According to his own representations and the testimony of his friends, he was exceedingly methodical in his habits, dividing his time with rigorous system; but we may well feel a little skeptical as to his assertion that he "rarely slept more than four hours," and at one time but three hours and a half. His mental activity and labor, however, in his youth, must have been very great. Apart from his necessary studies and his active and constant participation in the discussions of the Medical Society, he delivered more public addresses, for the Society and on other occasions, "than all the other members of the institution united" (Page 254), besides employing his pen in numerous ephemeral productions for the press. In speaking of his early life in Philadelphia (Page 330) he says: "I was a young man for the scenes in which I had acted; proud and ambitious certainly, and probably not altogether untinctured with vanity.... In truth it is hardly to be denied that, for a time at least, I was somewhat spoiled [by the compliments paid him] on account of my attributes and performances, both mental and corporal.... No wonder, therefore, that I felt, or conceited I felt, a decided superiority to most medical pupils, as well as the ordinary cast of young physicians.... I certainly did both indulge and manifest it to the extent, at times, of giving serious offense." This was not the worst. His bold self-confidence and assertion having placed him in a position of antagonism toward his friend and preceptor, Doctor Rush, as well as toward other influential medical men of Philadelphia, defeated the great ambition of his life--that of occupying the chair of the Institutes of Medicine in the Medical College of the University of Pennsylvania. When informed by Doctor Rush (Page 290, autobiography) that although his friends spoke in flattering terms of "your talents, attainments, and powers in lecturing and instruction ... they are reluctant to recommend you to the Board of Trustees in the light of a professor," he indignantly declared that "if the door of the University of Pennsylvania was thus closed to him he would soon occupy a chair equally honorable with that of Doctor Rush in some other school." And he shortly thereafter was induced to push his fortunes in the great and growing West.