332 Mr. Warr’s T boughts on the conflituent 

<6 tion im the airs, which was foon followed by the glafS.veflel 
<‘ becoming hot» The heat gradually pervaded the glafs, and 
<< was diflipated in the circumambient air, and as. the glafs 4 
<‘ orew cool, a mift or vifible vapour appeared in it, which 
‘¢ was condenfed on the glafs in the form of moiture or dew *. 
“¢ When the glafs was cooled to the temperature of the atmo= 
«¢ fphere, if the vetlel was opened with its mouth immerfed in 
«¢ water or mercury, fo much of thefe liquids entered, as was 
« fufficient to fill the glafs within about 2 dth part of its. 
«* whole contents; and cine {mall refiduum may fafely be con- 
“< cluded to have been occafioned by fome impurity in one op 
“© both kinds of air. ‘The moifture adhering to the glafs, after 
«‘ thefe deflagrations, being wiped off, or fucked up, by a 
<< {mall piece of fponge paper, firft carefully weighed, was. 
«« found to be exactly, or very nearly, equal: in weight to the 
<¢ airs employed.” 
‘© In fome experiments, but not im all, a fmall quantity of 
‘¢ a footy-like matter was found adhering to the infide cf the 
‘ olafs,” the origin of which is not yet inveftigated; but Dr. 
PrigesTLey thinks, that it arifes from fome minute grains of 
the mercury that was ufed in order to fill the glafs with the 
air, which being fuper-phlogifticated by the inflammable air; 
aflumed that appearance; but, from whatever caufe it pro- 
ceeded, ‘the whole quantity of footy-like matter was too 
* {mall to. be an obje& of confideration, particularly as it did 
<¢ not occur in all the experiments.” 
I am obliged to your friendfhip for the account of the expe= 
riments which have been lately made at Paris’on this fubject,, 
* TI believe that Mr. CAVENDIsH was the firft who. difcovered that the com- 
buftion of dephlogifticated and inflammable air produced moifture on the fides of 
the glafs in which they were fired,. 
with, 
