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Notes
This investigation was supported by a research grant, B‐2356, from the National Institute of Neurological Diseases and Blindness, Public Health Service.
I am extremely grateful to have received the vigorous comments which Dr. George Hagy, Dr. Sidney Goldstein, and Dr. Kurt Mayer provided for an earlier draft of this manuscript. I also derived considerable benefit from the discussions following a presentation of this paper to the Seminar, Genetics and the Evolution of Man, at Columbia University.