I do not think that the dancing and singing of even little children can be explained wholly on the basis of unlearned and unformed responses to then existing objective conditions. Clearly there must be something in the present to evoke happiness. But the act is expressive only a there is in it a unison of something stored from past experience, something therefore generalized, with present conditions. In the case of expressions of happy children the marriage of past values and present incidents takes place easily; there are few obstructions to be overcome, few wounds to heal, few conflicts to resolve. With maturer persons, the reverse is the case. Accordingly the achievement of complete unison is rare; but when it occurs it is so on a deeper level and with a fuller content of meaning. And then, even though after long incubation and after precedent pangs of labor, the final expression may issue with the spontaneity of the cadenced speech or rhythmic movement of happy childhood.