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A full account is here rendered respecting sex development and behavior in certain monkeys and apes, chiefly chimpanzees. This report, which is most informative, is based not only on cross-sectional observation but also on extremely painstaking, long-section ontogenetic studies.
Of particular significance appears to be the length of time required for the establishment of sex maturity and the associated adult copulation pattern. This involves a number of years, at least, and is marked by considerable preliminary experimental trial and error, especially in relation to the determination of a final and mechanically effective coital formula. Much of the same, it is felt, represents exploratory procedure necessitated by lack of facility for expression in terms of language. In this connection, it seems that sight and touch are the sense mediums most involved. During the formative period, the author finds that sex response organization involves the following phases: sucking, clinging, nuzzling, genital contact,