social well-being, presents a birth-rate below 30 per 1,000. We also find that every country in Europe in which the mass of the people are primitive, ignorant, or in a socially unsatisfactory condition (even although the governing classes may be progressive or ambitious) shows a birth-rate above 30 per 1,000. France, Great Britain, Belgium, Holland, the Scandinavian countries and Switzerland are in the first group. Russia, Austro-Hungary, Italy, Spain and the Balkan countries are in the second group. The German Empire was formerly in this second group but now comes within the first group, and has carried on the movement so energetically that the birth-rate of Berlin is already below that of London, and that at the present rate of decline the birth-rate of the German Empire will before long sink to that of France. Outside Europe, in the United States just as much as in Australia and New Zealand, the same great progressive movement is proceeding with equal activity. The wide survey of the question of birth limitation here taken may seem to some readers unnecessary. Why not get at once to matters of practical detail? But, if we think of it, our wide survey has been of the greatest practical help to us. It has, for instance, settled the question of the desirability of the adoption of methods of preventing conception and finally silenced those who would waste our time with their fears lest it is not right to control conception. We know now on whose side are the laws of God and Nature. We realise that in exercising control over the entrance gate of life we are not only performing, consciously and deliberately, a great human duty, but carrying on rationally a beneficial process which has, more blindly and wastefully, been carried on since the beginning of the world. There are still a few persons ignorant enough or foolish enough to fight against the advance of civilisation in this matter; we can well afford to leave them severely alone, knowing that in a few years all of them will have passed away. It is not our business to defend the control of birth, but simply to discuss how we may most wisely exercise that control.