[ 337 ] 
Terra foliata tartari 
1 > 5 6 7 
J »933 
Glauber’s fait from Lymington 
i » 6 57 
2,000 
Rochelle fait 
L 757 
2,071 
Alum 
1 » 757 
2,071 
Borax 
«»757 
Green vitriol 
I,8l 2 
2,230 
White vitriol 
1 >933 
2,416 
Nitre 
L 933 
2,766 
Very tranfparent fal gem. from 
Nortwich 
2 U 43 
Blue vitriol purified 
2,230 
2,900 
Pearl afh 
2,320 
5,800 
Vitriolated tartar 
2,636 
5,272 
Green vitriol calcined to whitenefs 
2,636 
5,272 
Dry fait of tartar 
2,761 
4 , 46 1 
Baiket fea fait 
3 >° 5 2 
3,866 
Corrofive fublimate 
4,142 
5,800 
Mercury diftilled with acid of 
vitriol, and freed from its 
acid by a ftrong fire 
6,444 
The numbers in the firfl column correfpond 
very well, upon the whole, with the fpecific gravities 
which have been determined by others hydroftati- 
cally ; thus the fpecific gravities of nitre; alum, 
white and green vitriol, fal ammoniac, lal gemmae. 
See. are greater than what are afiigned to thefe 
bodies by fome authors, and lefs than what have 
been determined by others ; it feems as if the fpecific 
gravities of faline bodies might, in a proper veflel, be 
more accurately afeertained from the obferved increafe 
of the water’s bulk than any other way. Upon the 
fuppofition that the efcape of the air is the reafon of 
Vol. LX. X x the 
