ON THE STATISTICS OF DUKHUN. 235 
dewing point 31°, temperature 50°, in December. It might 
be supposed that the hottest months in the year, March, 
April, and May, would also be the driest; but such is not the 
fact. The powerful action of the sun on the ocean, in the 
middle of March, raises a large quantity of aqueous vapour, 
which continues to increase in the ratio of the sun’s progress 
north: the westerly winds waft this vapour into Dukhun; 
much of it is arrested by the Ghats and hilly tracts eastward 
of these mountains ; accounting for the sensible moistness of 
the air, the frequent night fogs, and deposition ‘of dew in this 
line, in the end of March, and in all April and May. The 
supply of moisture diminishes in proportion to the distance 
eastward from.the sea, to the limits of the Coromandel coast 
monsoon. We in consequence find the Ghats, Poona, Ahmed- 
nuggur, and the Bala Ghat, all with very different dewing 
points in the hot months. 
The hygrometric state of the air in Bombay and Dukhun is 
remarkably contrasted: in fact, there is more aqueous vapour 
suspended in the air in Bombay in the hot months, than there 
is at Poona at any time during the monsoon. In April and 
May, 1826, in Bombay, the monthly mean dewing points were 
respectively 72°84 and 75°°59, temperature 83°°48 and 84°52, 
_ a cubic foot of air holding 8°988 grains, and 9°748 grains of 
water suspended; whilst July, the most rainy month during 
the monsoon, at Poona, had only a mean of 8°775 grains of 
water suspended. In 1827, the means of ten days’ observations 
in Bombay, in April, gave 10'243 grains of aqueous vapour in 
a cubic foot of air; and the greatest mean quantity at Poona 
was in June, and it amounted only to 8931 grains. In 1828, 
in the month of March, the following were the dewing points 
in consecutive days, travelling from Bombay to Poona; Bom- 
bay, 10th March, 4 p.m., 11:205 grains of water in a cubic 
_ foot of air; at Poona, at the same hour, on the 14th March, 
2273 grains. At Bombay, on the 10th, at sunrise, and at 94 
A.M, the dewing points were respectively 72° and 71°, tem- 
perature 75° and 81°°5, a cubic foot of air containing 8°873 
grains at the former hour, and 8°487 grains at the latter hour. 
The following morning at Kundallah, on the top of the Ghats, 
1744: feet above the sea, at the same hours, the dewing points 
were 36° and 40°, temperature 72° and 78°, equivalent only to 
2690 grains, and 3:004 grains of water in a cubic foot of air. 
In the afternoon of the same day, at Karleh, 2015 feet above 
the sea, seven miles east of Kundallah, a cubic foot of air held 
2954 grains, and on the 12th, at 4 p.m., 2°611 grains of 
aqueous vapour. On the summit of the hill fort of Loghur, 
