These two books are magnificently prepared with red leather bindings and are in loose-leaf form, so that the material can be taken out and arranged in whatever manner one wishes to meet the peculiar demands of the situation. The introduction to the book gives a good description of its contents:
"This Atlas delineates the early growth of human behavior. The word atlas is used advisedly for we have attempted to chart in a systematic manner the major areas of the infant's behavior world. In these two volumes, embracing over three thousand photographs will be found visible manifestations of his maturing patterns of action and reaction: his bodily postures—supine, prone and ultimately upright; his space defying projections of posture—rolling, pivoting, squatting, crawling, creeping, cruising, climbing, walking; his sensori-motor incorporation of the physical environment through eyes, hands and mouth, staring, scanning, approaching, contacting, grasping, manipulating; his adaptive appropriation of this environment through