3. POPULATION LIMITED.--Galton, in his great work on hereditary genius, observes that "the time may hereafter arrive in far distant years, when the population of this earth shall be kept as strictly within bounds of number and suitability of race, as the sheep of a well-ordered moor, or the plants in an orchard-house; in the meantime, let us do what we can to encourage the multiplication of the races best {233} fitted to invent and conform to a high and generous civilization." 4. SHALL SICKLY PEOPLE RAISE CHILDREN?--The question whether sickly people should marry and propagate their kind, is briefly alluded to in an early chapter of this work. Where father and mother are both consumptive the chances are that the children will inherit physical weakness, which will result in the same disease, unless great pains are taken to give them a good physical education, and even then the probabilities are that they will find life a burden hardly worth living. 5. NO REAL BLESSING.--Where one parent is consumptive and the other vigorous, the chances are just half as great. If there is a scrofulous or consumptive taint in the blood, beware! Sickly children are no comfort to their parents, no real blessing. If such people marry, they had better, in most cases, avoid parentage. 6. WELFARE OF MANKIND.--The advancement of the welfare of mankind is a most intricate problem: all ought to refrain from marriage who cannot avoid abject poverty for their children; for poverty is not only a great evil, but tends to its own increase by leading to recklessness in marriage. On the other hand, as Mr. Galton has remarked, if the prudent avoid marriage, while the reckless marry, the inferior members will tend to supplant the better members of society. 7. PREVENTIVES.--Remember that the thousands of preventives which are advertised in papers, private circulars, etc., are not only inefficient, unreliable and worthless, but positively dangerous, and the annual mortality of females in this country from this cause alone is truly horrifying. Study nature, and nature's laws alone will guide you safely in the path of health and happiness. 8. NATURE'S REMEDY.--Nature in her wise economy has prepared for overproduction, for during the period of pregnancy and nursing, and also most of the last half of each menstrual month, woman is naturally sterile; but this condition may become irregular and uncertain on account of stimulating drinks or immoral excesses. [Illustration] {234} The Generative Organs. [Illustration] THE MALE GENERATIVE ORGANS AND THEIR STRUCTURE AND ADAPTATION. 1. The reproductive organs in man are the penis and testicles and their appendages. 2. The penis deposits the seminal life germ of the male. It is designed to fulfill the seed planting mission of human life. 3. In the accompanying illustration all the parts are named.