174 Anatyfis of the Air. 
rel, which was heated at a fmith's forge, pro- 
duced ii 7 cubicle inches, that is, 234 times 
its bulk of Air, which did not begin to 
rife till the white fumes arofe 5 but then 
rulhed forth in great abundance, and in good 
plenty, alfo with the foetid oil which came 
laft. The remaining calx was two thirds 
black, the reft afh-coloured 5 it weighed 128 
grains, fo it was not half wafted, whence 
there muft remain much fulphur in it $ the 
weight of water to Air, being nearly as 8 8 5 
to one, as Mr. Hawksbee found it, by an 
accurate Experiment. A cubick inch of 
Air will weigh f of a grain, whence the 
weight of Air in the horn was 3 3 grains, 
that is, near i part of the whole horn. 
We may obferve in this, as alfo in the 
preceding Experiment, and many of the 
following ones, that the particles of new 
Air were detached from the blood and 
horn, at the fame time with the white fumes, 
which conftitute the volatile fait : But this 
volatile fait, which mounts with great acti- 
vity in the Air^ is fo far from generating 
true elaftick Air, that on the contrary it 
abforbs it, as I found by the following Ex- 
periment* 
Exp e-' 
