What would happen then, you may guess for yourself, from what you see happen whenever the land is left to itself, as it is in the wood above. In that wood you can still see the grass ridges and furrows which show that it was once ploughed and sown by man; perhaps as late as the time of Henry the Eighth, when a great deal of poor land, as you will read some day, was thrown out of tillage, to become forest and down once more. And what is the mount now? A jungle of oak and beech, cherry and holly, young and old all growing up together, with the mountain ash and bramble and furze coming up so fast beneath them, that we have to cut the paths clear again year by year. Why, even the little cow-wheat, a very old-world plant, which only grows in ancient woods, has found its way back again, I know not whence, and covers the open spaces with its pretty yellow and white flowers. Man had conquered this mount, you see, from Madam How, hundreds of years ago. And she always lets man conquer her, because Lady Why wishes man to conquer: only he must have a fair fight with Madam How first, and try his strength against hers to the utmost. So man conquered the wood for a while; and it became cornfield instead of forest: but he was not strong and wise enough three hundred years ago to keep what he had conquered; and back came Madam How, and took the place into her own hands, and bade the old forest trees and plants come back again--as they would come if they were not stopped year by year, down from the wood, over the pastures--killing the rich grasses as they went, till they met another forest coming up from below, and fought it for many a year, till both made peace, and lived quietly side by side for ages.
Another forest coming up from below? Where would it come from?
From where it is now. Come down and look along the brook, and every drain and grip which runs into the brook. What is here?
Seedling alders, and some withies among them.
Very well. You know how we pull these alders up, and cut them down, and yet they continually come again. Now, if we and all human beings were to leave this pasture for a few hundred years, would not those alders increase into a wood? Would they not kill the grass, and spread right and left, seeding themselves more and more as the grass died, and left the ground bare, till they met the oaks and beeches coming down the hill? And then would begin a great fight, for years and years, between oak and beech against alder and willow.
But how can trees fight? Could they move or beat each other with their boughs?
Not quite that; though they do beat each other with their boughs, fiercely enough, in a gale of wind; and then the trees who have strong and stiff boughs wound those who have brittle and limp boughs, and so hurt them, and if the storms come often enough, kill them. But among these trees in a sheltered valley the larger and stronger would kill the weaker and smaller by simply overshadowing their tops, and starving their roots; starving them, indeed, so much when they grow very thick, that the poor little acorns, and beech mast, and alder seeds would not be able to sprout at all. So they would fight, killing each other's children, till the war ended--I think I can guess how.
How?
The beeches are as dainty as they are beautiful; and they do not like to get their feet wet. So they would venture down the hill only as far as the dry ground lasts, and those who tried to grow any lower would die. But the oaks are hardy, and do not care much where they grow. So they would fight their way down into the wet ground among the alders and willows, till they came to where their enemies were so thick and tall, that the acorns as they fell could not sprout in the darkness. And so you would have at last, along the hill-side, a forest of beech and oak, lower down a forest of oak and alder, and along the stream-side alders and willows only.
And that would be a very fair example of the great law of the struggle for existence, which causes the competition of species.
What is that?
Madam How is very stern, though she is always perfectly just; and therefore she makes every living thing fight for its life, and earn its bread, from its birth till its death; and rewards it exactly according to its deserts, and neither more nor less.
And the competition of species means, that each thing, and kind of things, has to compete against the things round it; and to see which is the stronger; and the stronger live, and breed, and spread, and the weaker die out.
But that is very hard.
I know it, my child, I know it. But so it is. And Madam How, no doubt, would be often very clumsy and very cruel, without meaning it, because she never sees beyond her own nose, or thinks at all about the consequences of what she is doing. But Lady Why, who does think about consequences, is her mistress, and orders her about for ever. And Lady Why is, I believe, as loving as she is wise; and therefore we must trust that she guides this great war between living things, and takes care that Madam How kills nothing which ought not to die, and takes nothing away without putting something more beautiful and something more useful in its place; and that even if England were, which God forbid, overrun once more with forests and bramble-brakes, that too would be of use somehow, somewhere, somewhen, in the long ages which are to come hereafter.
And you must remember, too, that since men came into the world with rational heads on their shoulders, Lady Why has been handing over more and more of Madam How's work to them, and some of her own work too: and bids them to put beautiful and useful things in the place of ugly and useless ones; so that now it is men's own fault if they do not use their wits, and do by all the world what they have done by these pastures--change it from a barren moor into a rich hay-field, by copying the laws of Madam How, and ****** grass compete against heath. But you look thoughtful: what is it you want to know?
Why, you say all living things must fight and scramble for what they can get from each other: and must not I too? For I am a living thing.