than in the definitions of economic writers, arise from two facts—first, that certain classes of things, the possession of which to the individual is precisely equivalent to the possession of capital, are not part of the capital of the community; and, second, that things of the same kind may or may not be capital, according to the purpose to which they are devoted.
With a little care as to these points, there should be no difficulty in obtaining a sufficiently clear and fixed idea of what the term capital as generally used properly includes; such an idea as will enable us to say what things are capital and what are not, and to use the word without ambiguity or slip.
Land, labor, and capital are the three factors of production. If we remember that capital is thus a term used in contradistinction to land and labor, we at once see that nothing properly included under either one of these terms can be properly classed as capital. The term land necessarily includes, not merely the surface of the earth as distinguished from the water and the air, but the whole material universe outside of man himself, for it is only by having access to land, from which his very body is drawn, that man can come in contact with or use nature. The term land embraces, in short, all natural materials, forces, and opportunities, and, therefore, nothing that is freely supplied by nature can be properly classed as capital. A fertile field, a rich vein of ore, a falling stream which supplies power, may give to the possessor advantages equivalent to the possession of capital, but to class such things as capital would be to put an end to the distinction between land and capital, and, so far as they relate to each other, to make the two terms meaningless. The term labor, in like manner, includes all human exertion, and hence human powers whether natural or acquired can never properly be classed as capital. In common parlance we often speak of a man's knowledge,
