Originally published in 1975, this volume reports a multidisciplinary, longitudinal study of the precursors of intelligence, as measured by Stanford-Binet IQ scores, of 4-year-old children. Over 26, 000 children (more than 12, 000 whites and 14,000 blacks) were followed from the prenatal period, and 169 prenatal and developmental variables were examined in relation to preschool IQ scores. Considered are the degree to which events during pregnancy and delivery, physical and psychomotor development in infancy and childhood, and certain major family characteristics were related to IQ scores....