1 7 4 Analyjis of the Air. 



the iron retort, made of a musket barrel, 

 which was heated at a fmith's forge, pro- 

 duced nj cubick inches, that is, 234 times 

 its bulk of Air, which did not begin to rife 

 till the white fumes arofe -, but then ruihed 

 forth in great abundance, and in good plenty, 

 alfo with the fetid oil which came laft. The 

 remaining calx was two thirds black, the reft 

 afh-coloured; it weighed 128 grains, fo it 

 was not half wafted, whence there muft re- 

 main much fulphur in it ; the weight of water 

 to Air being nearly as 885 to one, as Mr. 

 Hawksbee found it, by an accurate Experi- 

 ment. A cubick inch of Air will weigh j of 

 a grain* whence the weight of air in the horn 

 was 33 grains, that is, near \ part of the 

 whole horn. 



We may obferve in this, as alfo in the pre- 

 ceding Experiment, and many of the follow- 

 ing one?, that the particles of new Air were 

 detached from the blood and horn, at the 

 fame time with the white fumes, which con- 

 ftitute the volatile fait: But this volatile fait, 

 which mounts with great activity in the Air, 

 is fo far from generating true elaftick Air, that 

 on the contrary it abforbs it, as I found by the 

 following Experiment. 



Expe- 



