ihe Point of Mercurial Congelation . *369 
the obfervation uncertain ; but I did not obferve it differed 
any thing of confequence from (G) which was not taken in, 
but put direaiy into the phial. By the comparative obferva- 
tion s of the feveral thermometers it appears, that 30° on the 
fcale of the fpirit thermometers (D) and (£) i s about equal to 
4 °° °r 41 ° on my ftandard fpirit thermometer (H). The fol- 
lowing was the hate of the inftrupients that morning, 
A. 
B. 
D. 
E. 
F. 
G. 
H. 
At eight 
" 103 
-80 
33 i 
33 
42I 
42 
46 
At nine 
~ 3 2 3 
-444 
-29 
-29I 
-40 
-40 
-44 
At noon 
34 
3 2 
21 
2I| 
30 
29! 
34 
It may be worth remarking, that the quickfilver in the ther- 
mometer (B) which had been very near 500°, and was then at 
444 0 , very readily run up and down the tube by elevating 
either end of the inffrument. 
) 
E X P L A- 
