*3 5 4 Mr. H ut cm ns’s Experiments for afcertaining 
were taken, the inflruments all expofed to the open air, 
where they are continually kept. The thermometers are' 
marked from (A) to (H), and the observations are regularly in 
that 
order. 
h. 
/ / 
A 
B 
C 
D 
E 
F 
G 
H 
; 7 
45 
44 § 
45 
4 i 
28 
29 * 
40 
40 
46 
7 
5 ° 
46 
64 
1 24 
3 ° 
3 2 
42 
41 
46 
7 
55 
— 
— 
60 
— 
— 
— 
— 
— 
7 
57 
44 
— 
— 
— 
— 
— 
— 
— 
It 
is obfervable, 
that 
neither 
the 
quickfilver 
which 
was 
the cylinders affixed to (F) and (G), nor the other quickfilver 
which I conflantly kept in the fame place, fome in a faucer, 
fome in a gallipot, and fome in a phial, fhewed the lead: ap- 
pearance of congelation. Being engaged in preparing for the 
enfuing experiment, I did not remark either the great defcentor 
afcent of the quickfilver in (C), which mud: have been very 
iudden, as my remarks are only five minutes afunder. 
It may be neceflary to mention, that the thermometer fH) 
was mounted on a fcale the whole length (as ufual for meteoro- 
logical obfervations), and (C) was armed with elafbic gum from 
the bulb to about half or three-quarters of an inch above the 
furface of the freezing mixture. 
The finall defcent of the quickfilver in (C), and the little effe£t 
produced by moving it into a fecond mixture, made me at firfl 
apprehend the infbrument was damaged ; I did not, however, 
take it out, but took another thermometer (A), and put it alfoin 
the mixture; but 1 find it was fbationary at a higher degree than 
(C) : 1 therefore exchanged (A) for the mercurial thermometer 
(B), which to my great furprize was fbationary at 86°, nor could 
it be got lower until the cold of the mixture diminifhing it fell 
at 
