The drawback, to all existing spermicidal suppositories is simply their uncertainty, though they are as nearly fool-proof as anything of the kind can be. It is possible that by further research a suppository, physically harmless but of certain action may be discovered, in which case, from its practical and sociological aspect, the problem of birth control will be greatly simplified. It remains, however, a little doubtful whether the chemical principle, however actively spermicidal, will ever dispense with the necessity of some occlusive device. But this is a sphere in which later research may prove of great value, and nothing but a tentative statement is now possible. The statement may, however, be made that if there is one method of Birth Control as to whose harmfulness there is little room for doubt, it is the method of coitus interruptus. In both sexes it gives rise to a condition of chronic anxiety which, nowadays, is far from uncommon. In the absence of local disease any of the above methods of contraception is preferable to this one. The effectiveness of those women’s contraceptives now in vogue is difficult to estimate. There is little doubt that an unduly high estimation of their success has been formed in certain quarters, based on the assumption that in cases of failure, the working woman will promptly report the event to the centre where the contraceptive was obtained. The writer is persuaded that this is often a mistaken assumption, and that many cases of failure pass in consequence unnoted. There is also difficulty in knowing whether the instructions in the adjustment of the occlusive pessary have been adequately followed out. This process is not always easy, and as has been said above, is far from fool-proof. The arguments above advanced will now be considered in their relation to (_a_) the Individual and (_b_) the Race. (_a_) _The Individual._――The arguments relating to the individual are divisible into those applicable to (1) married, and (2) unmarried persons. (1) It is to be noted that some of the contentions advanced on each side apply to the different phases of the married life of the woman. Thus the revulsion of feeling against the use of contraceptives is experienced chiefly by the woman who has had either no children or few children. On the other hand, the woman who has the greatest need for a knowledge of Birth Control is the one who has had many children and desiring no more would probably feel little or no aversion from taking precautions against conceiving them. It appears to the writer that there is no adequate objection to communicating to such a multiparous mother this much needed information.