*344 Mr. hutchins’s Experiments for afcertaining 
ing point of quickfilver ; but the arrival of a gentleman, who 
wifhed to fee it, induced me to repeat it again. The weather 
was clear and ferene, the wind about S.S.W., and the feveral 
thermometers flood as follows, A 82° B 66°, D 34 0 , E 34°, 
F 42 0 , G 42 0 , H 46°, at feven o’clock in the morning; and 
at eight o’clock they were A 78°, B 114 0 , D 29°!, E 29°! „ 
F 29°!, G 40°, H 43 0 ; yet it is remarkable, that quickfilver 
which was conftantly expofed to the air in a fancer was not 
froze. I impute the fmall defeent of the quickfilver in the ther- 
mometers to the great degree of the cold in the atmofphere as 
in the fixth experiment, for there the effect was fimilar. The 
mod: remarkable circumftance in this day’s operation was the 
fudden defeent of the quickfilver in the apparatus thermometer, 
and the length of time it continued at 79 0 before the quick- 
filver in the cylinder became folid. The freezing mixture re- 
taining an equal degree of cold for fo long a time (as appeared 
by the l'pirit thermometer), and the confequent flationary {itua- 
tion of all the inftruments, I apprehend, proceeded from the 
continual cold in the circum-ambient air ; for at one o’clock 
the thermometers were rilen but very little, being as follows, 
A 35°, B 32 0 , D 2 1 , E 22 0 , F 30°, G30 0 , H 34 0 , the wind 
blowing brifk from NAY. 
Experiment 
