We are credibly informed that many of the farmers in the immediate vicinity of Baltimore, where we now write, have turned their attention exclusively to hay, and that from one acre they frequently gather two tons, for which they receive fifty dollars. Let us now inquire how many dollars may be expected from an acre planted in cotton. Mr. Cameron, from whose able address before the Agricultural Society of Orange County, North Carolina, we have already gleaned some interesting particulars, informs us, that the cotton planters in his part of the country, "have contented themselves with a crop yielding only _ten or twelve dollars per acre_," and that "the summing up of a large surface gives but a living result." An intelligent resident of the Palmetto State, writing in De Bow's Review, not long since, advances the opinion that the cotton planters of South Carolina are not realizing more than one per cent. on the amount of capital they have invested. While in Virginia, very recently, an elderly slaveholder, whose religious walk and conversation had recommended and promoted him to an eldership in the Presbyterian church, and who supports himself and family by raising niggers and tobacco, told us that, for the last eight or ten years, aside from the increase of his human chattels, he felt quite confident he had not cleared as much even as one per cent. per annum on the amount of his investment. The real and personal property of this aged _Christian_ consists chiefly in a large tract of land and about thirty negroes, most of whom, according to his own confession, are more expensive than profitable. The proceeds arising from the sale of the tobacco they produce, are all absorbed in the purchase of meat and bread for home consumption, and when the crop is stunted by drought, frost, or otherwise cut short, one of the negroes must be sold to raise funds for the support of the others. Such are the agricultural achievements of slave labor; such are the results of "the sum of all villainies." The diabolical institution subsists on its own flesh. At one time children are sold to procure food for the parents, at another, parents are sold to procure food for the children. Within its pestilential atmosphere, nothing succeeds; progress and prosperity are unknown; inanition and slothfulness ensue; everything becomes dull, dismal and unprofitable; wretchedness and desolation run riot throughout the land; an aspect of most melancholy inactivity and dilapidation broods over every city and town; ignorance and prejudice sit enthroned over the minds of the people; usurping despots wield the sceptre of power; everywhere, and in everything, between Delaware Bay and the Gulf of Mexico, are the multitudinous evils of slavery apparent.