The same law operates in the vegetable world. Everywhere plants seem to discover the localities where they thrive best. Even in the same country you have one flora for the valley and another for the mountain. The lichen spreads itself along the surface of rocks, or the hard bark of ancient trees; the fungus tarries in damp, unventilated corners; the primrose settles on open banks; the fern in shady groves. There is always a place for the plant, and a plant for the place. And it is so with animals too. The elephant in the spreading forest, the rabbit in the sandy down, the beaver beside the stream, the caterpillar in the leafy garden. If we could explore the ocean we should find the law of distribution in full activity there. There is one great order of fishes for fresh water, another for salt; one great class of insects in hot climates, another in temperate; birds of the air, from the eagle to the humming-bird, from the ostrich to the bat, in localities adapted to their habits. We ask not whether this result was due to creation or to evolution. There it is, and its effect is to cover the earth. All its localities, desirable and undesirable, are more or less occupied with inhabitants. Some of the great deserts that our imagination used to create in Africa or elsewhere do not exist. Barren spots there are, and "miry places and marshes given to salt," but they are not many. The earth has been replenished, and the purpose of God so far fulfilled. And then there is a distribution of talents. We are not all created alike, with equal dividends of the gifts and faculties that minister in some way to the purposes of our life. We depend more or less on one another; women on men, and men on women; the young on the old, and sometimes the old on the young; persons of one talent on those of another talent, those with strong sinews on those with clear heads, and those with clear heads on those with strong sinews; in short, society is so constituted that what each has he has for all, and what all have they have for each. The principle of the division of labour is brought in; and in a well-ordered community the general wealth and well-being of the whole are better promoted by the interchange of offices, than if each person within himself had a little stock of all that he required.