“Whatever the tests of admission, the social set when formed is not a mere economic class, but something which more nearly resembles a biological clan. Membership is intimately connected with love, marriage and children, or, to speak more exactly, with the attitudes and desires that are involved. In the social set, therefore, opinions encounter the canons of Family Tradition, Respectability, Propriety, Dignity, Taste and Form, which make up the social set's picture of itself, a picture assiduously implanted in the children.”