"If we take all into consideration; if we realise the progress made in the gardening culture, and the tendency towards spreading its methods... if we watch the cultural experiments which are being made now—experiments today and realities tomorrow—and ponder over the resources kept in store by science, we are bound to say that it is utterly impossible to foresee at the present moment the limits as to the maximum number of human beings who could draw their means of subsistence from a given area of land, or as to what a variety of produce they could advantageously grow in any latitude."