4 r 4 Dr. Priestley’s Experiments relating to Phlogifton , 
former experiments, but more efpecially in thefe. By no other 
means can heat be given to fubftances in vacuo , or in any other 
kind of air befides atmofpherical ; and without fome method of 
doing this, no iuch experiments as thefe can poflibJy be made. 
I therefore congratulate all the lovers of fcience on the fucceff- 
ful attempt of Mr. Parker to execute fo capital an inftrument 
as lie has done of this kind. Such fpirited and generous exer- 
tions reflect honour on himfelf and on our country. It is only 
to be wifhed, that we could have lenfes of a fmaller fize (viz. 
from 12 to i 3 inches diameter) made tolerably cheap, fo that 
they might be in more common ufe. All my experiments 
were made with one of 12 inches in diameter..' 
Experiments relating to the feeming Converjion of Water into Aim 
SINCE manyperfons have exp refled a with to be acquainted 
with the experiments I have lately made, which at frffc leemed 
to favour the idea of a converjion of water into air , but which 
terminated in the difeovery of a fa ft, in my opinion, ftill more 
extraordinary, I fhall fubmit to the Royal Society the refult of 
the obfervations I have already made ; though, as yet, I have 
by no means been able to fatisfy myfelf fo fully as I could wilh 
with refpeft to fome particulars connected with the fubjeft. All 
the fatts which I fhall Rate may be depended upon ; but it is 
probable, that different perfons may draw different conclujions 
2 from 
