On Saturday, April 16. 1921, Dr. Brinkley operated on him at the hospital, Milford, Kansas, transplanting the glands of a three-weeks old male goat. He remained in bed Saturday and Sunday, got up and went for an auto drive on Monday, and passed an uneventful week at the hospital, returning to Chicago on Saturday. He experienced a marked increase in mental energy, which might have shown itself also as increased physical energy if it had been put to the test. This feeling of added pep, snap, energy, or what you please to call it, could be psychological in its origin if it were not for the fact that it is continuous, with no set-backs. Every student of psychology is aware that auto-suggestion has the power to bring out latent energy, raise the drooping spirits, and generate a feeling of well-being. But the student, if he is a reasonably close observer, is also aware that these improved states of feeling have an annoying habit of being offset by corresponding periods of depression, and though he may persist in his effort to lift himself out of the black moods with such success that he finally arrives at a higher tone-level mentally, with a corresponding physical improvement, there is indubitably a strong sense of effort needed for this good result. When, therefore, the writer finds himself working long hours day after day with no sense of mental fatigue, but a certain unusual gaiety of heart accompanying the successive days, as if life were on the whole rather a lark, he, being accurately introspective, and not easily deceived into optimistic conclusions, is forced to give the whole credit for this change of spirit to the functioning of the new glands, and he is confirmed in this conclusion by the fact that the high blood pressure, which was noticeable enough before the operation, cannot now, ten days after the operation, be detected by him at all. Ten days is all too short a time in which to write of details in a matter of this importance. He expects to be able to confirm improvement in eyesight by the middle of May, and will be in a position to speak at greater length on the matter after the summer has passed. The intent of this chapter is to give a brief account of something he saw at Dr. Brinkley's hospital during the week of his treatment.