It 6 Analyfts of the Air, 
guifhed it. The expanfion caufed by the 
burning Nitre, was equal to more than two 
quarts : When all was cool, there was near 
So CLibick inches of new generated air, which 
arofe from a finall quantity of detonized Ni- 
tre 5 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^ Thyjtco-mechanical Exper, fo that 
he found 19 of 20 parts occupied by this 
air to be deferred in 18 days, and its fpace 
filled by the afeending water j at wJiich fta- 
tion it refled, continuing there for 8 days 
without alteration : And in like manner, I 
found that a confiderable part of the air, 
which was produced by fire in the diftih 
lation of fevcral fubftances, did gradually 
lofe its elafticity in a few days after the 
diftillation was over 5 but it was not fo 
when I diftillcd air thro* water, as in Expe- 
riment 77. ( Fig. 3 8. ) 
Experiment CIII. 
I placed on the fame pedeftal hvgc Matches 
made of linen rags dipped in melted Brim- 
flone : The capacity ot the vcflel, (Fig. 35.) 
above 
