[ 19 J 
100 parts ftlandard fhould lofe 10,75. of 89.25 parts of acid of 
the ftrength of that which unites to veg. alkalies, and is found 
in tartar vitriolate, contains as much real acid as roo parts ftan- 
dard. And hence roo parts of this ftrong acid are equivalent to 
112 of ftandard. Therefore 100 parts cauftic dry veg. alkali 
take up nearly 92 of fiandard vitriolic acid, or 82 nearly of the 
ftrongeft vitriolic acid, and afford 182 of tartar of vitriolate in 
its common dry cryftallized ftate. This laft conclufion is the moft 
certain, being independent of any error in the calculations of the 
table. 
100 parts tartar vitriolate contain 55 of mere alkali and 45 of 
the ftrongeft acid, equivalent to about 50,42 of ftandard. 
Hence there is no reafon to fuppofe that this falt contains 
any water of cryftallization, but rather the contrary. In a heat 
below ignition it lofes no part of its weight, and in a red heat 
continued for half an hour it falls into powder, but 100 grs. loft 
only one, which might have been diffipated or hgve been only 
fome accidental moifiure or impurity, or part of its acid. Mr. 
Storr remarked that it loft no water of cryftallization in any 
degree of heat under 590. 2 Nev Entdeck. 227.- 
To compare the refults of this mode of inveftigation with 
thofe of that which I formerly ufed, I evaporated the faturate 
folution to drynefs, ufing at the end a heat of 360°. The falt 
thus formed weighed 158 grs. which increafe of weight may be 
owing to duft fallen in during the evaporation. I alfo made a 
few experiments to afcertain the accuracy of my table, of which 
D2 I fhall 
