=How the papa and mamma natures unite.=--When the pollen is ripe, the anther cells burst open and the little, light, powdery pollen falls out and it is carried by gravity, the wind or by insects to the stigma. The little pores of the stigma open and admit the grains of pollen and the style carries the pollen to the ovary where it unites with the little seed. The seed are then said to be fertilized. This means that the father and mother natures have united in the seed. The seed grow and develop in the ovary. While this is being done, food for the little baby plants to live on while only a day or two old, is being stored up in the seed. In such seed is the tiny beginning of a future plant. The seed ripen in the pod. The pod bursts open and the seed fall upon the ground, or men gather them, and later plant them in the soil. The spring sunshine and rain cause the seed to sprout and as tiny stems appear above the ground, only an inch or so high, they are nothing in the world but little baby sprigs of grass, little baby weeds, little baby vegetables or little baby trees. When God created the first grasses, plants and trees, He commanded them to be “fruitful and multiply.” In this story you have learned how all the grown-up plants and trees obey this command of God. =The two natures do not always exist in the same flower.=--In the flowers we have studied, we found both the male and female organs in the same flower. Each flower possessed the two natures, male and female. But this is not true of all plants and trees. In some plants and trees flowers can be found having only stamens. These would be father-flowers. They could not produce seed or fruit. On some plants and trees may be found flowers having only pistils. These are mother-flowers. Flowers of these two kinds may be found growing on the same limb of a plant or tree, or on different limbs, or on different trees. The poplar and willow trees are examples of the last kind. In the case of the Indian corn, the ear of corn, including the cob, the grains, shuck and silk form the mother part of the cornstalk. The tassel of the cornstalk is the father part and contains the father nature. The tassel produces a great deal of pollen. You have, on passing through a patch of corn, noticed the pollen falling everywhere and covering everything. Ears of corn sometimes have as many as 1000 grains of corn to the cob. Each grain sends out one or more little silks beyond the shuck to catch some of the pollen. Should these little silks fail to catch the grains of pollen, no grains of corn would form on the cob. The father and mother natures must unite if little seed are formed. From this we learn why it is that every little sprig of grass, weed, vegetable, and tree must have a father and mother and their natures must unite.