the Point of Mercurial Congelation. 
Experiment II. made December 1 6, 1782. 
Time per 
Watch. 
f 
u 1 
l 
53 • 
Cl* 3 
Cl* ~ 
Spirit 
lermom. 
r £ I 
Remarks and Occurrences. 
h 
h - / „ 
11 7 40 
11 8 0 
11 8 20 
11 8 40 
11 9 15 
11 9 30 
11 15 0 
37 
37 
37 
37 
37 
37 
3 6 
47 
38 
38 
3.8 
371 
37 
35 
2 3 l 
2 3 
f Examined apparatus, quickfilver in the cylinder 
l perfe&ly fluid. 
This experiment was made with the fame inflruments as the 
preceding, and the quickfilver which was left yefferday in the 
cylinder was the fame now employed. I was rather unfortu- 
nate in making too fmall a quantity of the freezing mixture at 
the beginning, which obliged me to make repeated additions to 
it: by this means the operation was not only retarded, but 
fometimes it even undid what had been done ; for in pouring in 
the nitrous acid it was unavoidable but part of it fhould come in 
contaft with the bulbs of the inflruments before it was mixed 
with fnow. In this cafe it never failed making the thermome- 
ters rife fuddenly much higher than where they flood before 
the fpirit was added ; and at length it only defcended to 206°, 
which is not half fo low as on the preceding day, though the 
temperature of the air was ten degrees colder (viz. 34°) : yet it 
is remarkable, that though the thermometer was fo much 
higher, the apparatus was funk more than twice as low as the 
day before ; for after having been long flationary at 40°, it funk 
- Vol. LXXIII. *X x to 
