We must not be accused here of running to extravagance. It is not stated that all human brains are of equal power or can be developed to equal power. It is stated that all human brains of unusual power are brains that are well-nourished by the testicular secretions, and it is implied, with full understanding of what this statement leads to, that if, for any reason, there is an interference with this sex-gland activity, the unusual brain will cease in a short time to be unusual in its power, grasp, and faculty of clear, continuous thought. Similarly it is stated that if this unusual brain, after losing its power of sustained thinking, is again fed by the renewed activities of the sex-glands, it will re-establish its power, and the mind will display its former brilliance. You see how amazing and far-reaching is the application of this apparently simple theory that sex-energy is the basis of all human energy. It is, after all, only another way of saying that all things proceed from a common source, that Life is One, that Mind and Body derive from the same source, that energy is so much an integral of matter, that in the final analysis matter is only static energy; since the atom is made of molecules, and molecules of electrons, and electrons of electricity, or energy. In saying, therefore, that sex-energy is at the basis of all human energy we may quite possibly be trending towards a solution of the world-old question of what Life itself is. Some day, without a doubt, we shall surprise this secret at its source. At present we are fortunate to have discovered, through Dr. Brinkley's careful proving of his theory, that human energy, no matter whether its manifestation be physical or mental, has a common base of supply, the sex-glands, and that their activity determines a brilliant mentality, or a dull brain; a state of health, or a state of disease; beauty of form and feature and skin, or wrinkles, sallowness and ugliness. These appearances and qualities are phenomena which have the same source, or base. Many have felt this to be true. Dr. Brinkley alone has had the wit and skill to find the means to solve the problem as it should be solved to be of any value to humanity, namely, to discover how the inactivity can be changed to activity, how the blood of man and woman can be charged anew with the life-giving hormones, perhaps, or whatever may be the name of that substance secreted by the sex-glands and used by the blood to nourish all the cells of the body, which MUST be present in the system if body and mind are to continue to function at their best. [Illustration: DR. AND MRS. BRINKLEY] CHAPTER II THE PRACTICE. MEN