XXVlll APPENDIX, 
The hottest time of the twenty-four hours at Madras, taking the mean of the twelve 
months, is about three-quarters of an hour past noon ; this varies at different times of 
the year from 11 4.m.to3p.m. The coolest time of the twenty-four hours is about 
half an hour after four in the morning; and the thermometer is usually at the mean 
height a little after seven in the evening, and about nine in the forenoon. 
The following statement shews the average times of the greatest, least, and mean heat 
during each month; and is formed from the diary in 1823 for every hour: 
Ee, Aan: 
MONTHS. GREATEST, LEAST. MEAN. 
Afternoon. Morning. Evening. Forenoon. 
H. He H. H. 
January .. a 1°3 4°3 7°2 g°2 
February .. a 12° 5°3 7°2 88 
March .. He 12°3 5'0 7°4 8°7 
April z.! 12° 4°7 7 °2 8-6 
May ae nie 11°3 A.M. 4°1 64 85 
June oe aS 2° 4°3 7°8 8-8 
July We os 2°3 4° 6-6 96 
August .. o 2° 3° 7°5 8°9 
September a 2° 4°3 7°9 8°6 
October .. a 12° 4°8 6-7 8°7 
November ue 12°3 5°7 64 8-8 
December Fs 12°7 5°3 8-6 9°5 
Mean .. 12°8 4°6 7°2 8+9 
According to the mean of the hygrometer during the year 1823, the atmosphere at 
Madras is least moist at about two o’clock in the afternoon; is most moist at a quarter 
before six in the morning; and is in a mean state at a quarter past nine at night, and 
a quarter past ten in the forenoon. The following abstract from the hourly diary in 
1823, shews the average times when the atmosphere has the greatest, least, and mean 
moisture for each month: 
