i6^ Analyfts of the Air. 
weight of water to Air, being nearly as 
885 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 33 grains, 
that is, near 7 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 fair, which mounts with great a£li- 
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. 
Experiment LIT. 
A dram of njolatile fait of fal armoniackj 
foon diftilled over with a gentle heat j but 
tho' the expanfion in the receiver was dou- 
ble that of heated Ah* alone, yet no Air 
was generated, but two and an half cubick 
inches were abforbed. 
Expe- 
