The means were—
At 21 stations of greater elevation than Dorjiling 1°=348 ft.
At 17 stations lower in elevation 1°=447 ft.

VI.—Sixty-four contemporaneous observations at Jillapahar, 7,430 feet, and the bed of the Great Rungeet river, 818 feet; taken in January and February, give 1°=322 feet.

VII.—Observations taken by burying a thermometer two and a half to three feet deep, in a brass tube, at Dorjiling and at various elevations near that station.

MonthUpper StationsLower Stations
February and March
February
April
April
March and April
March, April, May		Jillapahar, 7,430 ft.
Ditto
Leebong, 6000 ft.
Jillapahar, 7,430 ft.
Khersiong, 4,813 ft.
Jillapahar, 7,430 ft.		Leebong, 6000 ft.
Guard House,
Great Rungeet, 1,864 ft.
Ditto
Khersiong, 4,813 ft.
Punkabaree, 1,850 ft.
Ditto		1°=269 ft.
1°=298 ft.
1°=297 ft.
1°=297 ft.
1°=223 ft.
1°=253 ft.
Mean1°=273 ft.

The above results would seem to indicate that up to an elevation of 7,500 feet, the temperature diminishes rather more than 1° Fahr. for every 300 feet of ascent or thereabouts; that this decrement is much leas in the summer than in the winter months; and I may add that it is less by day than by night. There is much discrepancy between the results obtained at greater or less elevations than 7000 feet; but a careful study of these, which I have arranged in every possible way, leads me to the conclusion that the proportion map be roughly indicated thus:—

1°=300 feet, for elevations from 1,000 to 8,000 feet.
1°=320 feet, for elevations from 8,000 to 10,000 feet.
1°=350 feet, for elevations from 10,000 to 14,000 feet.
1°=400 feet, for elevations from 14,000 to 18,000 feet.

VIII.—Khasia mountain observations.

DateCalcutta
Obs.		Number
of
Obs.		Churra
Obs.		Number
of
Obs.		 Altitude
above
the Sea
Churra Poonji, June 13 to 26
Churra Poonji, Aug. 7 to Sept. 4
Churra Poonji, Oct. 29 to Nov. 16		86·3
84·6
80·7		 63
196
85		70·1
69·2
63·1		 67
214
133		1°=300 ft.
1°=331 ft.
1°=282 ft.		4,069 ft.
4,225 ft.
4,225 ft.
354 414Mean, 304 ft.

DateCalcutta
Obs.		Number
of
Obs.		Khasia
Obs.		Number
of
Obs.		 Altitude
above
the Sea
Kala-panee, June, Aug., Sept.
Moflong, June, July, Aug., Oct.
Syong
Myrung, Aug.
Myrung, Oct.
Nunklow
Mooshye, Sept. 23
Pomrang, Sept. 23
Amwee, Sept. 23
Joowy, Sept. 23		85·5
85·9
85·1
89·1
82·9
86·4
78·5
82·7
79·9
79·5		35
73
4
42
21
139
9
51
15
11		67·4
68·8
65·0
69·7
63·2
70·9
66·3
65·8
67·1
69·0		35
74
6
41
58
139
12
51
11
7		1°=345 ft.
1°=373 ft.
1°=332 ft.
1°=343 ft.
1°=336 ft.
1°=372 ft.
1°=499 ft.
1°=369 ft.
1°=396 ft.
1°=567 ft.		5,302 ft.
6,062 ft.
5,734 ft.
5,632 ft.
5,632 ft.
4,688 ft.
4,863 ft.
5,143 ft.
4,105 ft.
4,387 ft.
400 4341°=385 ft.