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179 ESSAYS anp OBSERVATIONS © 
thermometer immerfed in the liquor, but 
feparately and at different times, were fet 
under the receiver. With regard to the 
different fluids, the p/ezomena were much 
the fame. Upon exhaufting the receiver, 
the fluid gave out a great quantity of e- 
laftic air; and, while this happened, the 
mercury in the immerfed thermometer 
funk very faft and to-a great length. In 
our trials,it generally funk below the fcale 
applied, fo that we could not meafure ex- 
actly how far. In one experiment, before 
exhaufting the receiver, the thermometer 
had flood at 50 degrees, and, after exhauft- 
ing, we could judge very certainly that it 
funk tobelow 20. In another experiment 
made with the nitrous aether, when the’ 
heat of the air was about ¢3 degrees, we 
fet the vefft] containing the aether in ano~ 
ther a little larger containing water. Up- 
on exhaufting the receiver, and the veflel’s: 
remaining for a few minutes iz vacuo, we 
found the moft part of the water. frozen,. 
and the veflel containing the aether fur- 
rounded with a thick and firm cruft of 
ice. 
Secu 
