CHEMICAL AND PHYSICAL NOTES. 171 
4:6 mm., and the difference is only 1:4 mm. We see, however, 
that this has been sufficient to increase the absolute humidity of the 
air in close proximity to the ice. At 1m. above the ice the air had 
an average temperature of 10°C.; at 2 cm. from the ice its tempera- 
ture was as high as 6°°65 C., and the air in actual contact with the 
ice must have been at 0°C. Many observations have been made of 
TasLe XXIV.—TEMPERATURE OBSERVATIONS AT EQuaL ALTITUDES ON THE Morre- 
RATSCH GLACIER, AND ON THE Mountain WEST OF IT. 
Thermometer. 
Diff. Vapour Rel. Dew 
Dry. Wet. tension. hum. point. 
19th August, 1893. °C. °C. °C mm. p.c. °C 
Land station, 245 pm. . .| 17°1 8-6 8:5 3-2 22 —5°0 
$4 » 435 ,, - «| 16°0 8-1 79 3:2 24 4:7 
Mean. -| 16°55 8°35 8-2 3-2 23 4°85 
Tce station, 3.20 p.m. -| 9°8 4:7 5°2 3°26 36 -4 
Height 1 metre,3.55 ,, . .| 10°2 5:1 5:1 3°55 39 -3°5 
Mean . . .| 10:0 4:9 5:1 3°40 | 387°5 | —3°95 
Ice station, 3.20pm. . .| 6°7 3°7 3°0 4:2 57 -1-4 
Height 0°02m.3.55 , . .| 6°6 3:2 4-4 4:0 56 -3-0 
Mean . ‘ 6°65 | 3°45 3°72 cael 56°5 —2°2 
21st August, 1893. 
Land station, lpm. . .| 14°5 TS 7:0 3°5 29 —3°5 
oe jon 10240! 5 - .{ 14:3 8-0 6°3 4:2 35°0 | -1'3 
Mean. . «| «144 7:75 6°65 3°8 32 24 
ice station, 2.22pm... .; 9°85 576 4°25 4:2 47 —1:'3 
Height 1 metre,2°54 ,, . .} 11°0 7:0 4-0 5-1 52 +15 
Mean . . .| 10°48 6:3 4°13 4°6 50 +071 
Ice station, 215 pm... .| 7:3 4:0 3°38 4: 54 —1°5 
Close to ice, 240 , . . 5:5 3°2 2°3 4: 65 -0'7 
Mean . . .| 6'4 3°6 2°8 4°2 59 -11 
the temperature of the air at different heights above glaciers, and, as 
might be expected, considerable differences have been observed ; but 
I am not aware that any observations have been made on the air 
almost but not quite in contact with the ice, as are those which have 
been made at 2 cm. from the ice. The bulb was perfectly shaded 
from the sun but freely exposed to the wind, it was also fully ex- 
