The Renewal of Life; How and When to Tell the Story to the Young

by Margaret Warner Morley

When the children have found how general is the presence of pollen in the flowers, where it comes from, and how it is gathered by the bees, they can learn that the pollen is valuable to the plant itself. It is indeed one of the most necessary parts of the flower, for without it the ovules could not develop.

The effect of the pollen upon the seeds can be prettily illustrated by a simple experiment. Take two or three little pots of geraniums whose buds are just ready to open. Be sure to have single geraniums, and to stand them where they will not be disturbed and where the wind will not blow upon them. Shortly after the flower opens, the anthers will be seen crowded in its throat and covered with pollen. After a few days the pollen will have dried up, and the style, tipped with a five-rayed star-like stigma, will push up above the anthers. Mark pot No. 1 as untouched. From pot No. 2 carefully take a little pollen on the end of a small clean paint-brush or tooth-pick and touch with it the five-rayed, star-like stigma of the flowers in pot No. 3. Be careful not to let any of it touch the stigmas of the flowers in pot No. 2, the pot from whose flowers the pollen is taken.

Leave the flower-pots undisturbed and watch results. When the flowers finally drop their petals, in pots No. 1 and No. 2 there will be no seed-pods remaining, everything will drop, including the little flower-stalks and the main stalk supporting the whole cluster of flowers. In short, no trace of flowers will be left. So far as seed-forming is concerned, the flowers might as well never have blossomed. Very different will be the result in the flowers of pot No. 3. These received the pollen on the stigma, and in some way this pollen affected the ovules so that they began to develop. We say the flower was fertilized by the pollen, and "fertilized" is a valuable word to learn at once. When the petals of the fertilized flowers fall, all does not fall. There remains the ovary with the long style and the star-like stigma. The ovary continues to grow, as do the seeds within it. Since the geranium is a house-plant, raised under unnatural conditions, not all the fertilized flowers will succeed. Some may fall at once, like the unfertilized ones. But out of the whole bunch of fertilized flowers some will be almost sure to start the development enough to show that in some way the fertilized flowers were able to produce seeds, while the others will in no case make any attempt at seed-forming. Even though none of the seeds come to perfection, the fact that they start at all will demonstrate the effect of the pollen. The geranium is a good plant to use in illustrating this point, because it is so constructed that it cannot fertilize its own flowers.

What the child thus far learns is simply that the pollen is in some way necessary to the development of the ovule. If the experiment with the geraniums is not practicable, the child can be told that the pollen is necessary to the development of the seed, that it falls upon the stigma and nourishes the little ovules down in the ovary, and that no seed can form without the aid of the pollen. All the seeds we plant in the flower gardens or in the vegetable gardens, and all the grain we sow in the fields, are produced by the help of pollen. All the peas and beans and other seeds we eat owe their existence in part to the pollen, and without it they could not develop.

Some parents teach their children at once that the pistil is the mother-part of the plant, caring for the young seeds, the stamens the father part, providing for them, and that the stamens and pistil growing in the same flower are brothers and sisters. Other parents prefer to use only botanical terms, leaving the extension of the thought to later consideration or to the child's own logic, for children often reason out all the facts—in a very general way, of course—from only this botanical study.

But we are not yet done with the pollen. It not only assists the ovule to develop, but it impresses upon it its own characteristics. In other words, the seed inherits from the pollen as well as from the ovule. Inheritance is a very wonderful thing. It is that power which causes the offspring to resemble its parents. In some wonderful way the tiny ovule, the tiny pollen grain, remember everything about the plant they came from and are able to transmit this memory to the developing offspring, so that it may become like its parents.

Again, the child under eight can understand the principal facts of fertilization. The older child can add to his stock of facts, and one of the things he will be likely to want to know is how the little pollen grain up on the stigma can influence the ovule down in the ovary.

We know how the ovule is formed. We know that it grows from the inside of the ovary. If we were able to examine the development of the pollen grain inside the anther from its very beginning, we should find the same thing true of it. The anther is a little box like the ovary, and the pollen grain grows from the inside of it, being at first a part of it and nourished by the same sap. When it became ripe it fell free into the anther cavity. We then have a little box full of ripe pollen grains.[1]

The pollen grain is like the ovule in structure, only much smaller. It is so tiny and the anther so small that we cannot watch its development as we can that of the ovule. But botanists have taken great pains to examine the pollen and to watch its development under the microscope, so that from them we know the truth.

If we examine the young ovule we find it apparently nothing but a little sac full of a semi-liquid substance. This semi-liquid substance, or at least a part of it, is alive and is very important. It is protoplasm, which is the only living substance; all the living parts of plants and animals are made from protoplasm.