Look at the diversified forms in which the mind of the north finds development: behold its manifold workings. What exhibitions of ingenuity! What variety of invention! What astonishing results! Lowell and Patterson and Pittsburg, each a living trophy of the achievements of man over the powers of nature, or rather of his achievements in alliance with the powers of nature. Yet what are these three illustrations? The number of such is innumerable. Look at the whole state of Ohio, the growing, gigantic embodiment of practical, intellectual energy applied to the arts of industry. Nor can any limits be assigned to this progression, nor any restrictions be put upon the variety of its developments. The whole world of material things lies subject to the controlling hand of man, when his inquiring mind has discovered the laws of nature; and what can hold back the free spirit from its incessant investigations? But in a slaveholding community there is no such progression, no such variety. The mind of the community is directed to other things than labor; nay, labor falls into contempt and is looked upon as derogatory; for it is _servile_ to labor. How can society, under such circumstances, advance in the practical arts? Its industry is confined to one pursuit, and in that there can be no excellence attained, because slave labor is not imbued with intelligence. Evidently, such a social state can not be fitted for permanence; it is not in harmony with the laws of social existence and progress. Things can not be in a wholesome condition where it is discreditable to work, since with labor is conjoined every valuable attainment, including soundness of mind and body. It must doubtless, sooner or later, come to pass that the soil of the Atlantic cotton growing States, worn out by servile culture, will be unable to sustain Slavery by the side of the competition of the rich alluvial lands of the south western portions of the Mississippi valley. Georgia and the Carolinas, not to mention Virginia, where Slavery must cease at an earlier date than in the more southern States, will find it necessary to fall upon some other occupation besides cotton growing. They must cultivate the vine, breed silk worms, rear the olive, turn to account their manufacturing facilities--these, or other such things, the inhabitants there must do if they would save the land from depopulation. There is but one element in the agriculture of Maryland to which Slavery is attached with any affinity; and that is the Tobacco culture. Nor is this affinity of a very binding nature. Tobacco can be grown very successfully by free labor, as the statistics of Ohio demonstrate. One result of the abolition of Slavery in this particular, would be the subdivision of large plantations into small farms.