166 Anahjfis of the Air. 



cc Air; and this Air by fermentation, and 

 ec fomctimes without it, returns into denfe 

 " bodies." Of the truth of which we have 

 evident proof from many of the following 

 Experiments, viz. 



That I might be well affured that no part 

 of the new Air which was produced in di- 

 ftillation of bodies, arofe either from the 

 greatly heated Air in the retorts, or from 

 the fubftance of the heated retorts, I firft 

 gave a red hot heat both to an empty glafs 

 retort, and alfo to an iron retort made of a 

 musket barrel ; when all was cold, I found 

 the Air took up no more room than be- 

 fore it was heated : whence I was affured, 

 that no Air arofe, either from the fubftance 

 of the retorts, or from the heated Air. 



As to aiftmal fidftances, a very confide- 

 nce quantity of permanent Air w 7 as pro- 

 duced by diftiliation, not only from the 

 blood and fat, but alfo from the mod folid 

 parts af animals. 



Experiment XLIX. 



A cubick inch of Hog's blood, diftilled to 

 dry fecria, produced thirty three cubick 



inches 



