Stopes, Marie Carmichael — Coital Interlocking - a Physiological Discovery
Mother's Clinic for Constructive Birth Control, 1930. Soft Cover. 6p booklet announcing Stopes discovery of Coital Interlocking - she suggests that the opening cervix may clamp down upon the penis during intercourse - not later confirmed by Masters & Johnson ! Original clean pale green card cover with faint Leplay House Library stamp on front cover. No other marks, clean and tight. Original Edition. One of a number of books I am listing of Marie Stopes and associated material. . Very Good