The capacity for physical exertion is augmented, as has been demonstrated by soldiers on the march, and by experiments with the ergograph. Dr. Campbell said he was forced to disagree with that statement. This he regarded as due to stimulation of the highest or controlling functions of the brain, caffeine acting on the same parts as are first affected by alcohol, but by altering them in the opposite direction. Yet Dr. Campbell agreed that the textbooks cited in cross-examination by the Respondent were reputable. There is a definite conflict.
Degrees are always arguable.
Dr. Campbell said that when one is driving a car and is tired, if he stops for a cup of coffee he gets a lift. If one is tired and takes a cup of coffee which in the testimony was described as containing from 100 to 150 milligrams of caffeine, one gets a lift mentally and physically. That lift as indicated is within a short time. How short a time and how great a lift may depend upon the person. The Postmaster General is not precluded from ascertaining the existence of the agency in any other legal way satisfactory to him.