}lf 



OF THE 



ASIATIC SOCIETY OF BENGAL. 



Part II.— NATURAL SCIENCE. 



No. I.— 1890. 



I. — On the occasional Inversion of the Temperature Relations between the' 

 Hills and Plains of Northern India. — By John Eliot, M. A., Mete- 

 orological Reporter, to the Government op India. 



[Received December 2nd ; — Read December 4th, 1889.] 



One of the more important features of the meteorology of the month 

 of January 1889 in Northern India was the remarkable variations of the 

 temperature relations between the hills and plains of Northern India 

 and more especially of Upper India. Under normal conditions of de- 

 crease of temperature vertically the temperature at the Punjab hill 

 stations should be 15° to 20° lower than at the adjacent plain stations. 

 The relation is sometimes reversed in the cold weather and the ni»ht 

 temperatures are found to be several degrees higher at the hill stations 

 than in the Punjab plains. Such variations or inversions of the or- 

 dinary temperature relations are of occasional occurrence in all moun- 

 tain and adjacent valley districts. They have been observed in pre- 

 vious years in Northern India, but were larger and more prominent in 

 Northern India in January 1889 than has been the case for many years.* 

 The present hence appears to be a favourable period for discussing the 



* Similar large and prolonged inversions of temperature occurred in the years 

 1879, 1880, and 1881 in Upper India. 

 i~ 1 



