=How sex helps to change a boy into a man.=--We are now able to study how this new life, this vital force, changes a perfect boy into a perfect man. We find that this energy is formed from the blood and contains life. These sperm cells contain physical, mental and soul life. This will be made plain to you, when you learn, that, when one of these sperm cells of a father unites with the cell of a mother, under proper conditions, the result will be a child having physical, mental and soul life. A boy has physical, mental and soul life when he is born, but he has not as much as he will have when he is grown. If he grows up to be a man, he will need more of this energy and life. This is the work of the sexual glands. They form, by the help of the blood, this energy. This energy is absorbed by the body and carried by the blood to every part of his being. It is in this way that this energy helps the body to grow, and the mind and soul to develop. =Two full brother colts.=--The use of this fluid can be illustrated in several ways. If two brother colts grow up side by side, they will look much alike when grown. If one of them be castrated when young, he will not develop as well as the other one. The castrated horse is called a gelding. The other one is called a stallion. The stallion has a high arched neck, dilated nostrils, sparkling eyes, a heavy thick mane and tail, broad, deep hip and chest muscles and an elastic bearing. He commands the attention and admiration of all beholders. A boy can’t manage him. It takes a strong man to control him. Turn him out in the field with one hundred geldings and he will rule all of them. The only difference between these horses was that one had had his testicles removed and the other had not. The gelding could not form from his blood any of this valuable energy. This energy was formed by the stallion and absorbed by his body where it gave him perfect development, an elastic bearing, fiery eyes, strong muscles and lots of vitality.