Noting these and many other phenomena, as many had done before him, Dr. Brinkley concluded that the testes of the male and the ovaries of the female performed corresponding offices for each sex, generating the vital fluids which, when not fulfilling their primary object of reproducing the species, were turned back into the blood and absorbed by the tissues for the benefit of the individual's physical and mental processes. Normal activity of the secretions of the sex-glands, therefore, meant, in Dr. Brinkley's opinion, right nourishment for all the cells of the body, and right functioning of all the organs of the body. The strength and speed of the stallion in health were as much due to the right action of the sex-glands as his full-arched neck, his blazing eye, or his thick mane and tail. And since the capon and the eunuch acquired a cowardice that avoided fatigue, effort, or conflict, it was clear that the mental qualities were as directly influenced by the testicular secretion as the physical. It followed that the well-nourished brain, capable of sustained concentration and clear thinking, must necessarily be the brain that was fed by the normal activity of the sex-glands, and it also followed that since youth in man and woman is the time of matured beauty of face and form in man and woman, when sexual secretions are of normal activity, therefore, the sexual secretions were mainly responsible for the development of matured beauty of face and form. From this it was clear and evident that the haggard face, the lined face, the over-thin or the over-fat body, phemonena familiar to all of us in men and women who have passed their youth, were due in the main to lack of nourishment of the body-cells by the seminal fluid, with lack of proper functioning of the organs, and resultant lack of proper elimination of waste matter from the system, producing that condition of slowing-down of the machine which is a part of the aging process of the body and mind of man and woman, as seen in all men and all women today. It is important always that you realize that though we may seem to stress the physical improvement in human beings brought about by this gland-transplantation, the more important change of the two is the mental, and Dr. Brinkley's theory that ALL ENERGY IS SEX-ENERGY means exactly that the powerful brain equally with the beautiful face owes its strength and vigor exactly to the right functioning of the sex-glands.