ip4 Analyfis of the Air, 
Experiment LXXIX. 
I put into the fame retort half a cubick 
inch of Mercury y affixing to the' retort a very 
capacious receiver, which had no hole in 
the bottom. The wide mouth of the recei- 
ver was adapted to the fmall neck of the 
retort (which was made of a musket barrel) 
by means of two large pieces of cork which 
entered and filled the mouth of the receiver, 
they having holes bored in them of a fit fize 
for the neck of the retort 5 and the junc- 
ture was farther fecured, by a dry fupple 
bladder tycd over it : For I purpofely avoided 
making ufe of any moift lute, and took 
care to wipe the infide of the receiver very 
dry with a warm cloth. 
The Mercury made a great ebullition, and 
came fome of it over into the receiver, as 
foon as the retort had a red heat given it, 
which was increafed to a white and almoft 
melting heat, in which ftate it continued 
for half an hour. During which time, I fre- 
quently cohobated fbme part of the Mer- 
cury y which condenfed, and was lodged on 
an horizontal level, about the middle of 
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