Experiments on Cold. 3 s ? 
On Thurfday, January 25, the difference of temperature 
was found to be as here let down. 
Thu rfday mo rnin g. 
Thermometer 
Thermometer 
h. m. 
in air. 
in fnow. 
9 4 j 
4 10 
4 3 
10 
- 
4 I C) 
JU 
* 
M 
O 
Co 
0 
4 14 
* 
4 4 
1 1 
- 
4 14 . 
- 
!4 S 
11 30 
- 
+ 17 
<& 
4 9 
I 2 
«*! 
4 20 
T 
4 12 
12 30 
- 
4 22 
- 
4 20 
i afternoon. 
4 25 
4 26 
1 30 
427 
- 
427 
From t:en till eleven o’clock this forenoon the thermometer 
on the baluftrade in air, fix inches above the fnow, pointed to 
+ 14, and when tried upon the fnow to +10. About noon 
this day fome clouds were formed, which became quite general 
by one o’clock. 
During the two laid times of obferving, three experiments 
were made with a view of difcovering whether the fnow with- 
out doors was gaining any thing from the air ; or if any of it 
was carried off in the way of evaporation ? For this purpofe, 
a fh allow difh, made of fheet brafs, four inches in diameter, 
was exactly filled with fnow, and carefully weighed. In order 
to defend the outfide of the difh. from the air, that no hoar- 
froft might attach itfelf to the metal, a circular hole was cut 
in the lid of a pafte-board box, fo wide as juft to let in the difli 
Vol, LXXL ' F f f to 
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