Oct. 1840. METEOROLOGICAL OBSERVATIONS. 153 



15,620 feet, and by carefully boiled thermometers, 15,283, 

 on the 13 th October, and 15,506 on the 15th : the differ- 

 ence being due to the higher temperature on the latter 

 clay, and to a rise of 0° 3 on both boiling-point thermometers 

 above what the same instruments stood at on the 13th. 

 The elevation of Tungu from the October barometrical 

 observations was only seven feet higher than that given by 

 those of July; the respective heights being 12,760 feet in 

 July, and 12,773 in October.* The mean temperature 

 had fallen from 50° in July to 41°, and that of the sunk 

 thermometer from 57° to 51° 4. The mean range in July 

 was 23° 3, and in October 13° 8 ; the weather during the 

 latter period being, however, uniformly cold and misty, this 

 was much below the mean monthly range, which probably 

 exceeds 30°. Much more rain fell in October at Tungu 

 than at Dorjiling, which is the opposite to what occurs 

 during the rainy season. 



October loth. Having sent the coolies forward, with 

 instructions to halt and camp on this side the Kongra 

 Lama pass, we followed them, taking the route by Palung, 

 and thence over the hills to the Lachen, to the east of 

 which we descended, and further up its valley joined the 

 advanced party in a rocky glen, called Sitong, an advan- 

 tageous camping ground, from being sheltered by rocks 

 which ward off the keen blasts : its elevation is 1 5,370 feet 

 above the sea, and the magnificent west cliff of Kinchin- 

 jhow towers over it not a mile distant, bearing due east, 



* The elevation of Tungu by boiling-point was 12,650 feet by a set of July 

 observations, 12,818 by a set taken on the 11th of October, and 12,544 by a set on 

 the 14th of October : the discrepancies were partly due to the temperature cor- 

 rections, but mainly to the readings of the thermometers, which were — 



July 28 sunset 189*5 air 47° 3 elev. 12,650 

 Oct. 11 noon 189'5 „ 37° 6 „ 12,818 

 Oct. 14 sunset 190-1 „ 45° 3 „ 12,544 



