Great Britain has for half a century been employing physical force for the suppression of the slave trade, which after the expenditure of upwards of forty millions sterling, and the noble sacrifice of the lives of some of the best and bravest of her sons, still exists. It is but just to state that the exportation of slaves from Africa has been reduced from 150,000 to 50,000 per annum, by the persevering effort of those who are opposed to a traffic disgraceful to Christianity. Is the ultimate object of those who are opposed to this traffic its suppression or its annihilation? The annihilation of the slave trade and slavery in Africa was unquestionably the aim of the philanthropists who originated this great movement. The experience of half a century has proved that physical force cannot destroy the traffic while there is a demand for slave labor. Diplomacy must be baffled in its well-intentioned efforts to oppose this traffic while the profits for carrying each slave from the continent of Africa to the island of Cuba amount to the enormous return of fourteen hundred percent. It is a well-attested fact, that the same quality of cotton may be obtained from Africa for twenty millions of money for which Great Britain pays the slaveholders in America thirty millions per annum. If cotton can be sold in the Liverpool market at anything less than 4-3/4d. per lb., the slaveholders in America will cease to grow what, under altered circumstances, would be unprofitable. Cotton of middling quality (which is in the greatest demand) may be obtained in West and Eastern Africa at 4d. per lb.; and, already, cotton from Western Africa (Liberia) has been sent to Liverpool, there re-shipped, and sold at Boston, in the United States, at a less cost than cotton of a similar quality could be supplied from the Southern States of the Union. The Executive Committee feel assured that the peaceful means adopted by this society for the Christian civilization of the African races require only the advocacy of _Christian Ministers_ and the _Press_ generally to be responded to by the people of Great Britain. The horrors of the slave trade, as perpetrated on the continent of Africa and during the middle passage, can only be put an end to by the establishment of a lawful and a lucrative, a powerful and a permanent, trade between this country and Africa; which will have the effect of destroying the slave trade, spreading the Gospel of Christ, and civilizing the African races. For this purpose the support of the mercantile class is earnestly solicited for a movement which--commenced by the colored people of America flying from oppression--bids fair to open new cotton fields for the supply of British industry, and new markets for our commerce, realizing the sublime promise of Scripture, "Cast thy bread upon the waters, and after many days it shall return unto thee."