[gael 
Of Common Salt. 
367 grs. of the fame alkaline folution, containing 50,05 of 
mild marine alkali, ‘were faturated by 129 grs. of fpirit of falt, 
whofe fpecific gravity was 1,1355 with the lofs of 20 grs. of 
fixed air after fome hours. On adding 26 grs. more of water, 
and 4 of pure common falt, the fpecific gravity of the folution 
was 1,0814 in temperature 60°; which by a teft experiment de- 
noted AE of falt. The weight of the folution was 506 grs. and 
506 
confequently the quantity of falt was Boag = 60,74 grs.; but as 
4 grs. of falt were added, the -weight of the regenerated falt 
fingly was 56,74 grs.; the acid employed contained 34 per cent. 
ftandard, confequently 129 grs. of it contained 43,86 ftandard. 
The quantity of mere alkali was 30,05 grs. the fum of both 
=73,91 grs.; yet only 56,74 grs. of falt were formed, confe- 
quently the difference, or 73,91—56,74=17,17 grs. were mere 
water rejected from the ftandard acid. And if 43,86 ftandard 
lofe 17,17 on uniting to mineral alkali, 100 parts ftandard 
fhould lofe 39,14, and confequently the remainder, viz. 60,86 
party of this ftrong acid, are equivalent to roo parts ftandard, 
or to 48,4 of the ftrongeft, fuch as is found in falt of Sylvius. 
Hence, firft, 100 parts pure marine alkali take up 88,81 of this 
ftrong acid, equivalent to 145,92 of ftandard, and fhould produce 
188,81 of falt. Secondly, 100. parts common falt contain nearly 
53 of alkali, and 47 of acid ftronger than ftandard in the pro- 
portion above mentioned. 
In 
