conception of "progress" is a useful conception in so far as it binds together those who are working for common ends, and stimulates that perpetual slight movement in which life consists. But there is no general progress in Nature, nor any unqualified progress; that is to say, that there is no progress for all groups along the line, and that even those groups which progress pay the price of their progress. It was so even when our anthropoid ancestors rose to the erect position; that was "progress," and it gained us the use of hands. But it lost us our tails, and much else that is more regrettable than we are always able to realize. There is no general and ever-increasing evolution towards perfection. "Existence is realized in its perfection under whatever aspect it is manifested," says Jules de Gaultier. Or, as Whitman put it, "There will never be any more perfection than there is now." We cannot expect an increased power of growth and realization in existence, as a whole, leading to any general perfection; we can only expect to see the triumph of individuals, or of groups of individuals, carrying out their own conceptions along special lines, every perfection so attained involving, on its reverse side, the acquirement of an imperfection. It is in this sense, and in this sense only, that progress is possible. We need not fear that we shall ever achieve the stagnant immobility of a general perfection.
The problems of progress we are here concerned with are such as the civilized world, as represented by some of its foremost individuals or groups of individuals, is just now waking up to grapple with. No doubt other problems might be added, and the addition give a greater semblance of completion to this book. I have selected those which seem to me very essential, very fundamental. The questions of social hygiene, as here understood, go to the heart of life. It is the task of this hygiene not only to make sewers, but to re-make love, and to do both in the same large spirit of human fellowship, to ensure finer individual development