2 • highly 



