The preventive check must be taken to imply moral restraint. But does this mean abstaining from sexual intercourse during the period of marriage after the birth, say, of three children, which may be taken as sufficient to keep the population stationary or moderately progressive? We cannot find that Malthus ever advocated such abstention. We have already seen that he considered six children a normal family, implying the doubling of the population every twenty-five years. Neither is it suggested that six should be the maximum, for he adds: “It may be said, perhaps, that even this degree of prudence might not always avail, as when a man marries he cannot tell what number of children he shall have, and many have more than six. This is certainly true.” (P. 536.) But where does moral restraint come in? This is how he defines it: “Restraint from marriage which is not followed by irregular gratifications may properly be termed moral restraint” (p. 9); and to avoid any possible misunderstanding he adds a note: “By moral restraint I would be understood to mean a restraint from marriage from prudential motives with a conduct strictly moral during the period of this restraint, and I have never intentionally deviated from this sense.” All this is perfectly explicit. He means abstention from all sexual intercourse outside the bonds of marriage, and the postponement of marriage itself until such time as the man can take upon himself the responsibility of bringing up a family—and even the complete renunciation of marriage should the economic conditions never prove favourable. Malthus unceremoniously rejected the methods advocated by those who to-day bear his name, and expressly condemned all who favoured the free exercise of sexual connection, whether within or without the marriage bond, through the practice of voluntary sterilization. All these preventive methods are grouped together as vices and their evil effects contrasted with the practice of moral restraint. Malthus is equally explicit on this point. “Indeed, I should always particularly reprobate any artificial and unnatural modes of checking population. The restraints which I have recommended are quite of a different character. They are not only pointed out by reason and sanctioned by religion, but tend in the most marked manner to stimulate industry.” (P. 572.) And he adds these significant words, so strangely prophetic so far as France is concerned: “It might be easy to fall into the opposite mistake and to check the growth of population altogether.”