280 British Association for the Advancement of Science. 
added to their number, being equal to an increase of 276 per cent. 
But during that time we are fully warranted in believing that the 
wealth of the country has been augmented in a much greater pro- 
portion; and it may be fairly presumed that, but for the untoward 
interference of wars, and of that which is scarcely less inimical to 
national prosperity than war—commercial jealousy, the dealings be- 
tween the two countries must have become far more considerable 
than they are. During the period in question, America has added 
materially to her means of consuming foreign products by the extent 
to which she has carried the cultivation of exportable products. In 
1791, the whole export of cotton from the United States was under 
200,000 lbs. ; and it is shown by accompanying tables that the av- 
erage annual importation of American cotton into this country during 
the last ten years, has exceeded 225,000,000 lbs., the value of 
which cannot have been Jess than £7,500,000 per annum. In 1836 
our importation was 289,615,692 Ibs., which, at the average price of 
the year, probably produced more than £10,000,000 sterling. 
The intercourse between this country and the United States is 
important, not only to our merchants and manufacturers, but also to 
our ship owners, and that in a continually augmenting degree. The 
tonnage of vessels which entered the ports of the United States 
from foreign countries, in each year from 1821 to 1836, distinguish- 
ing American and British from other shipping, was as follows :— 
‘ Centesimal pro- 
oe American. | British. bora Total.. POR ARE Me iu Ash 
September. Vessels. tonnage. 
1821 765,098} 55,188) 26,338) 846,624 V2 
1822 787,961) 70,669) 29,872) 888,502 8.97 
1823 775,271} 89,553) 29,915) 894,739 11.55 
1824 850,033] 67,351] 35,016) 952,400 7.92 
1825 880,754) 63,036; 29,891) 973,681 7.15 
1826 942,206} 69,295) 36,359) 1,047,860 7.35 
1827 | 918,361] 99,114] 38,475] 1,055,950 10.79 
1823 | 868,381|104,167| 46,056 1,018,604 11.99 
1829 | 872,949] 86,377] 44,366| 1,003,692 9.89 
1830 | 967,227] 87,231] 44,669] 1,099,127 9.02 
1831 | 922,952/215,887| 66,061| 1,204,900 | 23.39 
1832 | 949,622/288,841]104,197| 1,342,660 30.41 
1833 |1,111,441|383,487/113,218| 1,608,146 34.50 
1834 |1,074,670/453,4951114,557) 1,642,722 42.19 
1835 /1,352,653/529,922 111,388) 1,993,963 39.18 
1836 |1,255,3841547,6061132,607! 1,935,597 43.62 
