In the strictest sense, accordingly, there is no such thing as physical labor, because the mental must coöperate with the physical even in the lowest forms of human exertion; and in the same sense there can be no such thing as exclusively mental labor, for the bodily powers conspire more or less in the highest intellectual efforts that are ever sold. Nevertheless, both the phrases, physical labor and mental labor, are convenient and not harmful, whenever on the one side the bodily powers seem to be predominant in the effort, and on the other the intellectual.

It is now to be noticed, that all that men can do, when they labor physically, is to move something. When a man works with his hands or his feet or his whole body, all that he does or can do, is to begin a series of motions or resistances to motion, for this good reason, human muscles in their very structure are capable only of starting motion and stopping motion. All the marvellous results of physical effort in all the world have flowed from so simple a matter as the contraction and expansion of muscle; and the world of materials is so cunningly constructed, that, when these are moved into right position by human hands, or by some form of capital itself the result of previous human handling, the free powers of Nature do all the rest, and valuable commodities are the good outcome. For one example, when the woodman fells a tree for sale, he brings a series of motions (labor) to bear upon the trunk, by means of his sharp axe (capital), and then the power of gravitation (nature) seizes the tree and brings it crashing to the earth. For a second illustration, wool and cotton have by nature a certain tenacity of fibre, and what is more to the point, a certain kinkiness of fibre easily interlinking one with another indefinitely in length; men move these separate fibres in certain relations to each other by an instrument (capital) called a spindle, and the result is thread; then other men move these threads into relations with each other by means of an implement (capital) called a shuttle, and the outcome is a web of cloth; lastly, the tailor moves his shears through the cloth, and then his needles, and the issue is a coat, a commodity, the valuable for which all these processes were gone through with, and by the sale of which all the onerous factors therein are compensated.

Now, since human muscles are soon wearied in action, and since motion is the only thing required of men in the production of commodities, they naturally look around for outside help in this matter; and the first help they lighted on for moving things was the domestic animals, the ox and ass and horse, doubtless domesticated in the very beginnings of society; and as these can be used in so many different places, and for such a variety of purposes, and are so cheaply reared, they are exceedingly useful as a motive power, and will probably never be superseded as such. Inanimate auxiliaries in moving things into right position for the production of commodities, such as the water-wheel and wind-mill, were undoubtedly brought into use much later; and much later still, steam and electricity and other more subtle and recondite natural agents. All of these helps, whether animate or inanimate, do but cause simple motions of the same kind as those caused by the human hand. The most ponderous engine merely reduplicates that which the arm of a child is capable of; while in point of delicacy and firmness of touch, perhaps no machinery can subdivide and apply this motion so skilfully as the human fingers can. It is said that some of the lace made wholly by hand is finer and more delicate than any yet woven by machinery, although the introduction of machinery into lace-making has cheapened lace products in general to a small fraction of their former cost.

What we commonly call "Power," then, by whatever instrumentality furnished, is simple auxiliary motion, additional to that of physical human Labor. Commodities are produced in unlimited quantity and variety by such labor, assisted by the free forces of nature applied by means of animals and implements, which are capital. But such labor is irksome as well as wearisome, and is never expended except in view of a reward, which is secured only from the sale of the finished commodity.

(c) Reserved Capital. We must examine the nature of Capital with care, and follow its varied forms without confusion, because it is the only other factor besides labor in the production of commodities, that has to be paid for out of their sale.

Simplest cases are always the best in economical discussions. Let us take for illustration a recently observed case from the gold hills of North Carolina. All the methods are strongly primitive, but all the elements of production are present. A negro woman is the laborer, the bits of gold scattered in the soil are the free gift of nature, a bored log to divert the water from the mountain stream, and a tin pan in which to gather and wash the sand and gravel, are two crude forms of capital; free gravitation also brings the water through the log, and free gravity carries down the particles of gold to the bottom of the washing-pan, and many other agencies of free nature coöperate in this very simple case of production; and besides the log and the pan, there are doubtless some other forms of capital, at least the whittled plug to stop at need the flow of water through the log. The chief factor in these processes of production is still the laborer, the motions of her hands in stirring the sand and picking out the precious bits at the bottom of the pan are the chief motions, the labor is both physical and mental,—no animal could be trained to adopt means to ends like this negro woman.

It is her capital that now engages our attention. Any Valuable outside of man himself reserved to assist in the production of further valuables is Capital. The idea of growth and increase inheres in the very word, which is derived from the Latin noun, caput, a head, a source, and gives intimation in its etymology of its scientific meaning. The word, caput, is often used in classical Latin for a sum of money put out at interest, and its derivative, capitale, is also used in the same sense, at least in mediæval Latin; and from this form of the word have come into English not only Capital, but also by corruption Cattle and Chattels. Flocks and herds were at one time the principal riches of our Saxon ancestors, and also the principal means of increasing their riches, and in process of time the same root-word came to be spelled differently as applied to animate or inanimate things of value; while the notion implied in the Latin caput, and in the English source, came along in all three of these words; and hence the careful definition of Capital above given.

It makes no difference whether the colored woman bored her own log by means of an item of capital already existing, namely, an auger, or hired another person to bore it for her, or bought the log already perforated, it is an article of Capital, a valuable kept to increase future valuables; she might doubtless sell it for something to a new-comer wishing to operate other sand in the neighborhood, but she keeps it to help herself gather more gold for ultimate sale, she practises what we call in Economics abstinence and must have her reward for this in the form of profits from the ultimate sale of her commodity, gold, as well as a reward for her labor in the form of wages from the same source. As one person furnishes both the labor and capital in this case, there is no actual division of the gross return into wages and profits, as there always must be when separate parties furnish the two essential factors, both of which must be remunerated by the sale of the commodity. What is thus true of the log, is equally true of the tin-pan, and even of the plug also, if it be capable of repeated use and cost something of labor and the help of a previous item of capital, namely, the jack-knife. Our negro woman of the South is a small capitalist as well as a rude laborer, and practises abstinence as well as puts forth exertion, and consequently is entitled to receive profits as well as wages in the return she gets for her gold-dust when she sells it.

We are now beginning to see what the nature of Capital is, and what the motives are for employing it. In the production of commodities Capital is always something that makes easier to the producers the getting ready to sell and the selling of future commodities. The capital always spares more or less of onerous and irksome human exertion. It always mediates between some free force of Nature and some otherwise more onerous effort of men. The sole motive to employ capital in any one or in all of its multitudinous forms from the simplest to the most complex is to throw off upon the ever-willing shoulders of Nature some part of the irksome effort that would otherwise come to the easily-wearied muscles of men. Nature is "good," to use a commercial term, for all she can be made to carry of men's work, through implements devised and machinery contrived to apply, to commodities in every stage of their transformation and transportation till the last, the ever-present potencies of this physical world. These potencies cost nothing. The implements and machinery cost much in present labor and previously created capital. The ultimate sale of commodities must make return for all the forms of capital employed in their production, in the shape of Profits, the reward of abstinence; and for all the forms of direct labor employed in their production, in the shape of Wages, the reward of personal effort.

The beaver gnaws down the tree with his teeth from generation to generation in precisely the same manner; but man is a being more nobly endowed than the beaver, and no sooner had he occasion to fell trees, than something of the nature of an axe suggested itself to his ingenuity. It is true, that his earliest attempts at axe-making were probably of the rudest sort, but just as soon as anything was devised, whether of flint or shell or metal, that rendered easier the felling of a tree, Capital made a beginning along that line of obstacles. Our chief interest in studying the implements of the successive so-called Ages of Stone and Bronze and Iron, is to witness the increasing degrees of ingenuity displayed by those pre-historic men. Among the more gifted races, progress in this direction was perhaps more rapid than we are wont to think it was, since Tubal-Cain, the first artificer of record, is said to have "hammered all kinds of implements out of copper and iron" (Gen. iv, 22). Lucretius, writing in the century before the Christian era, put down the following lines in vigorous Latin, as translated by Mason Good:—