The student of human progress is likely to be increasingly impressed with the interaction between ideas and institutions. How far does man build and shape institutions to give body to his ideas? How far is it the organized life with its social contacts, its give and take, its enlargement of its membership to see life _sub specie communitatis_, which itself brings ideas to birth? Desire may bring the sexes together, but it is the association and organized relationships of the family which transform casual to permanent affection and shape our conceptions of its values. A herding instinct or a common need of defense or of food supplies may bring together early groups, and will to power may begin the state, but it is the living together which generates laws and wakens the craving for liberty and the struggle for justice. Seer and poet doubtless contribute to progress by their kindling appeals to the imagination and sympathy; the philosopher may, as Plato claimed for him, live as citizen of a perfect state which has no earthly being, and shape his life according to its laws; but mankind in general has learned law and right, as well as the arts of use and beauty, in the school of life in common. So it is likely to be with international coöperation. Fears and hopes now urge it upon a reluctant, incredulous world. But the beginnings--scientific, legal, commercial, political--timid and imperfect though they be, like our own early confederation, will work to reshape those who take part. Mutual understanding will increase with common action. When men work consistently to create new resources instead of treating their world as a fixed system, when they see it as a fountain, not as a cistern, they will gradually gain a new spirit. The Great Community must create as well as prove the ethics of coöperation. _The Riverside Press_ CAMBRIDGE · MASSACHUSETTS U · S · A