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.
| Month | Number of Observations | Difference of Temperature | Equivalent |
| January February March April March and April July August September October | 27 84 37 7 29 83 74 95 18 | 30·4 32·8 41·9 36·0 37·3 23·6 22·4 25·7 29·5 | 1°=287 ft. 1°=265 ft. 1°=196 ft. 1°=236 ft. 1°=224 ft. 1°=389 ft. 1°=415 ft. 1°=350 ft. 1°=297 ft. |
| Sum 454 | Mean 31·1 | Mean 1°=295 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° 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.
| Elevation | Number of Stations | Number of Observations | Equivalent |
| 1,000 to
4,000 ft. 4,000 to 8,000 ft. 8,000 to 12,000 ft. 12,000 to 17,000 ft. | 27 52 20 14 | 111 197 84 54 | 1°=215 ft. 1°=315 ft. 1°=327 ft. 1°=377 ft. |
| Sum 113 | Sum 446 | Mean 1°=308 ft. |
The total number of comparative observations taken during that journey, amounted to 563, and the mean equivalent was 1°=303 feet, but I rejected many of the observations that were obviously unworthy of confidence.
V.—Miscellaneous observations (chiefly during the rainy season) taken during my journey into Sikkim and the frontier of Tibet, between May 2nd and December 25th, 1848. The observations were reduced as in the previous instance. The rains on this occasion were unusually protracted, and cannot be said to have ceased till mid-winter, which partly accounts for the very high temperatures.
| Elevation | Number of Stations | Number of Observations | Equivalent |
| 1,000 to
4,000 ft. 4,000 to 8,000 ft. 8,000 to 12,000 ft. 12,000 to 17,000 ft. | 10 21 18 29 | 45 283 343 219 | 1°=422 ft. 1°=336 ft. 1°=355 ft. 1°=417 ft. |
| Sum 78 | Sum 890 | Mean 1°=383 ft. |
The great elevation of the temperature in the lowest elevations is accounted for by the heating of the valleys wherein these observations were taken, and especially of the rocks on their floors. The increase with the elevation, of the three succeeding sets, arises from the fact that the loftier regions are far within the mountain region, and are less forest clad and more sunny than the outer Himalaya.
A considerable number of observations were taken during this journey at night, when none are recorded at Calcutta, but which are comparable with contemporaneous observations taken by Mr. Muller at Dorjiling. These being all taken during the three most rainy months, when the temperature varies but very little during the whole twenty-four hours, I expected satisfactory results, but they proved very irregular and anomalous.