Page 175.

Those who argue against the proposition, tacitly admit the propriety of the correction relating to the time. For they omit an obvious argument that would be perfectly valid if the correction was not implied; I mean an argument founded on the supposition that the return remaining the same as before, and the advances to labourers remaining the same, the return by the introduction of some improvement, should be yielded at a less interval of time from the period when the advance was made. This, it might then be argued, would not alter the proportional wages, while it would increase the rate of profit per cent. per annum.