1 30 Analyfis of the Air. 
Socubick inches of new generated air, which 
arofe from a fmail quantity of detonized 
Nitre 5 but the elafticity of this new air dai- 
ly decreafed, in the fame manner as Mr. 
Hauksbee obferved the air of fired Gun- 
powder to do, c Phy(ico-mechanical Exper . 
p. S3, fo that he found 1 9 of 20 parts occu- 
pied by this air to be delerted in 18 days, 
and its fpace filled by the afcending water? 
at which ftation it refted, 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 
diftillation of feveral fubftances, did gra- 
dually lofe its elafticity in a few days after 
the diftillation was over? but it was not fo 
when I diftifed air thro' water, as in Expe- 
riment 77. (Eig. 3 8.) 
Experiment OIL 
I placed on the fame pedeftal larg ^Matches 
made of linen rags dipped in melted Brim- 
fione : The capacity of the veflel, (Fig, 35.) 
above z z the furface of the water, was 
equal to 2024 cubick inches. The quantity 
of air which was abforbed by the burning 
Match was 198 cubick inches, equal to tV 
part of the whole air in the veflel. 
I made 
