Now do you think that any man could in any way make sugar from the earth under his feet? He can no more do it than he can make a flower or a leaf.
There are a great many other things made by plants from what they suck up from the earth. I will mention some of them.
Plants make starch, medicines, gums, and perfumes.
Some plants are starch-factories. They make the starch from the sap that comes up from the root, just as the sugar is made. There is starch in every kind of grain, in potatoes, and in many other roots.
Some plants are medicine-factories. Camphor is obtained from the bark and wood of a tree. Opium is found in the different kinds of poppies. There are various bitter medicines that are found in different plants. Castor-oil is obtained from the seeds of a large plant. These, and various other medicines, are made from sap.
Some plants are gum-factories. You have sometimes seen gum on the bark of peach-trees and cherry-trees, when the bark has been wounded in some way. Now there are some kinds of trees in which there is a great deal of gum. The India rubber is a gum that is obtained from some kinds of trees in warm climates. When the bark of these trees is wounded this gum oozes out. It is collected as it flows. It is dried in smoke, and this gives it its dark appearance.
Many plants are perfume-factories, as I told you in Chapter V. The perfumes are made most often in the flowers, but they are sometimes made in the leaves and other parts. You know how fragrant the leaves of the geranium are. Even wood is sometimes fragrant. The sandal-wood is very much so.
Some plants are color-makers. They not only make colors for their own use—that is, to color their flowers—but they make them for us to use. Many of our dyes with which we color cloths come from plants. They are made in the plants from the sap that comes up from the ground. It seems strange that the blue indigo should be made out of what a plant drinks up from the brown, dull earth. But so it is.
The great variety of things made from sap.