[ »57 1 



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. 



Infects and animals which breathe very little are 

 ftifled 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 refpect 

 to the time in which different kinds of flies will 

 either become torpid in the fixed air, or die in it. 

 A large ftrong 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 

 ieaft 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 

 refpect. 



A red rofe, frefh 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 affected than the 

 reft of it. Another red rofe turned perfectly white 

 in this fiiuation; but various other flowers, of differ- 

 ent colours, were very little affected. Thefe expe- 

 riments 



