XI

produced by a field of rice, and much superior to what is produced by a field of wheat. Twelve thousand weight of potatoes from an acre of land is not a greater produce than two thousand weight of wheat. The food or solid nourishment, indeed, which can be drawn from each of those two plants, is not altogether in proportion to their weight, on account of the watery nature of potatoes. Allowing, however, half the weight of this root to go to water, a very large allowance, such an acre of potatoes will still produce six thousand weight of solid nourishment, three times the quantity produced by the acre of wheat. An acre of potatoes is cultivated with less expense than an acre of wheat; the fallow, which generally precedes the sowing of wheat, more than compensating the hoeing and other extraordinary culture which is always given to potatoes. Should this root ever become in any part of Europe, like rice in some rice countries, the common and favourite vegetable food of the people, so as to occupy the same proportion of the lands in tillage which wheat and other sorts of grain for human food do at present, the same quantity of cultivated land would maintain a much greater number of people, and the labourers being generally fed with potatoes, a greater surplus would remain after replacing all the stock and maintaining all the labour employed in cultivation. A greater share of this surplus too would belong to the landlord. Population would increase, and rents would rise much beyond what they are at present.