On the seventeenth of December, 1829, Mr. Clay delivered an address before the Colonization Society, of Kentucky, at Frankfort, in which the principles and objects of that humane institution were ably and eloquently supported. In it, he alluded pointedly to the subject of slavery, surveyed the numerous train of evils consequent upon it, and expressed his hearty desire to coöperate with any society which would mitigate, lessen, or remove them. He lingered, with peculiar pleasure, upon the success which had unexpectedly crowned the efforts of the American Colonization Society, and declared his sincere conviction, that it had most abundant encouragement to persevere and endeavor to redouble its exertions. ‘We may boldly challenge the annals of human nature,’ said he, ‘for the record of any human plan for the melioration of the condition or the advancement of our race, which promises more unmixed good, in comprehensive benevolence, than that of the Colonization Society, if carried into full operation. Its benevolent purposes are not confined to the limits of one continent――not to the prosperity of a solitary race. They embrace the largest two portions of the earth, with the peace and happiness of both descriptions of their present inhabitants, and the countless millions of their posterity. The colonists, reared in the bosom of this republic, with a knowledge of the blessings which liberty imparts, although now unable to share them, will carry a recollection of them to benighted Africa, and light up, in time, her immense territory. And may we not indulge the hope, that, in a period of time not surpassing in duration that of our own colonial and national existence, we shall behold a confederation of republican states on the western shores of Africa, with their congress, and their annual legislatures, thundering forth in behalf of the rights of man, and causing tyrants to tremble on their thrones!’