emphasize the point that the pith and marrow of Dr. Brinkley's discovery is that since it is clearly shown that rejuvenation is accomplished by the restoration of activity to the sex-glands, therefore the preservation of this rejuvenation MUST depend upon the CONSERVATION of the seminal fluids, and cannot depend upon any other single factor whatever. It has been already explained that Dr. Brinkley puts it out of the power of the rejuvenated man to destroy the good that has come into his life, and protects him against the danger of yielding too freely to passionate impulse, by preventing the escape of the rejuvenating agent. The means of nourishing the body and brain being therefore insured as to supply, it is not reasonable to suppose that the nerve-cells of the rejuvenated man can fail to receive their proper nourishment for many succeeding years, and, passing by the rat as a fallacious parallel, we cannot see any good reason why the human body and brain, either under the guidance of self-control, or surgically safeguarded against the waste of excess, should not function at their best for fifty years of added life, with very possibly another fifty added to that. The real crux of the matter is the resistive quality of tissue, which is approximately 200 years for such organs as kidneys and heart, and, say, 150 for nerve-substance. [Illustration: THE OPERATING ROOM AT THE BRINKLEY HOSPITAL] CHAPTER VIII A WEEK AT DR. BRINKLEY'S HOSPITAL The writer, approaching the age of 54, and finding himself in first-class physical and mental condition, except for a high blood pressure, which was certainly the prelude to a later arterio-sclerosis, decided that he would be doing himself a service, and put himself in a better position to write with some authority upon the effects of the goat-glands, if he took the operation.