Whether right or wrong, the birth control movement has moved forward from the shadows of guarded discussion into the limelight of medical, social and even religious publicity. Some of our profession are enthusiastic supporters of the movement, some are apathetic, some opposed, and many, though recognizing the justifiability of contraception in many instances, deplore the fact that a problem so individual should have assumed the proportions of a mass propaganda. With many patients the undesirability of further pregnancies is inextricably complicated by the factor of religion. With such patients continence alone has heretofore appeared to be the price demanded for safety from the possibility of pregnancy, and no one could be so religiously blind as to believe that this price has always been paid. The first purpose of this paper is to evaluate briefly, with a minimum of citation from the now voluminous literature, the status of a biologic means