Ana^fis of the Air. z 1 3 
fpirits; for by Experiment 75, they r.bforb 
aiiv which air particles regained their elafti- 
city, when the acid fpirits which adhered to 
them were more ftrongly attraded by the 
gold, than by the air particles. 
Experiment XCI. 
A quarter of a cubick inch of Antimony ^ 
and two cubick inches of Aqua-regia^ gene- 
rated 3 8 cubick inches of air, the firft 3 or 
4 hours, and then abforbed 14 cubick in- 
ches in an hour or two 5 after which it was 
ftationary , till I let into the glafs vcffel a y 
(Fig. 34.) about a quart of frefh air : Upon 
which it abforbed fo faft, as to make the 
water rife very vifibly in a whereby it ab- 
forbed 30 cubick inches more. It is very ob- 
fervable, that air was generated while the 
ferment was fmall, on the firft mixing of the 
ingredients: But when the ferment was 
greatly increafed, fo that the fumes rofe 
very vifibly, then there was a change made 
from a generating to an abforbing ftate 5 that 
is, there was more air abforbed than gene- 
rated. 
P S 
That 
