The annual imports from western Africa into this country probably exceed a million of dollars, and into Great Britain are about four millions. The palm oil trade, now becoming of great value, had hardly an existence twelve years ago, is rapidly increasing, and may be increased to an almost indefinite extent. Hitherto, the slave trade has been at war with all improvement and every kind of innocent commerce. Its cessation will be succeeded by the cultivation of the soil, and the growth of trade in all the varied and valuable productions of the African climate. It is of infinite importance that the natives of Africa should be convinced that agricultural labor, and the substitution of lawful trade for the infamous commerce in human beings, will be for their advantage; and that, in their intercourse with them, our own merchants should possess every privilege granted to those of England, or any other nation. The establishment of a commercial agency, (as recommended by Dr. Hall,) to reside in Liberia, and occasionally to visit, in a Government vessel, various points on the coast, to ascertain the best sites for mercantile establishments, to form conventions and treaties of commerce, and for the suppression of the slave trade with the principal chiefs, to take charge of the stores and other property sent out for our ships of war, to guard the rights and interests of our seamen, and secure for American vessels a free and unrestrained right of trade at all important stations, the committee would recommend as an object urgently demanded by interest and humanity. The time has arrived, in the opinion of the committee, when this subject of African colonization has become sufficiently important to attract the attention of the people, in its connexion with the question of the political relations which these colonies are to hold with our Government. _Speech of the Hon. Henry Clay._ _At the 31st Anniversary_ of the American Colonization Society, held at Washington, January 18, 1848, the Hon. HENRY CLAY, in the course of his speech, made the following remarks: