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Rh each who survive infancy. On the other hand, those who have the opposite qualities have, on the average, more than two children each, and more than reproduce their own numbers.

It is impossible to estimate the effect which this will have upon the character of the population without a much greater knowledge of heredity than exists at present. But so long as children continue to live with their parents, parental example and early education must have a great influence in developing their character, even if we leave heredity entirely out of account. Whatever may be thought of genius, there can be no doubt that intelligence, whether through heredity or through education, tends to run in families, and that the decay of the families in which it is common must lower the mental standard of the population. It seems unquestionable that if our economic system and our moral standards remain unchanged, there will be, in the next two or three generations, a rapid change for the worse in the character of the population in all civilized countries, and an actual diminution of numbers in the most civilized.

The diminution of numbers, in all likelihood,