[ 148 } • 
With one part of inflammable air toqof common 
air, the mixture would not take fire, on applying the 
lighted paper to the mouth of the bottle ; but, on 
putting it down into the belly of the bottle, the air 
took fire, but made very little found. 
With 2 parts of inflammable to 8 of common air,, 
it took fire immediately, on applying the flame to the 
mouth of the bottle, and went off with a moderately 
loud noife. 
With 3 parts of inflammable air to 7 of common 
air, there was a very loud noife. 
With 4 parts of inflammable to 6 of common air, 
the found feemed very little louder. 
With equal quantities of inflammable and common 
air, the found feemed much the fame. In the firft of 
thefe trials, namely, that with one part of inflammable 
to 9 of common air, the mixture did not take fire all 
at once, on putting the lighted paper into the bottle ; 
but one might perceive the flame to fpread gradually 
through the bottle. In the three next trials, though they 
made an explofion, yet I could not perceive any light 
within the bottle. In all probability, the flame fpread 
fo inftantly through the bottle, and was fo foon over, 
that it had not time to make any impreflion on my 
eye. In the Jaft mentioned trial, namely, that with 
equal quantities of inflammable and common air, a 
light was feen in the bottle, but which quickly 
ceafed. 
With 6 parts of inflammable to 4 of common air, 
the found was not very loud : the mixture continued 
burning a fhort time in the bottle, after the found was 
over. 
With 
