I 108 ] 
XVI. A Comparifon of different thermometri- 
cal Obfervations in Sibiria ; by Mr . Wra. 
Watfon, F. R. S. 
Read March 15, y* C CORDING to the thermome- 
I75j " X \ trical obfervations made by Monf. 
Demidoff, at Sclifkamsky, on the borders of Sibiria, 
latit. in the year 173:1, the greatefl degree of cold 
was upon Nov. p, at 7 in the morning, when the 
thermometer, according to Fahrenheit’s fcale flood 
at 34 degrees below o j which is 66 under the freez- 
ing point. This degree of cold, tho’ much greater 
than what is ever obferved in thefe parts, is little, 
when compared with the accounts given us by Pro- 
feffor Gmelin, in the introduction to the Flora Sibi - 
rica. This gentleman, who was profeflor of che- 
miflry and natural hiftory at Peterfburg, was fent 
with feveral other learned men, to inquire into the 
natural hiftory of Sibiria, and was attended by fome 
ftudents, a painter or two, a miner, and other proper 
attendants. He continued nine whole years upon this 
e>p dition, and the obfervations he made, extraordi- 
nary as fome of them are, with relation to their truth,, 
are fcarce to be doubted. The mercury in his ther- 
mometer, graduated according to De Lb lie's fcale, 
oft n funk in winter, in very fouthern parts of this 
country, as near Sclinga, in lat. 48, to near 226, 
which is equal to fy and a half below o in Fahren- 
heit’s thermometer, and is 87 and a half below his 
freezing point. Put the cold is often more intenfe 
than this, as appears by the experiments made at 
Kirenginfhi,, 
