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The symposium, for which this paper is an introduction, is concerned with deter­mining whether or not adolescent slowing of postnatal growth and a subsequent spurt are to be found among the non-human primates. The papers establish that these phenomena are not restricted to mankind and are thus at least a cercopithecoid characteristic. The differences among these primates are of magnitude rather than of presence or absence. There is some speculation as to the possible selective advantage given to adolescence so as to modify ontogeny and produce contemporary phylogenetic differences.