Ps 
[gel 
equal in both cafes, as Glauber’s falt lofes part of its and in 
fuch heat. 
Mr. Wiegleb avoided this fource of error, and by that means 
approached nearer to the truth *. He found too grs. of mineral 
alkali, which had been dried by heating it to rednefs, to lofe 
42 grs. of fixed air when faturated with vitriolic acid, and that 
the refulting falt heated to ignition weighed 133 grs.; thefe, 
therefore, confifted of 58 of mere alkali, and 75 of the ftrongeft 
vitriolic acid, confequently 100 parts pure alkali take 130 of the 
{trongeft acid, and afford 230 of dry Glauber’s falt. And elfe- 
where } he fays that roo parts cryftallized Glauber falt lofe 50 
by deficcation. Then if 50 of the dry‘ falt take 50 of water, 
133 fhould take 133, and form 266 of cryftallized falt; and 
hence 100 parts of this falt fhould contain 21,8 of alkali, 28,2 
of the ftrongeft acid, and 50 of water. 
Of Cubic Nitre. 
I sATURATED 367 grs. of the fame folution of mild mineral 
alkali with 147 grs. of {pirit of nitre, whofe f{pecific gravity was 
1,2754, and which contained 45,7 per cent. ftandard. The air 
loft was 14. grs. and by adding 939 of water, its {pecific gravity 
temperature 58°,5 was 1,0401, which by a teft experiment denotes 
ar of falt. There was an excefs of acid of about 2 grs.; 
ae 
the whole weight was 1439 grs.. The quantity of falt was there- 
fore 
* 7 Nev. Entdeck, p. 16. + 2 Handbuck, p. 92. 
