RELATION TO THE DISTRIBUTION OF BAROMETRIC PRESSURE. 
353 
Table IX.—Mean Pressures at Places in the North-Western Provinces and Oudh, 
reduced to Sea-level and Latitude 45°. 
Month. 
Roorkee 
17-18 Years. 
Agra 
16-18 Years. 
Lucknow 
16-18 Years. 
Benares. 
16-18 Years. 
Jkarisi 
15-18 Years. 
January . . 
30 030 
30-032 
30-030 
30-016 
30-023 
February. 
29-949 
29-957 
29-949 
29-94.3 
29-951 
March 
29-842 
29-842 
29-835 
29-826 
29-844 
April .... 
29-707 
29-704 
29-698 
29-690 
29-709 
May .... 
29-577 
29-578 
29-593 
29-587 
29586 
June .... 
29-440 
29-450 
29-465 
29-463 
29-460 
July . . . . 
29-465 
29-464 
29-475 
29-467 
29-470 
August . 
29-527 
29-531 
29-541 
29-537 
29-540 
September . 
29-639 
29-637 
29-638 
29-633 
29-633 
October .' . 
29-824 
29-822 
29-823 
29-814 
29-821 
November . 
29-976 
29-976 
29-972 
29-954 
29-956 
December . 
30-042 
30-042 
30-044 
30-027 
30-026 
Year . . . 
29-750 
29-753 
29-755 
29-746 
29-754 
If we take the central station of the group—Lucknow—and measure the gradient 
from it towards each of the others without reference to the direction of the slope, we 
get the mean and extreme gradients per GO geographical miles, which are compared in 
Table X. with the mean wind velocity at the same four stations, and with the mean 
temperature and the diurnal temperature range. 
Table X.—Wind Velocity in the North-Western Provinces compared with Pressure 
Gradient and Temperature. 
Month. 
Mean 
Gradient. 
Maximum 
Gradient. 
Wind Velocity 
per Diem. 
M ean 
Temperature. 
Diurnal 
Range. 
// 
Miles. 
January . 
•0020 
•0029 
58-2 
59-2 
27-5 
February 
•0012 
•0032 
73-7 
64-9 
27-4 
March . 
■0027 
•0036 
87-2 
74-6 
30-0 
April.... 
-0021 
•0038 
98-0 
85-4 
30-7 
May .... 
•0037 
•0038 
114-4 
91-1 
27-1 
June .... 
•0031 
•0060 
120-3 
9P5 
21-3 
July .... 
•0028 
■0044 
95-8 
85-0 
13-9 
August . 
•0024 
•0034 
79-6 
83-7 
13-1 
September . 
•0010 
•0020 
75-0 
83-0 
16-0 
October . 
•0011 
•0036 
52-6 
77-5 
25-3 
November . 
•0035 
•0072 
40-6 
67-7 
30-7 
December . 
•0033 
•0068 
45-6 
60-0 
28-9 
This Table fully justifies the statement above made as far as the monthly means are 
concerned. The smallest values of the gradient, both mean and extreme, are found 
in September, when the wind velocity does not differ much from the average. The 
mean gradient is steepest in May and November, the one month having a high wind 
velocity, and the other the lowest of the year, while the maximum value of the steepest 
gradient is also in November, the month of least wind movement. The suggestion, 
MDOCCLXXXVII. —A. 2 Z 
