This latest book from the Yale Clinic of Child Development presents, in readable and persuasive style, Gesell's (by now) wellknown developmental data, which serve as the psychological and philosophical basis for a discussion of the acculturation of the child in home and school.

The developmental data reflect more than the usual refinement of observation and could have been achieved only through unremitting concentration and devoted absorption. Growth is charted from birth through five years, using as nodal ages four, sixteen, twenty-eight and forty weeks, twelve, fifteen and eighteen months, two, three, four and five years. The data are subdivided into four behavior panels: motor, adaptive, language and personalsocial. The growth formula is given as a continuous repetitive succession of innovation-integration-equilibrium. By innovation is meant the organism's 'forward thrust at its growing margin' which is usually accompanied by anxiety. During periods of innovation