An assessment of Harvard's contributions to medicine is less a chronology than an introduction to key discoveries and the ideas that made them possible, presented in the framework of medical education. The emphasis is on the men themselves as well as their medicine. Of major concern are the roles played by the University of Pennsylvania Medical School in 1780-1850 and by Johns Hopkins Medical School in 1893-1925. Other topics considered include: the work of President Charles W. Eliot and Dean David Linn Edsall, the Thorndike Memorial Laboratory, August Krogh, the Social Service Department of Massachusetts General Hospital, William Aycock, Henry P. Bowditch, Richard Cabot, Ida P. Cannon, George Cheever, Ernest Amory Codman, Otto Follin, James L. Gamble, James Flexner, Freud, the Rockefeller Foundation, the role of basic science in medical education, and the merit of full-time clinicians in medical schools. (Editor/MSE)