The slave states are learning this truth by fatal experience. Most of them are silently writhing under the great curse. Virginia has uttered her complaints aloud. As yet, however, nothing has been done even there, save a small annual appropriation for the purpose of colonizing the free colored inhabitants of the state. Is this a remedy? But it may be said that Virginia will ultimately liberate her slaves on condition of their colonization in Africa, peacefully if possible, forcibly if necessary. Well, admitting that Virginia may be able and willing at some remote period to rid herself of the evil by commuting the punishment of her unoffending colored people from slavery to exile, will her fearful remedy apply to some of the other slaveholding states? It is a fact, strongly insisted upon by our Southern brethren as a reason for the perpetuation of slavery, that their climate and peculiar agriculture will not admit of hard labor on the part of the whites; that amidst the fatal malaria of the rice plantations the white man is almost annually visited by the country fever; that few of the white overseers of these plantations reach the middle period of ordinary life; that the owners are compelled to fly from their estates as the hot season approaches, without being able to return until the first frosts have fallen. But we are told that the slaves remain there, at their work, mid-leg in putrid water, breathing the noisome atmosphere, loaded with contagion, and underneath the scorching fervor of a terrible sun; that they indeed suffer; but, that their habits, constitutions, and their long practice enable them to labor, surrounded by such destructive influences, with comparative safety. The conclusive answer, therefore, to those who in reality cherish the visionary hope of colonizing all the colored people of the United States in Africa or elsewhere, is this single, all-important fact: The labor of the blacks will not and cannot be dispensed with by the planter of the South. To what remedy, then, can the friends of humanity betake themselves but to that of emancipation? And nothing but a strong, unequivocal expression of public sentiment is needed to carry into effect this remedy, so far as the general government is concerned.