I 
464 Mr. wilson’s Account of a mojl 
9 o’clock at night, therm, 
on fnow pointed on 
•jj 
• + 5 
■ 
Therm, 
air to 
in' 
.+9 
• 
9 r 
+ 5 
-• 
+ 8 
10 
+ 6 
• 
+ 8 
io| 
+ 6 
+10 
n 
+ 6 
-© 
+ 9 
ii| 
+ 5 
+ 8 
12 
+ 5 
*> 
+ 8 
I 2| 
+ 4 
+ 7 
i o’clock Monday morning +4 
+ 8 
i-r 
+ 4 
• 
+ 8 
From thefe observations it appears, that the cold now 
was very moderate when compared to that of the 1 4th, 
and fomewhat more moderate than that of the preceding 
night. Experiment 7 th was again repeated with a fimi- 
lar refult, though the difference of temperature was not 
now fo great. 
This night I made another experiment with a view to 
. 
the evaporation, not fo liable to objections as thofe of the 
bellows and the fan. This fhall now be defcribed. 
EXPERIMENT IX. 
When the thermometer in air at the lower ftation 
had contracted a confiderable film of frozen matter all 
over 
