i So Continuation of the Experiments and Obfervations 
acid part; and ioo gr. of common mild vegetable alkali take 
up about 36,23 of real acid. 
100 gr. of perfectly dry tartar vitriolate contain 30,21 of real 
acid, 64,61 of fixed idkaji, and 5,18 of water. Crystallized 
tartar vitriolate lofes only 1 per cent, of ' water in a heat in 
which its acid alfo is not Separated in any degree, and therefore 
contains 6,18 of water. 
100 gr. of nitre, perfectly dried, contain 30,86 of acid, ; 
66 of alkali, and 3,14 of water; but in cryftaliized nitre the 
proportion of water is Somewhat greater ; for 1 00 gr. of thefe 
cryftals, being expofed to a heat of 1 8o° for two hours, loft 
3 gr. of their weight, without exhaling any acid fmell ; but 
when expofed to a heat of 200°, the fmell of the nitrous acid 
is diftincftly perceived. Hence 100 gr. of cryftaliized nitre con- 
tain 29,89 of mere acid, 63,9 7 of alkali, and 6,14 of water. 
100 gr. of digeftive fait perfectly dry contain 29,68 of marine 
acid, 63,47 of alkali, and 6,85 of water. 100 gr. of cryftal- 
iized digeftive fait lofe but 1 gr. of their weight before the 
fmell of the marine acid is perceived ^ and hence they contain 
7,85 gr. of water. 
But the miftake which coft me moft time and pains to cor- 
raft was that which I fell into when I imagined, that the mix- 
tures of oil of vitriol and water, and Spirit of nitre and water, 
had attained their maximum of denlity when they had cooled 
to the temperature of the atmofphere, which at the time I 
made my experiments flood between 50 and 6o° of Fahren- 
heit. The former I had even Suffered to. ftand fix hours, 
which was much longer than was necefiary for its cooling; but 
when the acid was fo much diluted as to caufe little or no heat, 
I allowed it to ftand but for a very little time before I examined 
ks denlity : yet Several months after I found many of thefe 
f mixtures 
