the Point of Mercurial Congelation. *357 
9 h* 53 ’ w ^ en it was taken out of the mixture perfectly folid. At 
ioh 6 i faw it had lubfided into the bulb (I mean the quickfilver 
in the inclofed thermometer) which was the lafl time I parti- 
cularly noticed it. It may be neceffary to mention, that find- 
ing the quickfilver in the enclofed thermometer link inflan- 
taneoufly as foon as the apparatus was put into the freezing 
mixture, I took it out immediately, to view it, and replaced it 
in a few feconds of time. I found the quickfilver was not 
yet folid, but was in frozen pieces of irregular fhapes, refem- 
bling ice that had been broken to pieces by concuffion in a pail 
of water, but with this remarkable difference, that as ice fwims 
on the water, the frozen quickfilver fubfided in fluid quickfilver, 
and the fegment of ice, mentioned a little before to be found 
in the thermometer (F) was alfo at the bottom of the cylinder, 
and remained there after decanting the liquid quickfilver from 
it. Hence we may conclude, that cold increafes the, gravity 
of quickfilver, as indeed muff be the cafe, fmee it is certain it 
occupies lefs fpace in a folid than in a fluid flate. 
I 
Experiment 1 
