Km.above ground 
1921.| The Eighth Indian Science Congress. xev 
kilometre; and during the cold weather, with its rapid changes 
at the surface from the pleasantness of midday to the evening 
of humidity in India by the thirstiness of a dry soil. 
. These iti 
matically in Fig. 1. Here we have variations in temperature 
AG RA: Temperatures. Max. X: Min.N: 
aa 
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os 
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figcd 
(7d Lines shor rrourads at ground, ard: afpreon. romans above. aotlec 
lines show afyvrox. oxtrernes)” 
between day and night at the ground-level in Agra averaging 
25° F in the months of January and May, the hottest and coldest 
months of the year, and reaching well over 30° F on individual 
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deal with the air-stratum limited by a height not less than 15 
kilometres above the surface, for it is within the whole of this 
region, but especially perhaps in its upper parts. that the phy- 
sical conditions which intimately affect weather are to be 
sought. 
