3d. A third point, not only of difference, but also of antagonism between slave society and free, consists in the permanent contraction or limitation of the field of labor in the former, and its perpetual expansion and multiplication of the branches of industry in the latter. Not only does the slave perform as little work as he can with safety, but besides this, the sphere in which slave labor can be profitably employed is a limited one. Agriculture on an extensive scale, on large plantations, is the only one that the slaveholder finds to repay him. All articles, or the vast majority of them, used by the South, that require for their production a great number of different and subdivided branches of labor, come from the North. We have said that labor, skilled, honored, educated labor, is the material foundation, the solid ground upon which free institutions rest. We now further add this undeniable and important truth, viz., that as branches of labor are multiplied; as each branch itself is subdivided and diversified; as new branches and new details are established by the aid of the ever-increasing light of scientific discovery, and the exhaustless fertility of human inventive genius; as all these numerous industries are more or less connected and interlocked; as this great network of ever-multiplying and diversified human labors expands its circumference, while also filling up its interior meshes, in the degree that all this takes place, the broader and firmer becomes this industrial foundation for free institutions.