85 
p.m. ; on February 7tli, showed no loss. 
„ 8th gain of 0*05. 
„ 9 th no loss. 
„ 10th evaporation of 0*50 mm. 
„ 12th „ 003. 
This very inconsiderable loss through the day time arises 
partly from the temperature of the ice changing but slowly. 
Condensation producing gain on the 8th is very instructive, 
and such circumstances must be taken into consideration in 
studying the climate when the glaciers had a greater extension. 
I also again filled a tin (painted white) with snow, and 
buried it as before in the snow so that the level of the 
snow in the tin was as near as possible the same as that 
surrounding it, and in this way we must find out very 
approximately the amount of evaporation from the surface 
of the snow covering the valley. It was placed in the sun 
and measured by weighing, and the weight lost is calculated 
out and expressed in the depth of water, which will mean, 
as we have seen, that at least three times this depth of snow 
has disappeared. 
The results were : — - 
Loss by evaporation — Temperature.— N Maximum, 
from 9 a.m. to 3 p.m. 9 a m. 1 p.m. 3 p.m. Solar radiation. 
Feb. 5th. — 0'07mm. (water)— 90C.— 3'8C.— 3*00. 37'4C. cloudless day, windy, 
moderately dry. 
>> 
23rd.— 0-60 
do. 
+ 3-4 
+ 2'0 
+ 2-0 
fairly clear, windy, 
very dry. 
27th. — 0*27 
do. 
-3-4 
+ 5-2 
+ 4-8 
43-6 
nearly cloudless, little 
wind, very dry. 
>5 
28th.— 0-48 
do. 
+ 2-0 
+ 2'6 
+ 2-9 
52-6 
rather cloudy, windy, 
moderately dry. 
Mar. 2nd. — 0'40 
do. 
-42 
-ri 
-3-4 
39-2 
very little cloud, 
windy, very dry. 
5th.— 0-35 
do. 
-87 
-0-8 
+ 0-6 
37-8 
cloudless, moderate 
wind,moderatelydry. 
Apr 
-. 2nd.— 0*27 
do. 
+ 2*1 
+ 3‘2 
+ 1*9 
51-6 
rather cloudy, windy, 
moist. 
3rd.— 0-33 
do. 
+ 1-3 
+ 57 
+ 6-4 
44-6 
cloudless, very little 
wind, dry. 
>> 
4th— 0-58 
do. 
+ 2-3 
+ 7-9 
+ 6-0 
47-8 
almost cloudless, little 
wind, dry. 
5 } 
5th.— 0'43 
do* 
+ 2-6 
+ 7*4 
+ 8”0 
44-8 
cloudless, not very 
windy, dry. 
