Marriage, in order to realize the purpose of nature, should be a union founded on mutual love. But this motive is rarely met with unalloyed under present conditions. To the great majority of women, marriage is a means of livelihood that they must obtain at any cost. On the other hand, a great many men regard marriage from a purely commercial point of view, weighing and considering its material advantages and disadvantages. Even those marriages that are not based on selfish, sordid motives, are frequently marred and broken up by the harsh realities of life. Only rarely those hopes are realized that were held by a man and woman prior to their marriage. That is only natural. For in order to lead a contented married life not only mutual love and respect are required, but ~economic security~ as well; that is, a certain measure of the necessities and comforts of life in order to satisfy the needs of man and wife and their children. Material cares and the cruel struggle for existence are destructive to marital contentment and happiness. But these material cares increase with the increasing number of offspring; in other words, ~the better marriage fulfills its natural object, the greater become these cares~. The peasant, for instance, takes pleasure in every new calf that his cow brings forth, he cheerfully counts his suckling pigs and relates the good news of their arrival to his neighbors. But he looks somber when a new baby is added to the number of children that he feels able to support without care--not a large number, forsooth--and he looks doubly somber if the newly-born babe has the ill fortune of being a girl. We may say then that both marriages and births are controlled by economic conditions. This is especially evident in France where agriculture is carried on by a division of the land into small lots, the products of which are not sufficient to support a large family. The famous, or notorious, French system of having no more than two children, a system that has developed into a social institution in France, is the result. In many provinces the population is accordingly almost stationary, while in others there has been a marked decline. The same results that the methods of farming have produced in the rural districts, have been produced in the cities by industry. In fact, the birthrate is declining even more rapidly in the cities.