This book on the genetic and environmental influences on intelligence is comprised of the following papers: "The Structure of Intelligence in Relation to the Nature-Nurture Controversy," R. B. Cattell; "Theory of Intelligence," L. G. Humphreys; "Using Measured Intelligence Intelligently," P. R. Merrifield; "Intelligence: Definition, Theory, and the IQ," D. Wechsler; "Genetic Contributions to Individual Differences in Intelligence . . . ," R. Canro; "Social Class Structure and the Genetic Basis of Intelligence," B. K. Eckland; "Race and Intelligence, What Do We Really Know?" B. E. Ginsberg and W. S. Laughlin; "Behavior-Genetic Analysis and its Biosocial Consequences," J. Hirsch; "The Race X Sex X Ability Interaction," A. R. Jensen;" . . . Properties of a Genetic Model for Human Intelligence," C. C. Li; "What Do We Know Today About the Inheritance of Intelligence and How Do We Know It?" S. G. Vandenberg; "Environment and Intelligence: A Behavioral Analysis," S. W. Bijou; "Methodological Problems and Pseudoissues in the Nature-Nurture Controversy," E. W. Gordon; "Goal as Environmental Variable in the Development of Intelligence," P. M. Greenfield; and, "Social Aspects of Intelligence: Evidence and Issues," J. M. Hunt and G. E. Kirk. (JM)