In all these modes of developing our efferent powers, we conceive that the race comes very close to the individual youth, and that ancestral momenta animate motor neurons and muscles and preside over most of the combinations. Some of the elements speak with a still small voice raucous with age. The first spontaneous movements of infancy are hieroglyphs, to most of which we have as yet no good key. Many elements are so impacted and felted together that we can not analyze them. Many are extinct and many perhaps made but once and only hint things we can not apprehend. Later the rehearsals are fuller, and their significance more intelligible, and in boyhood and youth the correspondences are plain to all who have eyes to see. Pleasure is always exactly proportional to the directness and force of the current of heredity, and in play we feel most fully and intensely ancestral joys. The pain of toil died with our forebears; its vestiges in our play give pure delight. Its variety prompts to diversity that enlarges our life. Primitive men and animals played, and that too has left its traces in us. Some urge that work was evolved or degenerated from play; but the play field broadens with succeeding generations youth is prolonged, for play is always and everywhere the best synonym of youth. All are young at play and only in play, and the best possible characterization of old age is the absence of the soul and body of play. Only senile and overspecialized tissues of brain, heart, and muscles know it not.