[ *8i ] 
In a mixture containing JLor— of air from fu- 
9t 
gar, the reft common air, the candle went out imme- 
diately. When the receiver was filled with common 
air only, the fame candle burnt 72". 
The receiver was the fame as that ufed in the for- 
mer experiment of this kind, and the experiment 
tried in the fame way, except that the air from fugar 
was firft received in an empty bladder, and thence 
transferred into the inverted bottles of water, in which 
it was meafured : for the air is produced from the 
fugar fo flowly, that, if it had been received in the 
inverted bottles immediately, it would have been 
abforbed almoft as faft as it was generated. 
It appears from thefe experiments, that the air 
produced from fugar by fermentation, and in all pro- 
bability that from all the other fweet juices of vege- 
tables, is of the fame kind as that produced from 
marble by folution in acids, or at leaft does not 
differ more from it than the different parts of that 
air do from each other, and may therefore juftly be 
called fixed air. I now proceed to the air generated 
by putrefying animal fubftances. 
Experiment VI. 
The air produced from gravy broth by putrefaction, 
was forced into an inverted bottle of fope leys, in the 
fame way as in the former experiment. The quan- 
tity of broth ufed, was 7640 grains, and was found, 
by evaporating fome of the fame to the confidence 
of a dry extract, to contain 163 grains of folid 
matter. The fermenting bottle was immerfed in 
water kept conftantly to the heat of about 96". In 
about 
