There are times when one may look upon the whole adventure of civilized life as a sort of Odyssey of domestication; and in this mood the Crystal Age marks a terminus upon that particular aspect of the adventure. To the objection that this sort of utopia requires that we change human nature, the answer, in terms of modern biology, is that there is no apparent scientific reason why certain elements in human nature should not be selected and brought to the front, or why certain others should not be reduced in importance and eliminated. So, for all practical purposes, there is no apparent reason why human nature should not be changed, or why we should not be prepared to believe that in times past it has been changed--communities which selectively bred for pugnacity and aggression committing suicide and opening the way for communities which socially selected other traits that made for survival. It is possible that in times past man has done a great deal to domesticate himself and fit himself for harmonious social life; and a utopia which rests upon the notion that there should be a certain direction in our breeding is not altogether luny; indeed, is nowadays less so than ever before, for the reason that it is possible to separate romantic love from physical procreation without, as the Athenians did, resorting to homosexuality. If A Crystal Age opens our minds to these possibilities it is not to be counted purely as a romance; in spite of the fact that as a romance it has passages that rival Green Mansions. Between the individual households and common marriages, the utopia of the beehive is a third alternative which possibly remains to be explored. 4 There are regions in the world--I am thinking perhaps of the table land of South Africa and the Mississippi Valley--where if one dreamed about utopia the apparatus to support it would be a gigantic network of steel, and huge communities of people would naturally flow together and coalesce in complicated patterns, somewhat after the fashion of those which Mr. H. G. Wells describes in When the Sleeper Awakens. It would be almost impossible, I fancy, to dream of a simple life and of handfuls of people in those parts of the earth: the simplicity would be barrenness, and a handful of people would be lost.