THE BIOLOGY OF FERTILITY
A. S. PARKES, F.R.S., Ph.D., D.Sc.
C. R. GARCIA, M.D.
Chairman: Lewis L. Engel, Ph.D.
THE CHAIRMAN pointed out that in their papers, Drs. Parkes and García dealt with aspects of animal and human reproductive physiology related to the broad problems of population growth and control.
In introducing Professor Parkes, Marshall Professor of the Physiology of Reproduction, University of Cambridge, Dr. Engel referred to his "keen scientific intuition" and also to his "ability to seek out and solve important problems." Dr. Engel recalled his first meeting with Professor Parkes ("some twenty-five years ago, while on a visit to London") in his laboratory at the National Institute for Medical Research. At that time Dr. Parkes was working on the effect of sex hormones on the plumage of birds. "I was much impressed with the scientific content of his observation as well as the sheer beauty of his test object. It is this blend of keen scientific intuition with the ability to seek out and solve important problems, combined with an appreciation