In such matters as the exhaustion of the soil, and the reckless waste of wood, our present practice will certainly be reformed. There will be great improvements in agricultural chemistry, necessitated by the disappearance of animal manure. The obsolescence of the horse is already in sight; probably we ourselves shall see the day when the horse will cease to be employed except in the organised material of war: and as soon as we cease to eat animals we shall cease to herd cattle, sheep and poultry. But some means will have to be found for returning to the soil the materials we take out of it. Of course the idiotic wastefulness of many systems of sewage disposal, and the dangers, inconveniences and degrading occupations associated with existing alternatives, will be rectified. By improved agricultural methods, lands at present unutilised will be brought under cultivation: and the wasteful and selfish reservation of game preserves, deer forests and excessive pleasure-grounds will have to be abolished--not by legislative enactment, but probably by spontaneous social developments; by the natural development, in short, of economy in the world's possessions. A hundred years hence we shall cease to behave as though the resources of the planet were illimitable and could be wasted at will. In the succession of the ages the spendthrift will have given birth to the miser, reversing the usual order of generations. No doubt the attention concentrated upon agriculture as a consequence of the greatly increased use of vegetable and cereal foods will have, as one of its consequences, the discovery of new means for improving all sorts of crops--means of which even the wonderful achievements of the scientific agriculture of the present day do not contain even the first germs. We shall also, perhaps, find means for avoiding the terrible losses and wastage entailed by climatic accidents. At all events, irrigation will be perfected, and probably we shall be able by acclimatisation and modification to find uses for crops that will flourish during that portion of the year when, in temperate climates, the land at present lies idle. This will both stimulate and further necessitate the improvements in agricultural chemistry already mentioned.