THE DYSGENIC CLASSES
Before examining the methods by which society can put into effect some measure of negative or restrictive eugenics, it may be well to decide what classes of the population can properly fall within the scope of such treatment. Strictly speaking, the problem is of course one of individuals rather than classes, but for the sake of convenience it will be treated as one of classes, it being understood that no individual should be put under restriction with eugenic intent merely because he may be supposed to belong to a given class; but that each case must be investigated on its own merits,—and investigated with much more care than has hitherto usually been thought necessary by many of those who have advocated restrictive eugenic measures.
The first class demanding attention is that of those feeble-minded whose condition is due to heredity. There is reason to believe that at least two-thirds of the feeble-minded in the United States owe their condition directly to heredity,1 and will transmit it to a large per cent of their descendants, if they have any. Feeble-minded persons from sound stock, whose arrested development is due to scarlet fever or some similar disease of childhood, or to accident, are of course not of direct concern to eugenists.
The number of patent feeble-minded in the United States is probably not less than 300,000, while the number of latent individuals—those carrying the taint in their germ-plasm and capable of transmitting it to their descendants, although the individuals themselves may show good mental development—is necessarily much greater. The defect is highly hereditary in nature: when two innately feeble-minded persons marry, all