extraordinary Degree of Cold at Glafgow. 465 
ever the ball, it was fwung round at the end of a pack- 
thread, about a yard and a half long. Upon flopping the 
motion at the expiration of two minutes, and making 
the fervant who waited approach quickly with a lighted 
candle, I found the mercury had got up 2 0 . In this ex- 
periment, which was repeated four times with the fame 
refuit, care was always taken to keep the inftrument to 
windward of our bodies, and of the lighted candle.. 
This night the thermometer, when put under the 
fnow clofe to the ground,, pointed to + 1 8°.- Both now 
and on the preceding night there were no clouds, though 
the air, as on the 14th, was a little thick towards the 
horizon, and there was always a very perceptible and 
conftant motion of it from Eaft to Weft. On this and 
the preceding : night the Moon, a little paft the full, fhone 
very bright, and the mercury was ftationary at 30 inches. 
On Sunday, Feb. 13. .we had a flight froft accompa- 
nied with a thick fog. This oecafioned a vaft fettling of 
hoar-froft upon the fmall branches and twigs of trees, . 
and upon all thin and detached bodies expofed to the 
open air. The weather continued much in this ftate on 
Monday, when, at ten o’clock forenoon, I repeated the 
feventh experiment on the balluftrade, but now found 
no difference whatever in the temperature of the hoar- 
froft and the air in its neighbourhood. The thermome- 
s ter-' 
