The idolum of eutopia which we may seek to project in this or that region is not a _carte blanche_ which any one may fill in at his will and caprice; certain lines have already been fixed; certain spaces have already been filled. There is a consensus among all utopian writers, to begin with, that the land and natural resources belong undividedly to the community; and even when it is worked by separate people or associations, as in Utopia and Freeland the increment of the land--the economic rent--belongs to the community as a whole. There is also a pretty common notion among the Utopians that, as land is a common possession, so is work a common function; and no one is let off from some sort of labor of body or mind because of any inherited privileges or dignities that he can point to. Finally, there is the almost equally common notion, among the utopians, that the perpetuation of the species leaves plenty of room for improvement, and that, as far as human knowledge and foresight are worth anything, it should be applied to propagation; so that the most reckless and ill-bred shall not burden the community with the support of their offspring while those of finer capacity are neglected or overwhelmed in numbers. Besides these general conditions for the good life which the utopians unite to emphasize, there are certain other points in the utopian tradition of which one writer or another has given the classic statement. With Plato we see the enormous importance of birth and education; we recognize the part good breeding, in every sense of the word, must play in the good community. Sir Thomas More makes us aware of the fact that a community becomes a community to the extent that it has shared possessions, and he suggests that the local group might develop such a common life as the old colleges of Oxford have enjoyed. When we turn to Christianopolis, we are reminded that the daily life and work of the community must be infused with the spirit of science, and that an acute practical intelligence such as we find today among the engineers need not be divorced from the practice of the humanities. Even the nineteenth century utopias have a contribution to make. They remind us by their overemphasis that all the proud and mighty idealisms in the world are so many shadows unless they are supported by the whole economic fabric--so that “eutopia” is not merely a matter of spiritual conversion, as the ancient religions taught, but of economic and geotechnic reconstruction. Finally, from James Buckingham and Ebenezer Howard we can learn the importance of converting the idolum of eutopia into plans and layouts and detailed projections, such as a townplanner might utilize; and we may suspect that a eutopia which cannot be converted into such specific plans will continue, as the saying is, to remain up in the air.