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Analyfis of the Air. 
Experiment LX. 
From 142 grains of dry Tobacco was raifed 
153 cubick inches of air, which is little 
lefs than \ of the whole weight of the To- 
bacco i yet it was not all burnt, part being 
out of the reach of the fire. 
Experiment LXL 
Camphire is a mtfft volatile fulphureous 
fubftance fublimed from the Rofin of a tree 
in the Eafl-Indies. A dram of it melted 
into a clear liquor, at fome diftancc from 
the fire, and fublimed in the form of white 
cryftals, a little above the liquor, it made 
a very finall expanfion, and neither gene- 
rated nor abforbed air. The fame Mr. Boyle 
found, when he burnt it in vacuo, Vol. IL 
^.605. 
I Experiment LXIL 
From about a cubick inch of chymical 
Oil of An fed, I obtained 22 cubick inches 
of air 5 and from a like quantity of Oil of 
Olives, 88 cubick inches of air. The re a? 
fon of which difference was, as X fuppofe, 
this, viz. finding that the Oil of Anifeed 
came plentifully over into the receiver, in 
N % the 
