I 43* 1 
XXVI. An Account of a mojl extraordinary Degree of 
Cold at Glafgow in January loft', together with fonts 
new Experiments and Obfervations on the comparative 
Temperature of Hoar-frojl and the Air near to it, made 
-at the Macfarlane Obfervatory belonging to the College . 
In a Letter from Patrick Wilfon, M. A. to the Rev, 
Nevil Mafkelyne, D. D. F. R. S. and AJlronomer 
Royal 
&ead April 20, i 
S I 1U 
Glafgow College* 
Feb. Z7, 1780. 
f | 'HE obfervations and experiments related in {be 
fequel were made here during the great froft in 
the courfe of laft month. I fhall be extremely happy if 
they contribute any thing to your entertainment, being 
induced to fend you the account in confequence of your 
having on a former occafion fo politely invited me to a 
further correfpondence. If the paper fhall appear to 
Vol. LXX. O 0 o you 
