From the reports of the commanding officers it appears that the trade is now principally carried on under Portuguese colors, and they express the opinion that the apprehension of their presence on the slave coast has in a great degree arrested the prostitution of the American flag to this inhuman purpose. It is hoped that by continuing to maintain this force in that quarter and by the exertions of the officers in command much will be done to put a stop to whatever portion of this traffic may have been carried on under the American flag and to prevent its use in a trade which, while it violates the laws, is equally an outrage on the rights of others and the feelings of humanity. The efforts of the several Governments who are anxiously seeking to suppress this traffic must, however, be directed against the facilities afforded by what are now recognized as legitimate commercial pursuits before that object can be fully accomplished. Supplies of provisions, water casks, merchandise, and articles connected with the prosecution of the slave trade are, it is understood, freely carried by vessels of different nations to the slave factories, and the effects of the factors are transported openly from one slave station to another without interruption or punishment by either of the nations to which they belong engaged in the commerce of that region. I submit to your judgments whether this Government, having been the first to prohibit by adequate penalties the slave trade, the first to declare it piracy, should not be the first also to forbid to its citizens all trade with the slave factories on the coast of Africa, giving an example to all nations in this respect which if fairly followed can not fail to produce the most effective results in breaking up those dens of iniquity. M. VAN BUREN