"معاملات الجمعية الجغرافية في بومباي. من يناير ١٨٦٣ حتى ديسمبر ١٨٦٤. (تحرير السكرتير.) المجلد XVII." [‎٣‎٠‎٨] (٥٢٤/٤٨٧)

308 REPORT ON DHUR YAROO
enjoyable. The greatest height shown by the Thermometer in experi
ments on solar radiation was 148°; while at Larkhana at the same time
and under similar circumstances, namely, with the bulb wrapped in a
dark coloured cloth, and the instrument placed horizontally on the
ground in an exposed position, 170° was shown. This is opposed to
the theory that “ the calorific effects of the sun increase as we ascend ”
or it may be that the Thermometer is only a measure of the accumu
lated free heat.
Moisture.
The experiments on moisture showed very favourably in April and the
early part of May. The mean depression of the wet bulb thermometer
varied between 2° and 9°, but towards the end of May and in the
month of June, increased to 12° and 23°. In August there were some
showers of rain, and the atmosphere was genera % moist. Mean
depression only a few degrees, and during the night a good fall of dew.
Winds.
North-west winds prevailed in the early part of the season. These
were always cold, but often disagreeably high and raw. The South
erly breezes in the end of May and after were very pleasant at night,
but died away generally from early morning to mid-day, leaving the
atmosphere oppressive for out-door exercise.
Rain.
Heavy rain and hail fell in April and May. It generally came from
the North-west and West; the showers never lasted more than half
an hour $ were ushered in by high cold winds, and always followed by
cool and delightful weather. The later rain came from the East and
North-east, and was no doubt the result of the rising of the river and
spread of the water over the plains. It was always preceded by days of
cloudy weather, during which the temperature was most enjoyable, and
out-door exercise might be taken without inconvenience.
About Six inches of rain fell in all. Seven-eighths of this was in the
early season. An interval of fifty-one days elapsed between the end of
May and the 20th of July without any, and then but a shower of half
an hour s duration. This distribution appears unusual As a rule the
natives apprehend drought in the early part of the year, and look
forward to a healthy supply of water about July. The seasons vary