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business admits of the utmost subdivisions of labour, the quantity of materials which they can work up, increases in a much greater proportion than their numbers. Hence arises a demand for every sort of material which human invention can employ, either usefully or ornamentally, in building, dress, equipage, or houshold furniture; for the fossils and minerals contained in the bowels of the earth, the precious metals, and the precious stones.

Food is in this manner, not only the original source of rent, but every other part of the produce of land which afterwards affords rent, derives that part of its value from the improvement of the powers of labour in producing food by means of the improvement and cultivation of land.464

Those other parts of the produce of land, however, which afterwards afford rent, do not afford it always. Even in improved and cultivated countries, the demand for them is not always such as to afford a greater price than what is sufficient to pay the labour, and replace, together with its ordinary profits, the stock which must be employed in bringing them to market. Whether it is or is not such, depends upon different circumstances.

Whether a coal-mine, for example, can afford any rent, depends partly upon its fertility, and partly upon its situation.

A mine of any kind may be said to be either fertile or barren, according as the quantity of mineral which can be brought from it by a certain quantity of labour, is greater or less than what can be brought by an equal quantity from the greater part of other mines of the same kind.

Some coal-mines advantageously situated, cannot be wrought on account of their barrenness. The produce does not pay the expense. They can afford neither profit nor rent.

There are some of which the produce is barely sufficient to pay the labour,465 and replace, together with its ordinary profits, the stock employed in working them. They afford some profit to the undertaker of the work, but no rent to the landlord. They can be wrought advantageously by nobody but the landlord, who being himself undertaker of the work, gets the ordinary profit of the capital which he employs in it. Many coal-mines in Scotland are wrought in this manner, and can be wrought in no other. The landlord will allow nobody else to work them without paying some rent, and nobody can afford to pay any.

Other coal-mines in the same country sufficiently fertile, cannot be wrought on account of their situation. A quantity of mineral sufficient to defray the expense of working, could be brought from the mine by the ordinary, or even less than the ordinary quantity of labour: But in an inland country, thinly inhabited, and without either good roads or water-carriage, this quantity could not be sold.

Coals are a less agreeable fewel than wood: they are said too to be less wholesome. The expense of coals, therefore, at the place where they are consumed, must generally be somewhat less than that of wood.

The price of wood again varies with the state of agriculture, nearly in the same manner, and exactly for the same reason, as the price of cattle. In its rude beginnings the greater part of every country is covered with wood, which is then a mere incumbrance of no value to the landlord, who would gladly give it to anybody for the cutting. As agriculture advances, the woods are partly cleared by the progress of tillage, and partly go to decay in consequence of the increased number of cattle. These, though they do not increase in the same proportion as corn, which is altogether the acquisition of human industry, yet multiply under the care and protection of men; who store up in the season of plenty what may maintain them in that of scarcity, who through the whole year furnish them with a greater quantity of food than uncultivated nature provides for them, and who by destroying and extirpating their enemies, secure them in the free enjoyment of all that she provides. Numerous herds of cattle, when allowed to wander through the woods, though they do not destroy the old trees, hinder any young ones from coming up, so that in the course of a century or two the whole forest goes to ruin. The scarcity of wood then raises its price. It affords a good rent, and the landlord sometimes finds that he can scarce employ his best lands more advantageously than in growing barren timber, of which the greatness of the profit often compensates the lateness of the returns. This seems in the present times to be nearly the state of things in several parts of Great Britain, where the profit of planting is found to be equal to that of either corn or pasture. The advantage which the landlord derives from planting, can nowhere exceed, at least for any considerable time, the rent which these could afford him; and in an inland country which is highly cultivated, it will frequently not fall much short of this rent. Upon the seacoast of a well-improved country, indeed, if coals can conveniently be had for fewel,466 it may sometimes be cheaper to bring barren timber for building from less cultivated foreign countries, than to raise it at home. In the new town of Edinburgh, built within these few years,467 there is not, perhaps, a single stick of Scotch timber.

Whatever may be the price of wood, if that of coals is such that the expense of a coal-fire is nearly equal to that of a wood one, we may be assured, that at that place, and in these circumstances, the price of coals is as high as it can be. It seems to be so in some of the inland parts of England, particularly in Oxfordshire, where it is usual, even in the fires of the common people, to mix coals and wood together, and where the difference in

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