"Adolescence as the time when an individual 'recapitulates' the savage stage of the race's past." — G. Stanley Hall

The years from about eight to twelve constitute a unique period of human life.

The man of the future may, and even must, do things impossible in the past and acquire new motor variations not given by heredity.

Abundance and vigor of automatic movements are desirable, and even a considerable degree of restlessness is a good sign in young children.

Muscles are in a most intimate and peculiar sense the organs of the will.