2 2 6 Anal-yfts of the Air. 



guiflied it. The expanfion caufed by the 

 burning Nitre, was equal to more than two 

 quarts : When all was cool, there was near 

 So cubick inches of new generated air, which 

 aroie from a fmall quantity of detonized Ni- 

 tre ; but the elafticity of this new air daily 

 decreafed, in the fame manner as Mr. Haukf- 

 bee obferved the air of fired Gunpowder to 

 do, Thyjico-mechanical Exjier. />. 3 3 . fo that 

 he found 19 of 20 parts occupied by this 

 air to be deferted in 1 8 days, and its fpace 

 filled by the afcending water 3 at which fixa- 

 tion it reded, continuing there for 8 days 

 without alteration : And in like manner, I 

 found that a considerable part of the air, 

 which was produced by fire in the diftil- 

 lat-ion of feveral llibftances, did gradually 

 lofe its elafticity in a few days after the 

 diftillation was over ; but it was not fo 

 when I diftilled air thro' water, as in Expe- 

 riment 77. (Fig. 38.) 



Experiment OIL 



I placed on the fame pedeftal large Matches 



made of linen rags dipped in melted Brim- 



Jtone : The capacity of the vcflel, (Fig. 35.) 



above 



