It is related that when Darwin was confronted with the evidence of this flower as against one of his theories he insisted that such an insect must live—even before it had been discovered! Again, other flowers keep their petals closed, and the petals must be forced apart in order to get the honey by a strong bumblebee. The flowers that are fertilized by the insects are called “insect loving.” Those that are fertilized by the wind are called “wind loving,” etc. The buttercup was thought not to need the insects to carry its pollen to the stigma—it was for some time thought to be what is called self-fertilizing. But the discovery of the small sac of nectar shows that it must have a purpose, and that purpose to attract insects to bring pollen from other father flowers to fertilize the tiny seeds. The stigma is not always ready to accept the pollen, but when it is ready it becomes moist, and in some flowers sticky, which shows it is in condition to accept the pollen or is ready to mate and that the seeds are ready for their development. This condition often lasts only a few hours, but sometimes a few days. The boys had now been taught and had seen how the pollen reaches the baby seeds. They had been taught the importance of the pollen for the growth of the seeds. They had seen that after the pollen reaches the seeds, that they are given new life, that they remain right in their little nest and are nourished by the pistil or mother flower, until they are full grown or matured. Now as this process is the whole object of the individual plant, what happens then? The boys were shown that as soon as the seeds begin to grow, the petals, on the mother flower, begin to wither, and it seemed as if the flower gave of its beauty, form and youth in order that the baby seeds should grow and mature. The boys were then taught that the plant depends on the earth and air for its nourishment, and as the various flowers have various ways of keeping the crawling insects out of their honey sac, so have they different ways of spreading or scattering their seeds after they have matured. If all the seeds of all plants fell right down near the parent plant there might not be nourishment enough to provide all the seeds with food. So again the outsiders assist them as they did in carrying the pollen. This time it is the wind which does much to assist them in this work. The birds, too, eat of the seeds and drop some of them on other ground. The wind serves the milkweed and dandelion; the birds help the fruits, berries, and the “burrs,” help themselves by catching on the clothing of passersby, or the fur and hair of animals.