Determinants of Infant Behavior: Edited by B. M. Foss. New York: John Wiley & Sons, Inc., 1961. 308 pp.

Ten papers presented in 1959 at a Tavistock Study Group on Mother-Infant Interaction reflect some recent thinking about infant maturation by advanced workers in psychology, pediatrics, psychiatry, and zoölogy, with some contributions from obstetrics and psychoanalysis.

Part I, Neonate Behavior, offers a study by Blauvelt and McKenna on the regular neonatal response of head orientation to tactile stimulation of mouth and ear. Gunther reports his finding of one hundred percent correlation (in how many mothers?) between the shape of nipple and effectiveness of breast feeding; Prechtl deals with neuropathological damage following complications of birth, imputing the damage to foetal position during the last part of pregnancy rather than to specific or central lesions.

Part II, Animal Experiments, contains a paper by Rosenblatt, Turkewitz, and Schneirla describing a sophisticated and significant investigation of the effects of early separation upon the socialization of the domestic kitten and upon the response of the adult female. Harlow reports important experiments with rhesus monkeys, delineating