Mr. Cavenpisn’s Experiments on Air. 124 
was repeated'feveral times with different ‘proportions of ¢om- 
mon and inflammable air, I could: never perceive a lofs of . 
weight of moré than one-fifth of a grain, and’ commonly 
none at all. It muft be obferved, however, that though ‘there 
svere fome of thé experiments in which it feemed’to diminith . 
a little in weight,. there were none in which it increafed *, * 
In all the experiments, the infide of the glafs:elobe became | 
dewy, as obferved’ by Mri War itire; but not the leaft footy 
matter could -be: perceived... Care was! takenin “all of them ‘ta 
find how much 'the*air was? diminifhed by the explofion, and — 
to obferve its teft.. The refultis as follows: the bulk of the - 
inflammable air being exprefied in decimals of the common : 
air, , tat 

Commen air.|Inflammable Diminution. Air remain- fTeft of, this} Standard. © 





aire: See ‘jing after-thelair’ in firft} © 
‘ey explofion. method. 
ic ale SAL CRN GR ale bie Et ind fale ol Sp ,0 
OW] pis W,05 PU) 31,6420. $l Iam it -jofsii 0 
~! ites Tay 5706) | 5047 i bont,.95a 5066 29 
ee Ee pa One Hh) Lon) | OOF AGIs 
Baa ls WAG ten, 855 1 4320. 927 
3206 7294 , i G12 ,048° 25 
' In thefe experiments the-inflammable air was procured from > 
zinc, \as it was in-all my experiments, except. where otherwife 
exprefled: but 1 made two more experiments,’ to try whether - 
there was. any difference between the air from zinc and that 
from iron, the quantity of inflammable air-being.the fame in. ; 
both, namely, 0,331 of the common; but I could not findany. | 
@ifférence tobe depended on between the, two kinds of air, 
~* Dr. PRiEsTLey, I am. informed, has fince found the experiment not: to 
fecceed, if LLY 
either - 
