[ 205 ] 



mere foda taken up by a given weight of real vitriolic acid, are 

 confirmed by an experiment of Mr. Fourcroy's, 2 Ann. Chy. 289. 

 for he found that the fame quantity of vitrioHc acid which faturated 

 193 grains of the cryftaHized foda alfo faturated 188 of cryftallized 

 tartarin. Now I have afligned 21,58 per cent, of mere alkali to 

 cryftallized foda, therefore 193 grains of it contain 41,6, and as 

 the cryftallized tartarin contains 41 per cent, of alkali, 188 grains 

 of it contain 77. I have alfo fhewn that 100 grains real vitriolic 

 acid take up 78,32 of mere foda, and 121,48 of mere tartarin, 

 then the harmony of thefe proportions with Fourcroy's experi- 

 ments will thus appear: 3578,32. 121,48:: 41.76,36; the dif- 

 ference between us is only 0,64 of a grain. 



V SeSfion 3^. 



Barolite and Baroselenite. 



100 parts barytic earth precipitated from its folution in acids by 

 a mild alkali, whether fixed or volatile, and heated to gentle igni- 

 tion, contains 78 or 79 parts of earth, 21 or 22 of fixed air, about 

 1,5 ^e ftronthian earth, a quantity which in this cafe deferves 

 little attention. See i Klapr. 271. 2 Klapr. 82 and 86. 2 Chy. 

 Ann. 1793, 196. I Chy. Ann. 1795, 1 1 1. Hence 100 grains 

 barytic lime take up 28,2 of fixed air, and 100 grains of fixed 

 air would precipitate 354,5 of barycic earih, and probably more, 

 as the earth may not be faturated. 



Baroselenite 



