[ 1 57 ] 
the fixed air, and the other in the common air, and 
obferved that the former was coagulated much fooner 
than the latter. This I could wifh to have tried 
again. 
Infeds and animals which breathe very little are 
ftified in fixed air, but are not foon quite killed in 
it. Butterflies, and flies of other kinds, will gene- 
rally become torpid, and feemingly dead, after being 
held a few minutes over the fermenting liquor; but 
they revive again after being brought into the frefh 
air. But there are very great varieties with refped 
to the time in which different kinds of flies will 
either become torpid in the fixed air, or die in if. 
A large ffrong frog was much fwelled, and feemed 
to be nearly dead, after being held about fix minutes 
over the fermenting liquor ; but it recovered upon 
being brought into the common air. A fnail 
treated in the fame manner died prefently. 
Fixed air is prefently fatal to vegetable life. At 
leaff fprigs of mint, growing in water, and placed 
over the fermenting liquor, will often become quite 
dead in one day, or even in a lefs fpace of time ; 
nor do they recover when they are afterwards 
brought into the common air. I am told, ; however, 
that Tome other plants are much more hardy in this 
refped. 
A red rofe, frefli gathered, loft its rednefs, and be- 
came of a purple colour, after being held over the 
fermenting liquor about twenty-four hours ; but the 
tips of each leaf were much more affeded than the 
reft of it. Another red rofe turned perfectly white 
in this fituation ; but various other flowers, of differ- 
ent colours, were very little affeded, Thefe expe- 
riments 
