It is a cause of serious regret that no arrangement has yet been finally concluded between the two Governments to secure by joint cooperation the suppression of the slave trade. It was the object of the British Government in the early stages of the negotiation to adopt a plan for the suppression which should include the concession of the mutual right of search by the ships of war of each party of the vessels of the other for suspected offenders. This was objected to by this Government on the principle that as the right of search was a right of war of a belligerent toward a neutral power it might have an ill effect to extend it by treaty, to an offense which had been made comparatively mild, to a time of peace. Anxious however, for the suppression of this trade, it was thought advisable, in compliance with a resolution of the House of Representatives, founded on an act of Congress, to propose to the British Government an expedient which should be free from that objection and more effectual for the object, by making it piratical. In that mode the enormity of tho crime would place the offenders out of the protection of their Government, and involve no question of search or other question between the parties touching their respective rights. It was believed, also, that it would completely suppress the trade in the vessels of both parties, and by their respective citizens and subjects in those of other powers, with whom it was hoped that the odium which would thereby be attached to it would produce a corresponding arrangement, and by means thereof its entire extirpation forever. A convention to this effect was concluded and signed in London on the 13th day of March, 1824, by plenipotentiaries duly authorized by both Governments, to the ratification of which certain obstacles have arisen which are not yet entirely removed. The difference between the parties still remaining has been reduced to a point not of sufficient magnitude, as is presumed, to be permitted to defeat an object so near to the heart of both nations and so desirable to the friends of humanity throughout the world. As objections, however, to the principle recommended by the House of Representatives, or at least to the consequences inseparable from it, and which are understood to apply to the law, have been raised, which may deserve a reconsideration of the whole subject, I have thought it proper to suspend the conclusion of a new convention until the definitive sentiments of Congress may be ascertained. These documents relating to the negotiation are with that intent submitted to your consideration. Our commerce with Sweden has been placed on a footing of perfect reciprocity by treaty, and with Russia, the Netherlands, Prussia, the free Hanseatic cities, the Dukedom of Oldenburg, and Sardinia by internal regulations on each side, founded on mutual agreement between the respective Governments.