Some trees and plants, from which dyes are made, have the coloring stuff in the bark or wood. That is the way with the logwood tree. The best black dye is made from that. You have seen how much dark red juice you can find in berries. Did you ever squeeze out the red juice of poke or elder berries? It is like red ink. Did you ever notice how strawberries stain your fingers red? Grapes and blackberries make your lips and tongue purple. No doubt you have often had your hands stained brown, for days, from the husks of walnuts. All these facts will show you what a deal of color is taken up from the soil by plants, changed by the sun, and stored up in their different parts. But the chief of all color in the plant is the leaf-green. We cannot make a dye out of that. Leaf-green is the color of which there is the most. It is the color which suits the eye best of all. How tired we should be of crimson or orange grass! Though leaves and stems are generally green, there are some plants which have stems of a bright red or yellow color. Yellow is the common color for stamens and pistils. In some plants, as the tulip, the peach, and others, the stamens are of a deep red-brown, or crimson, or pink, or even black color. LESSON IX. THE MOTION OF PLANTS. If I ask you what motion plants have, I think you will tell me that they have a motion upward. You will say that they “grow up.” You will not say that they move in the wind. You know that that is not the kind of motion which I mean. Some plants grow more by day, some by night. On the whole, there is more growing done by day than by night. At night it is darker, cooler, and there is more moisture in the air. The day has more heat, light, and dryness. For these causes growth varies by day and by night. Warmth and moisture are the two great aids to the growth of plants. Heat, light, and wet have most to do with the motion of plants. For the motion of plants comes chiefly from growth. The parts of the plant the motion of which we shall notice, are, the stems, leaves, tendrils, and petals. Perhaps you have seen the motion of a plant stem toward the sunshine. Did you ever notice in house plants, that the leaves and branches turn to the place from which light comes to them? Did you ever hear your mother say that she must turn the window plants around, so that they would not grow “one-sided”? Did you ever take a pot plant that had grown all toward one side, and turn it around, and then notice it? In two or three weeks you would find the leaves, stems, branches, bent quite the other way. First they lifted up straight. Then they slowly bent around to the light. Perhaps you have noticed that many flower stems stoop to the east in the morning. Then they move slowly around. At evening you find them bending toward the west. This is one motion of stems. Another motion is that of long, weak stems, such as those of the grape-vine or morning-glory. They will climb about a tree or stick.