Starch and the food taken up by the roots pass through all parts of the plant by the sap tubes, and as the sap goes along, each living cell draws into itself the substances from the sap that it needs, and these it combines into the things it wants to make. Some of the cells in an orange skin, for instance, attract out of the sap the materials to make the fragrant, stinging oil that fills the fresh skin, while other cells attract the materials to build the white cottony covering inside the outer skin, and so the cells in each part of the plant take out what they need to build with.
WHAT BECOMES OF THE FLOWERS?
Early in the spring the snowdrops and crocuses peep out, and then they go away.
We do not think much about it, for other flowers have come in their places.
Spring beauties and bloodroots shine in the woods, and then they go away. But the mandrakes have come with their umbrella leaves, and then the columbines and roses ask for a welcome.
After awhile we can find no more mandrakes and columbines, only yellow apples and brown seed-pods.
Jack-in-the-Pulpit jumps up quite early in the summer, and then we cannot find him, only in the late summer we sometimes come across little clusters of bright red berries lying on the ground.