highly concentrated vitriolic acid and three parts water, and 2dly, 

 that 240 grains of this fp. contained 75 75 of fuch acid as is 

 found in ignited tartar vitriolate which is what I call real acid. 



'to' 



Whence I deduce that j- of his fp. of vitriol confifted of the 

 highly concentrated acid, and | of water. Now 240 X | = 96, 

 therefore 96 grains of the concentrated acid contained 75,75 of 

 real acid, then loogrs. of it would contain 78,9, which quan- 

 tity belongs to a fp. grav. intermediate between the tabular den- 

 fities 1,8542 and 1,8424, and by the fecond problem will be found 

 to be 1,8467, therefore when one part of it is mi,Ked with li of 

 water, or for inftance, when ico grains of it are mixed with 

 150 of water, (which is the fame as mixing two parts with three) 

 the compound amounting to 250 grains contain 78,9 real acid, 

 and ] 00 grains of this dilute acid contain 31,56 of real acid, a 

 quantity which is evtratabular, l^ut belongs to a fp grav. which 

 by the fecond problem will be found to be 1,2987. 



Therefore the fp. gi'av. of Wenzel's oil of vitriol is 1,8467 

 containing 78,9 real acid per cent and the fp. grav. of his fpirit 

 of vitriol was 1,29^7, containing 3 r, 56 percent real acid.. — 261,976 

 (262 grs.) of his fpirit of vitriol would faturate 100 grs. of tartarin. 



loco grains of Dr. Black's dilute vitriolic acid contained 7,425, 

 real acid. As I found it has lately been denied that vitriolated 



tartarin 



