The falling of the leaf is not an accident, nor is it dependent upon the wind; when the time comes, the leaves go down, wind or no wind, though doubtless the wind helps them. When they are fully ripe, the leaves let go! The cells that connect the leaf stem with the branch shrivel and shrink until the leaf is entirely separated from the parent plant; when this happens, the leaf falls. The ripe leaf is less juicy than the young leaf; its juices have departed and left the stiff, lifeless framework and the hardened skin, with the emptied cells beneath, to find their way to the earth.
But while the trees and bushes, the bulbs and underground stems store away the living part of the plant, what about the morning-glories and nasturtiums? They do not send their living part into roots or stems, for they do not grow again another year. What now becomes of them?
They die, you say. I do not say that. I say they change. Of course the seeds live on. The morning-glory seeds, and the seeds of all the plants that grow wild in a climate like ours, are not hurt by the cold.
You very well know that some of the life of the plant is folded up in the seeds. But the vines and leaves seem to be hurt by the cold. They fall limp to the ground. They change. The little particles of which they are made let go of each other; they unite with other particles in new ways. They float off in the air as gases.
These gases are carried about by the wind and meet new plants, which build them into their leaves and stems.
Part of the particles in the frosted vine do not become gases; they let go of other particles and sink down as minerals, to be taken up by plant roots another season. Other parts lie on the earth in the form of rich vegetable mould, which is also taken and built into new plants. So when our morning-glory or nasturtium vine disappears, it is not lost; it has only changed its form.
Instead of being a nasturtium, its particles may find themselves built into a dozen different plants.
So what we call death is only change. Not an atom of any plant is lost.
Besides, if no plants changed back again into gases and minerals, there could be no growth and no flowers in the world. There would be no material to make new plants, and no room for new plants to grow.