ME. H. F. BLANFOED ON THE WINDS OF NOETHEEN INDIA. 
593 
On the low plateaux to the south of the Ganges, and in the higher parts of the Gan- 
getic plains, the distribution of temperature follows laws very different to the above. In 
their, case a moderate elevation appears to determine an increase of the summer tempe- 
rature and a decrease only in the winter season, or, in certain cases, in the rains — conse- 
quently an increased annual range. Whether the mean temperature of the year shows 
a diminution corresponding to the altitude above sea-level, cannot very well be ascer- 
tained in the case of stations on the Gangetic plain, because their distance from stations 
of reference at or near the sea-level is so great, that it is impossible to eliminate the 
effects of other geographical differences, such as the slope of the ground, proximity of 
hills or water, &c. ; and I have already remarked that many of the registers are not, in 
my opinion, strictly comparable for small differences. But in the case of the somewhat 
more elevated plateaux, we have more trustworthy means of comparison in the stations 
of Hazareebagh and Berhampore, situated under nearly the same latitude, about equally 
distant from the sea, and affording observations with corrected thermometers, observed 
four times a day at equal intervals of six hours. Moreover their registers extend over 
the same period of the four years 1868-71. Finally, their geographical entourage is 
such as to offer no striking contrasts, except that the effect of which is in question — 
since Berhampore is on a comparatively dry part of the delta and at no great distance 
from its margin. Hazareebagh is situated at 2014 and Berhampore at 65 feet above 
the sea-level. The following Table gives the mean temperature of each station and 
their difference in each month : — 
Table of comparative temperatures at stations on a plateau and in the plains, showing 
the temperature-difference in each month. 
Hazareebagh, 
201 4 feet. 
Berhampore, 
65 feet. 
Difference, 
B.-H. 
Januarv .... 
61-7 
65-3 
3-6 
February 
66«2 
70-7 
4-5 
March 
74-3 
78-2 
3-9 
April 
82*6 
85*5 
2-9 
May 
85-9 
86-3 
0-4 
June 
81-4 
84-6 
3-2 

79-2 
84 
4-8 
August 
77-9 
84-1 
6-2 
September 
77-3 
83-4 
6-1 
October 
74-5 
81-7 
7-2 
November 
68-9 
73-5 
4-6 
December 
61-6 
66-2 
4-6 
Year 
74-3 
78-6 
4*3 
Eange 
24-3 
21 
6-8 
month, as compared with Boorkee, remains unexplained. But it also appears that the solar heat is at all times 
(on an average) less intense than on the plains, and that this difference is least in September and October. It 
would appear, then, that, on an average, less solar heat reaches the hill-surface at these stations, 7000 or 8000 
feet above sea-level, than the surface of the plain immediately below the hills. The figures are far from 
accounting for the observed variation of temperature-difference. 
