March 24, 1892J 



NA TURE 



49' 



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values, it appears that those of the latter are from one and 

 a half times to nearly twice as great as those of the former. 

 On the other hand, in the cold waves which follow the 

 storm, the day temperatures frequently show a greater 

 relative depression than those of the night-time, indicating 

 therefore that the nocturnal radiation under a clear sky is 

 far from being the only cooling agency operative. 



Notwithstanding this latter feature, the cold waves 

 often bring about an inversion of the normal tem- 

 perature relations between the hills and the plains, and 

 that in a very remarkable degree. This was observed on 

 no less than eleven nights in January 1889 ; and a very 

 interesting paper on the subject was contributed by Mr. 



January 30. 



January 31 



F'ebruary i. 

 Temperature isabiiormals of twenty-four hours preceding 8 a.m. 



Eliot to vol. lix., Part ii., of the Journal of the Asiatic 

 Society of Bengal. On one occasion, the figures of 

 which are given, not only was the minimum night 

 temperature of the hill stations (at elevations between 

 6000 and 8000 feet) from 8' to 13'' higher than on the 

 adjacent plains, but actually higher than anywhere on 

 the Indo-Gangetic plain except only the coast districts of 

 Bengal. 



Before noticing the barometric features of these storms, 



let us see what is the probable explanation of their striking 



1 vicissitudesof temperature. Theweathcr charts and reports 



NO. 1 169, VOL. 45' 



