OBSEUVATIONS TAKEN IN INDIA. 
321 
Monthly Mean Pressure of the Atmosphere, reduced to 32°. 
Madras. 
Bombay, 35 feet. 
Calcutta, 
18 feet. 
Aden, 187 feet. 
Poona, 
1823 
feet. 
Mahabuleshwur, 
4500 feet. 
Dodabetta, 
8()40 feet. 
Royal Ob- 
servatory, 
Green- 
wich, 
159 feet. 
Years .... 
1842. 
1843. 
1844. 
1845. 
1843. 
1844. 
1848. 
1843, 
1844. 
1847. 
1848. 
1830. 
1828, 
1829. 
Means 
of lyear. 
1847, 1848. 
Means of 
8 years, 
184J to 
1848. 
January. 
29-995 
29-985 
29-998 
30-015 
29-923 
29-947 
30-000 
1 
29-937 29-774 
29-872 
28-087 
25-465 
25-737 
22-081+ 
29-766 
February 
29-972 
29-966 
29-980 
29-965 
29-889 
29-928 
29-980 
29-915 29-832 
29-853 
28002 
25-452 
25-765 
22-098 
29-737 
March... 
29-860 
29-886 
29-907 
29-924 
29-839 
29-869 
29-838 
29-793 29-770 
29-783 
27-952 
25-576 
25-688 
22 132 
29-750 
April ... 
29-805 
29-864 
29-809 
29-818 
29-813 
29-804 
29-716 
29-656 29-690 
29-711 
27-907 
25-538 
25-667 
22-097 
29-708 
May . . . 
29-713 
29-692 
29-700 
29-712 
29662 
29-750 
29-636 
29-563 
29-635 
29-5841 27-846 
25-467 
25 643 
22-055 
29-785 
June ... 
29-664 
29-709 
29668 
29-705 
29-654 
29-628 
29-516 
29-184 
29-545 
29-511 
27-768 
25-377 
25 604 
21-966 
29-797 
July ... 
29-697 
29-709 
29-723 
29 726 
29-661 
29-648 
29-528 
29-517 
29 491 
29-475 27-766 
25-319 
25-600 
21-974 
29-799 
August . . 
29-729 
29-759 
29-731 
29-742 
29-730 
29-701 
29-571 
29-516 
29-540 
29-483 27-840 
25-387 
25-647 
22-003 
29-787 
Sept. ... 
29-768 
29-788 
29-793 
29-830 
29-779 
29-795 
29-713 
29-662 
29-639 
29 626, 27-925 
25-524 
22 004 
29-809 
October 
29-873 
29-863 
29-868 
29-850 
29-845 
29 825 
*29-881 
29-633 
29-811 
29-745 
27-923 
25-810 
22-050 
29-858 
Nov. ... 
29 941 
29-926 
29-963 
29-984 
29-887 
29-924 
30-005 
29-867 
29-897 
29-855 
28-018 
125-500 
25-733 
22-077 
29-714 
Dec. . . . 
30-201 
30001 
29-926 
29-965 
29-961 
29-893 
30-021 
29-951 
29-902 
29-876 
28-068 
t25-498 
25-739 
22-043 
29-857 
Means I 
of year J 
29-8515 
29-8457 
29-839 
29-853 
29-805 
29 809 
29-783 
29-707 
29-711 
29-698 
27-925 
25-684 
22-046 
29-781 
The mean monthly pressure at Calcutta for 1843-44 is from reductions of Dr. 
McClelland, and the record commences in November 1843 and ends in October 
1844. An inspection of the above Table shows that the maximum mean monthly 
pressure does not occur in the same month in successive years. At Madras, in 1842 
and 1843, the maximum pressure was in the month of December, in the two follow- 
ing years it was in the month of January. At Bombay, in 1843, the maximum was 
in December, in 1844 in January, at Calcutta, in 1843, in December, and in 1848 it 
was in December. At Madras the minimum monthly mean pressure, in three years 
out of the four, occurred in the month of June. In 1843 it was in the month of 
May, but at Bombay in the same year in June: at Bombay and Calcutta in 1844, 
and in 1848, at Calcutta, it took place also in June. At Poona, at 1823 feet, the 
maximum was in January and the minimum in July. At Dodabetta, at 8640 feet, 
unlike any of the stations at the sea-level, the maximum mean monthly pressure took 
place in March: the same thing occurred at Mahabuleshwur in 1828-29, at 4.500 
feet above the sea ; but like the other stations the minimum pressure at Dodabetta 
occurred in June, but at Mahabuleshwur in July. Dr. Buist of Bombay mentions 
that for three years at Aden (1846-48) the minimum occurred in July, and the 
maximum in February, but by the preceding Table the maximum in 1847 and 1848 
occurred in December, and the minimum in both years in July. At Greenwich the 
means of thirty years’ observations, recorded in Belville’s Manual, give results in- 
verse to those in India, as the maximum pressure is in June and the minimum in 
November ; but there is a second maximum in January and a second minimum in 
March; but the greatest daily mean pressure occurs about the 9th of January, and 
* Thirteen days’ observations wanting. f For 1828, remaining months for 1829. 
t For 1848, remaining months for 1847. 
§ The means of one year’s pressure at Mahabuleshwur is inserted from the Bombay Medical Journal, but 
the observations do not appear to have been corrected for temperature, and as the maximum pressure is repre- 
sented to occur in October and the minimum in September, there evidently must be some mistake, and I 
therefore only notice my own simultaneous observations ’"’ith Dr. Walker for 1828-29. 
MDCCCL. 2 T 
