APPENDIX. 
XXVli 
The subjoined Table shews the Mean Monthly Heights of the Barometer and Thermo- 
meter, between the Years 1796 and 1821, with the Heights of the Hygrometer and 
the Mean Fall of Rain. 
Mean Monthly Height for 21 Years, 
between 1796 and 1821. 
Mean Fall of Rain for 13 Years, 
between 1803 and 1821. 
Hygrometer, 
MONTHS, | between 1819 
| aul eke Including the Fall in Storms 
Barometer. | Thermometer. whole Fall reduced to the 
| during Storms. Mean Fall. 
Inches. | Deg. Dry. Inches. Inches. 
January...... 30°085 =| 75 +168 13°0 0-608 0 ‘608 
February..... SOLO7O8 Sai 157 17°5 0°127 0°127 
March iircetactec 30 °041 79920 7/5 0 *538 0 +538 
April ... 29 '955 82-417 18:0 0 °384 0-384 
May) oct ate oc 29 851 86-918 20°9 1°419 0121 
June... 29 °861 88 +159 28-9 0 °646 0°746 
Dil Vioelajetedolerete 29 °867 85 *645 28 °6 3 °303 3-303 
August ...... 29 °879 84 °732 18°8 3°552 3°552 
September ... 29 *g08 83 825 15°5 4824 4824 
October ..... 29 "942 81-858 17°6 11°294 11294 
November... .. 29 °956 78 +672 79 14803 14 °803 
December.... 30 *074 78 +843 18-2 8-618 6-048 
Mean.... 29 958 81-693 18°5 507124 46 +348 
We find upon examination of the first of the three Tables, that the hottest day at 
Madras, by the mean of all the daily observations during twenty-one years, is the 15th 
of June; when the mean height of the thermometer in the twenty-four hours is 89°19 ; 
the mean varying in different years from 95™1 to 81°6. The coldest day is the 9th of 
January ; the mean height of the thermometer on that day being 74°59 ; and the mean 
varying from 77°1 to 71°"7. About the 20th of March and the 20th of October the 
thermometer is at its mean height. 
The mean height of the thermometer, as deduced from the mean monthly heights, is 
81°°'7: the greatest extreme of heat was 104°-5; the least height of the thermometer 64 ; 
the former occurred in the year 1815 at 2 p.m. on the 19th of May, a hot land wind 
blowing ; and the latter on the 12th January 1819, at about sun-rise; such extremes, 
however, are rare, the thermometer at Madras being seldom higher than 98° or lower 
than 67°, 
4 L 
