This Atlas is principally based on the Brush Foundation Study of Human Growth and Development, conceived in 1929 by Professor T. Wingate Todd of Western Reserve University School of Medicine. This intensive study collected data on the maturation of human anatomy through the meticulous Xraying of a series of research subjects enrolled in the study as juvenilessome as young as three monthsand thereafter routinely weighed and measured at threemonth to oneyear intervals, depending on their age.This Atlas utilizes not only the Xray films to which Todd had access but, also, those which were obtained in the six years subsequent to Todds publication of his Atlas of Skeletal Maturation of the Hand. The Xray standards in the present volume are, therefore, the first to be based exclusively on the research of the Brush Foundation Study.