WRK aad 
. alkali fhould take up 87,5 of the ftrongeft marine acid, and 
afford 187,5 of common falt, which is nearly my conclufion. 
Mr. Bergman’s proportion deviates fo widely from thefe re- 
fults, that I can in no way account for it. He attributes to 100 
parts of this falt, 42 of alkali, 52 of acid, and 6 of water. 
Of Ammoniacal Salts. 
Berore I proceed to the analyfis of thofe formed by the 
mineral acids, it will be neceflary to examine the compofition of 
aerated volatile alkali, which was the fubjet of my experi- 
ments. 
TueE proportion of ingredients affigned to this falt by Mr. 
Bergman is 12 ef water, 45 of fixed air, and 43 of pure alkali. 
How he has difcovered this proportion he no where explains, 
nor do I know any other method of exploring it with accuracy 
than by having recourfe to Dr. Prieftley’s experiments, vol. ii. 
of his new edition*, 
By thefe it appears that 2 meafures of alkaline air are fatu- 
rated and reduced to a concrete form by 1 meafure of fixed air 
very nearly. Now 100 cubic inches of alkaline air I have found 
to weigh 18,16 grs.; and 100 cubic inches of fixed air 46,5. 
Let 
* Page 386. 
