In the following observations solitary readings are always rejected.
I.—Summer or Rainy Season observations at Dorjiling.
Observations taken during the rainy season of 1848, at Mr. Hodgson's (Jillapahar, Dorjiling) alt. 7,430 feet, exposure free to the north east and west, the slopes all round covered with heavy timber; much mist hence hangs over the station. The mean temperatures of the month at Jillapahar are deduced from horary observations, and those of Calcutta from the mean of the daily maximum and minimum.
No. of Obs. Temp. Equiv. of Month at Jillapahar Temp. Calcutta 1 degree F. ——————————————————————————————- July 284 61.7 86.6 364 feet August 378 61.7 85.7 346 feet September 407 58.9 84.7 348 feet October 255 55.3 83.3 316 feet ——————————————————————————————- 1,324 Mean 344 feet
IL—Winter or dry season obaervatians at Dorjiling.
1. Observations taken at Mr. J. Muller's, and chiefly
by himself, at "the Dale;" elev. 6,956 feet; a
sheltered spot, with no forest near, and a free
west exposure. 103 observations. Months: November,
December, January, and February 1 degree=313 ft.
2. Observations at Dr. Campbell's (Superintendent's)
house in April; elev. 6,950 feet; similar exposure
to the last. 13 observations in April 1 degree=308 ft.
3. Observations by Mr. Muller at Colinton; elev. 7,179
feet; free exposure to north-west; much forest about
the station, and a high ridge to east and south.
38 observations in winter months 1 degree=290 ft.
4. Miscellaneous (11) observations at Leebong;
elev. 6000 feet; in February; free exposure all
round 1 degree=266 ft.
5. Miscellaneous observations at "Smith's Hotel;"
Dorjiling, on a cleared ridge; exposed all round;
elev. 6,863 feet. April and May 1 degree=252 ft.
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Mean of winter observations 1 degree=286 ft.
Mean of summer observations 1 degree=344 ft.
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Mean 310 ft.
III.—Miscellaneous observations taken at different places in Dorjiling, elevations 6,900 to 7,400 feet, with the differences of temperature between Calcutta and Dorjiling.
Number Difference Equivalent
Month of Observ. of Temperature 1 degree F.=
——————————————————————————————-
January 27 30.4 287 ft.
February 84 32.8 265
March 37 41.9 196
April 7 36.0 236
March and April 29 37.3 224
July 83 23.6 389
August 74 22.4 415
September 95 25.7 350
October 18 29.5 297
——————————————————————————————-
Sum 454 Mean 31.1 Mean 296 ft.
These, it will be seen, give a result which approximates to that of the sets I and II. Being deduced from observations at different exposures, the effects of these may be supposed to be eliminated. It is to be observed that the probable results of the addition of November and December's observations, would be balanced by those of May and June, which are hot moist months.
IV.—Miscellaneous cold weather observations made at various elevations between 1000 and 17,000 feet, during my journey into east Nepal and Sikkim, in November to January 1848 and 1849. The equivalent to 1 degree Fahr. was deduced from the mean of all the observations at each station, and these being arranged in sets corresponding to their elevations, gave the following results.