Appendix I. DECREMENT OF TEMPERATURE IN ASCENDING. 4/51 



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. 



Mouth. 



February and March 



February . . . 



April 



April . . . . 

 March and April 

 March, April, May . 



Upper Stations. 



Jillapahar, 7,430 feet, 



Do., do., „ 



Leebong, 6000 „ 



Jillapahar, 7,430 ,, 



Khersiong 4,813 „ 



Jillapahar, 7,430 „ 



Lower Stations. 



{ 



Leebong, 6000 feet 



Guard-house, Great "I 

 Rungeet, 1,864 feet J 



Guard-house, do., „ . 



Khersiong, 4,813 „ . 



Punkabaree, 1850 „ . 



Do., do., „ . 



Mean, 



l° = 269ft. 



1°=298 „ 



1°=297 „ 



1°=297 „ 



1°=223 „ 



1° = 253 „ 



1°= 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 less 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 may 

 be roughly indicated thus : — 



1° = 300 feet, for elevations from 1000 to 8000 feet. 

 1° = 320 „ „ „ 8000 „ 10,000 „ 



1° = 350 „ „ „ 10,000 „ 14,000 „ 



1° = 400 „ „ „ 14,000 „ 18,000 „ 



VIII. — Khasia mountain observations. 















<u 



Date. 



to 



o3 o 



05 03 



o 



Si 



o ft 



J 3 tO 



63 



w 



2 > 



o 



70-1 



S.1 



,Q cs 



Bt 



o 

 67 





Altitude abo\ 

 the Sea. 



ChurraPoonji, June 13 — 26 



86-3 



1 =300 feet. 



4,069 ft. 



„ Aug. 7 to Sept. 4. 



84-6 



196 



69-2 



214 



1 =331 „ 



4,225 „ 



Oct. 29 to Nov. 16 



80-7 



85 



63-1 



133 



1 =282 „ 



4,225 „ 







354 





414 



Mean, 304 feet 





G G 2 



