Play, both in animals and men, as Groos has shown with marvelous wealth of illustration, is a beneficent process of education; the young creature is thereby preparing itself for the exercise of those functions which in later life it must carry out more completely and more seriously.

In his _Spiele der Menschen_, Groos applies this idea to the sexual play of children, and brings forward quotations from literature in evidence.

Keller, in his "Romeo und Juliet auf dem Dorfe," has given an admirably truthful picture of these childish love-relationships.

Emil Schultze-Malkowsky (_Geschlecht und Gesellschaft_, Bd.

ii, p.