Those familiar with the previous writings of Dr. Gesell and his associates will undoubtedly greet this newest work with justifiable anticipation. Gesell views the human eye as virtually a vestibule of the brain and vision as pre-eminent in the sensory-motor construction of the human action system. The human eye develops just as the body develops and the development of the former plays an important role in the development of the latter. The book is another of Gesell's combinations of carefully recorded and intelligently reported observations documented with photographs of the subjects themselves.