3 / 
_ June, July, August, and September ; indeed, occasionally, on 
some days in those months, the mercury does not move at all. 
Mean Temperature.—In 1828, Dr. Walker, at Ahmednug- 
gur, at an elevation of 1900 feet above the sea, made the 
mean temperature 78°; and though I was living in tents, and 
moving about the country, I made it only 77°'93. Of course, 
on higher or lower levels this mean temperature will be di- 
minished or increased. It is necessary, however, to note one 
remarkable fact, namely, that the mean temperature of places 
on the table-land of the continent of India is much higher than 
the calculated mean temperature of the same places agreeably 
to Mayer’s formula. The calculated mean temperature of 
Ahmednuggur is 72°27, observed 78°; of Poona 72°78, ob- 
served 77°°7; of Mhow, in Malwa, 69°86, observed 74°: 
temperature of a spring in the hill fort of Hurreechundurghur 
69°°5, calculated temperature 65°°45. 
The results of several years’ observations indicate that the 
annual mean temperature of 9°:30 a.M., is nearly identical 
with the mean temperature deduced from the maxima and the 
minima. 
With respect to the greatest diurnal, and the greatest 
monthly range of the thermometer, the winter months have 
a range nearly in a quadruple ratio to the monsoon months. 
The latter have mostly the temperature very equable, the 
difference of the monthly means rarely exceeding 3°, and the 
greatest diurnal range in five years only once amounted to 
13°6, The latter end of March, and April, and May are the 
hottest periods of the year, from the position of a nearl 
vertical sun, the intensity of whose influence is but slightly 
ON THE STATISTICS OF DUKHUN. 233 
modified by the occasionally cloudy weather: the temperature 
falls in June, and continues nearly stationary until the end of 
September: it then rises in October, but falls at the end of 
the month, until its annual minimum in December or January. 
It is low the early part of March, but rises suddenly after the 
middle of the month, occasioning a difference of 6° or 8° 
| between the means of February and March, which is more 
than double that of other consecutive months in the year. 
The rise in October is also sudden, but does not occasion so 
great a difference of means as between February and March. 
It will thus be remarked that the temperature does not fol- 
low the sun’s declination, owing to the interference of the 
monsoon. 
Moisture.—A remarkable feature in the climate of Dukhun 
is the small quantity of aqueous vapour generally suspended in 
| the air, compared with the proximate climate of Bombay and 
| 
