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XXVI. Some Remarks on the EffeBs of the 
late Cold in February I aft : in a Letter 
from the Rev. R. Watfon, Fellow ^Tri- 
nity College, and Profejfor of Chemiftry 
at Cambridge, to Mathew Maty, M,D» 
Sec, R, S, 
Dear Sir^ 
Trin^ Col!. Cam. March 21, 1771. 
Read April II, 3 Sf the 1 2th of laft February, about 
an hour after fun rifing,. I obferved 
at Cambridge a degree of cold which is very un- 
ufual in England, though common enough in more 
northern climates. Fahrenheit’s thermometer, made 
by Dollond, as well in the open air, as when covered 
withfnow, flood as low as 6° above o. The Cam, 
by no means a rapid river, remained unfrozen j at 
the tides indeed there was a little ice, and fome 
fmall flakes floating in the middle. This is no very 
uncommon phaenomenon. The Seine was not frozen 
at Paris in 1709, though the cold continued for two 
days one degree greater than in the prefent cafe. 
Various reafons have been produced, in order to ac- 
count for this feemins: deviation from the ufual 
ccuj*fe. of nature.. It hath, been generally believed 
that. 
i 
