[ Sass] 
Hence, 3dly, we may eftimate the ftrength of his fpirit of 
falt; for fince 202 grs. of it contained 46,5 of the ftrongeft acid, 
which are equivalent to 96 of ftandard, 100 parts of it muft 
contain 47 of ftandard, and confequently its fpecific gravity was 
about 1,1892 *. 
Ir is moft probably to the great heat employed that we 
muft afcribe the difference between all the above refults and 
that of Mr. Wiegleb, for he found that 104 grs. of falt of 
fylvius contained 83 of alkali and only 21 of the ftrongeft 
acid. 
Of Glauber’s Salt. 
A gvantity of cryftallized mineral alkali being evaporated 
to drynefs, and then heated to rednefs in a filver crucible, was 
diffolved in pure water in fuch proportion that 367 grs. of the 
folution held 50,05 of dry mild alkali. 
On 367 gers. of this folution I gradually poured 75 grs. of 
vitriolic acid, whofe fpecific gravity was 1,565, and which con- 
tains 61 per cent. ftandard; the lofs of air was 18 grs. and 
when it was ftill further diluted by 480 grs. of water, its fpecific 
gravity, temperature 55°, was 1,0670, which by a ftandard 
experiment, fimilar to thofe already mentioned, I found to denote 
that 
* His own conclufion is, that 240 grs. of his fpirit of falt contain 54 of the 
ftrongeft acid. 
