the Point of Mercurial Congelation . 
Experiment VI. made January 1 1 , 1782. 
Time per 
Watch. 
Standard 
fpirit H. 
therm. C. 
Mercurial 
Spirit 
therm. D. 
Mercurial 
therm. B. 
Remarks and Occurrences. 
h * , „ 
2 13 ° 
38 
80 
26 
282 
2140 
3 S 
55 
26 
276. 
2 15 0 
38 
37 
26 
270 
216 0 
38 
45 
26 
262 
217 0 
38 
35 
26 
252 
> 
218 0 
38 
35 
26 
250 
2190 
37 f 1 
34 
26 
244 
Took out all the inflruments. 
This fingular experiment, though it did not anfvver the in- 
tention for which it was principally defgned, yet afforded 
many finking phenomena which I (hall mention in the courfe 
of thefe remarks. After a cold night, the quickfilver in the ther- 
mometer was at 44 0 below o at leven o’clock in the morning : 
thinking this great degree of cold was the mofl favourable op- 
portunity of obferving how low it was poflible to make the 
quickfilver defcend in the tube of the thermometers, I refolved 
to embrace it, and at the fame time to obferve the concurrent 
degrees with a lpirit thermometer; but as thofe fent out to 
me in 1781 (D and E) differed fo much from the thermometers 
of quickfilver, I refolved to make ufe of another fpirit thermo- 
meter made by nairne and blount, and which was alfo fur- 
nifhed me by the Royal Society in 1774. With this inftru- 
ment, which I call the flandard, and marked with the letter 
H, I have made obfervations eight years, and found it agree 
very well with others made of quickfilver ; and the more rea- 
dily to difcover the variation of (D), I employed it alfo in the 
fame experiment ; but before I began the following obfervations 
*A a a 2 were 
