ETHICS art, social reform. Where productive energy persists for some time, a factor which Dr. Unwin calls * human entropy* comes into play. Human entropy is the inherent tendency, manifested as soon as the suitable social conditions are created, towards increased refinement and accuracy. *No society can display productive social energy unless a new generation inherits a social system under which sexual opportunity is reduced to a minimum. If such a system be preserved a richer and yet richer tradition will be created, refined by human entropy/ As a matter of brute historical fact, no civilized society has tolerated for very long the limitation to a minimum of its sexual opportunities. Within a few generations, the rules imposing absolute pre-nuptiaj continence upon females and absolutely monogamous forms of marriage are relaxed. When this happens, the society or the class loses its energy and is replaced by another society, or another class, whose members have made themselves energetic by practising sexual continence. ' Sometimes/ writes Dr. Unwin, ca man has been heard to declare that he wishes both to enjoy the advantages of high culture and to abolish compulsory continence. The inherent nature of the human organism, however, seems to be such that these desires are incompatible, even contradictory. . . . Any human society is free to choose, either to display great energy or to enjoy sexual freedom; the evidence is that it cannot do both for more than one generation.* We have seen that, as a matter of historical fact, no society has consented to retain the tradition of pre-nuptial continence and absolute monogamy for very long. But it is also a matter of historical fact that these traditions have always hitherto been associated with the oppression of women and children. In deistic societies, wives have been regarded as slaves or mere chattels, having no legal entity. Custom and law have placed them at the mercy of their 313