If we embrace in the intermediate class those who maintain themselves in tolerable comfort, but only by steady work and close economy, never being able to accumulate much surplus, it is by far the largest class of the three, and one in which the conditions of survival seem favorable to the increase of good types. The excess of births over deaths is greater than among the upper class, on the one hand, or among the misery class on the other. The measure of success attained requires solid qualities, such as intelligence and tenacity, in as great measure, often, as a more brilliant career; and as there is no inherited “independence,” these must be kept in constant operation. Helpmates and “good providers” are appreciated in marriage, though sexual intuitions also play a large part. Domestic sentiment is strong and seldom overshadowed by extravagant ambition. It seems that the selection of types and the maintenance of a sound eugenic standard—so far as it is maintained—is chiefly accomplished here. Writers on eugenics have given most of their attention to extremes, as Galton in his work on Hereditary Genius, and Dugdale and later writers in monographs on degenerate families; but while conditions in these extremes are important they probably count less than those in the far more numerous intermediate class. Galton’s argument that the paramount eugenic object is to increase the fecundity of the highly successful types rests entirely upon his premise that these types have an all-around superiority proportionate to their success. If we reject this and deny that it is possible to locate the source of future supermen in a small class, then the “plain people” deserve our chief attention. The type of man that can and will raise a family under medium conditions is the type that must prevail in numbers, and there is little reason to doubt that this is, on the whole, a good type, or rather a variety of good types. The mass of men we wish to be, first of all, well-proportioned in mind and body, with health, sound nerves, intelligence, perseverance, adaptability, and strong social impulses. All these are qualities favorable to normal success and fecundity.