Le Sh ee soles pea OU tal Ties 
sad tigi oie cue Sk etait 
3 ee 
toni, called Gas Syutfre, it fas 
been imagined by many, that dif- 
ferent vegetables contain althoft no= 
thing but fixed air, becatfe they faw 
that as ‘foon as they began to fer- 
iment they emitted really fixed air, 
But if from this we conclude that 
this very fame> vegetable confained 
this fixed air, as fuc h, concealed in 
its fubftance, and exifting there, as 
it were ina concentrated or. com- 
prefled ftate,. almoft as common air 
is: in a conden n ne before the 
fermentation ‘began, + we ray Fete 
bly make an erronéous concluGon ; 
for it may be that this vegetable did 
hot contain more fixed air as fuch 
tha/inflammable air; but that a 
part of the fubitance of the vege- 
tabléhas undergone fuch a change 
by the action of the fermentation 
aS to become what is now ca 
I fixed 
