Chemistry^ 443 
the parallels of 74" and 75" of north Latitude. The thermo- 
meter was placed in the shade on shipboard. 
Months. 
Max, 
Min, 
Mean. 
Fahr. 
Fahr. 
Fahr. 
1819, September, 
+ 37° 
— r 
+ 22°. 54 
October, 
+ 17.5 
— 28 
— 3.46 
November, 
+ 6 
— 47 
— 20.60 
December, 
+ 6 
— 43 
— 21,79 
1820, January, 
— $ 
— 47 
— 30.09 
February, 
— 17 
— 50 
— 32.19 
March, 
+ 6 
— 40 
— 18.10 
April, 
+ 32 
— 32 
— 8.37 
May, 
+ 47 
— 4 
+ 16.66 
June, 
+ 51 
+ 28 
+ 36.24 
July, 
+ 60 
+ 32 
+ 42.41 
August, 
+ 45 
+ 22 
+ 32.68 
Annual Temperature, 
+ 1°.33 
During the time that Captain Parry was in Winter Har- 
bour, it was always found that the thermometer on board stood 
from 2° to 5° higher than the one on shore, in consequence of 
the warmth created by the fires, &c. The minimum tempera- 
ture for February was — 50° on board, but — 55° on the ice. 
On the 14th and 15 of February, the thermometer was at 
— 54° upon the ice for seventeen hours. The mean annual 
temperature may therefore be fairly considered as 1° or ^° below 
zero.” — See Captain Parry’s Work, and the Transactions of the 
Royal Society of Edinburgh, vol. ix. p. SI 4. 
II. chemistry. 
S7. M. Grotthus’'s Method of Freezing Water in vacuo the 
same as Nairne'^s. — M. Orotthus has just published, in the An-^ 
nates Generates des Sciences Physiques, by M. VanMons, &c. &c. 
the following account of a New Method of Freezing Water in 
vacuo, which is said to be an improvement on the method given 
by Mr Leslie : — “ Into a metal vase, half filled with water, I 
poured, very gently, an equal quantity of ether, so that no mix- 
ture might take place of the two liquids. The vase was placed 
under the receiver of an air-pump, which was so fixed upon its 
support, as to remain quite steady when the air was pumped 
out. At the first stroke of the piston, the ether became in a 
state of ebullition. It was totally evaporated in less than a 'mi- 
