4 
course has been as yet observed only at Sitka, on the extreme north-west 
of the continent, and in Europe at considerable mountain elevations. 
Nothing apparently connected with it, either by similarity or contrast, 
has been observed on the mainland of North America; but in the sea to 
the north of the continent, which in following the coast-line may be 
said to lie between Norfolk Sound and the Gulf of St. Lawrence, we find 
an annual course of atmospheric pressure, decidedly different from that 
which obtains in these seas. 
Summary of Barometric Observations made in Charlotte Town, and the 
southern parts of the Gulf of St. Lawrence, between 1841 and 1850. 
| 
Jan. | Feb. /March.| April. | May. | June.| July. | Aug. | Sept. | Oct. | Nov. Dec. 
| 1842 | 29-789 | 29-838 | 29-899 | 29-895 | 29-842 | 29-986 | 30-044 | 30-172| 29-943 | 29-899 | 29-852 | 29-853 
1843 | 29-946 | 29-725 | 29-663 99-927 | 29-977 | 29-900 | 29-960 | 30-120| 30-020 29-843 29-857 | 29-920 
184 | 29-657 | 29-928 | 29-923 30-070 | 29-927 | 29-970 | 29-933 30-036 | 30-063 | 29-985 29-800 | 29-777 
1845 | 29-894 | 29-856 | 29-895  29-900|29-944| . . 
} 
Se 29-964 | 29-958 | 30-115 | 30-044 | 29-837 | 29-729 | 29-816 
| 
...| . . .|29°790| 29-983 29-695 | 29-712 
| | | | 
1846 | 29-568 | 29-590 | 29-716 | 29-776 | 29-736 | 29-808 29-750 | 29-817 | 29-803 | 29-873 | 29-704 29-510 
1847 | 29-610 | 29-623 | 29-520 | 29-593 | 29-790 | 29-847 | 29-903 | 29-959 | 20-883 | 29-821 | 29-764 29-774 | 
; 1848 | 29.820 | 29-485 | 29-682 29-782 | 29-704 | 29-773 | 29-909 | 29-910 | 29-802 | 29-783 29-765 | 29-784 
{ 
| 1849 | 29-617 | 29-887 | 29°S13 29-583 | 29-817 | 29-769 | 29-872 | 29-892 | 22-975 | 29-820 | 29-690 | 29-590 
| 
i 
| 1850 | 29-730 | 29-560 | 29-470 | 29-590 | 29-720 | 29-748 29-797 | 29-724 | 29-791 
| 
| 
ae Rae aes 29°725 | 29-791 29-829) 29°863 29-903 29-972 | 29-901 | 29-872 | 29-762 = ge 
Mean of all the Observations reduced to the Level of the Sea. 
| Jan. 
Feb. | March. | April. 
eo 29-766 
From the observations carried on for three years, on board H. M.S8. 
Investigator, in Melville Sound, and those of Captain Parry, at Melville 
Island, we find that the barometer was always lowest in July, August, 
and September; and comparatively high, although not highest, in 
January, February, and March. The low state of the barometer in the 
former months was marked in all Parry’s voyages ; but from his observa- 
tions, as well as from those made in the Investigator, the greatest height 
was in April and May. 
It would seem that the annual course of atmospheric pressure, which 
prevails all over Asia (and which is the reverse of that observed in the 
Gulf of 8. Lawrence), extends beyond the shores of Siberia, and is met 
in a modified form, on the American side of the Arctic Sea. 
May. | June. | July. | Aug. sept. | Oct. | Nov. | Dec. 
29°769 | 29-835 
29°873 | 29-863 eye 2s 2 | cela 29°S06 | 29-792 
| 
