RELATION TO THE DISTRIBUTION OF BAROMETRIC PRESSURE. 
375 
jiling was still more favourable for easterly winds, there was an actual excess of rain¬ 
fall over the Bengal provinces, amounting to 10 per cent., against a defect of 20 per 
cent, in Upper India. 
The character of the Ajmere observations for accuracy, moreover, is not nearly so 
high as that of the work of the Sutna observer, and the barometer at Ajmere has 
been several times changed, while there has also been a change in its position during 
the years compared. ITence, though every care has been taken to correct the obser¬ 
vations for such changes, it is possible that there may be some residual errors 
undetected, which, though negligible, or nearly so, in the mean of a long term of years, 
many of which were anterior to the changes mentioned, may introduce some confusion 
in comparing the observations of single years. For these reasons, it is probable that 
the best criterion of the pressure gradients, prevailing over Bundelkhand, Rajputana, 
and the North-West Provinces, will be a comparison of the observations of Sutna and 
Ranikhet. 
Thus estimated, the gradient for westerly winds was relatively high in May, July, 
and October, 1877. It was low in May and October, 1879, and in July there was 
a considerable gradient for easterly winds. In 1880, the gradient for westerly winds 
was high in May and October, and there was a small gradient for easterly ones in 
July ; thus, on the whole, the upper winds were such as to make the rainfall less than 
usual. In the dry year, 1883, the gradients for westerly winds were greater, or for 
easterly ones less, than in the wet year 1884, both in May and July; but in 
July, 1883, there was nevertheless a rather high gradient for easterly winds, contrary 
to what might be expected. It was in August, 1883, however, not in July, that the 
principal deficiency of rain occurred. 
The verification of theory by means of the deductions from observations embodied 
in Table XIX. being thus less definite than is desirable, it will be worth while to 
work out the pressure gradients between Sutna and Ranikhet for the other months 
of the rainy season in each of the years compared. Table XX. gives the pressures 
at 10,000 feet for the months of June, August, and September. 
Table XX.—Pressures at 10,000 feet for the other Months of the Rainy Season 
in certain Years. 
Year. 
Sutna. 
Banikbet. 
June. 
August. 
September. 
June. 
August. 
September. 
1877 . . . 
20-907 
20-836 
20-968 
20-832 
20-810 
20-892 
1879 . . . 
20-857 
20-730 
20-824 
20-772 
20-718 
20-829 
1880 . . . 
20 881 
20-811 
20-911 
20" 765 
20-781 
20-842 
1883 . . . 
20-875 
20-801 
20-858 
20-782 
20-785 
20 840 
1884 . . . 
20-903 
20-752 
20-828 
20-793 
20-779 
20-851 
