1 7 8 Ana lyfis of the Air. 



Experiment LV1II. 



There were raifed from an ounce, or 437 

 grains of Muftard-feed, 270 cubicle inches 

 of air, or yj grains; which is fomething 

 more than £ part of the ounce weight. 

 There was doubtlefs much more air in the 

 feed ; but it rofe in an unelaftick ftate, be- 

 ing not difentangled from the Oil, which 

 was in fuch plenty within the gun-barrel, 

 that when I heated the whole barrel red hot, 

 in order to burn it our, it flamed vigoroufly 

 out at the mouth of the barrel. Oil alfo 

 adhered to the infide of the barrel, in the 

 diftillation of many of the other animal, 

 vegetable, and mineral fubftances ; fo that 

 the elaftick air which I meafured in the re- 

 ceiver, was not all the air contained in the 

 feveral diftill'd fubftances; fome remaining 

 in the Oil, for* there is unelaftick air in Oil, 

 part being alfo reforbed by the fulphureous 

 fumes in the receiver. 



Experiment LIX. 



From half a cubick inch of Amber, or 

 135 grains, were raifed 135 cubick inches 

 of air, or 38 grains, viz. jjj part of its 

 weight. E x p e- 



