ABSTRACT
The only descriptions of sub-human primate socio-sexual behaviour hitherto published have concerned small groups of animals, whose relationships were experimentally arranged by their observers. Three of these accounts are of especial interest. Hamilton,136 who was the first to report observations in this field, studied a group of twenty animals consisting of different kinds of macaque (M. rhesus = mulatta, M. irus = cynomolgus, M. sp.) and two baboons (Papio sp.). The results of his investigations were published in 1914. Köhler’s217 studies on anthropoids, carried out between 1913 and 1917 in Teneriffe, are more widely known. Though chiefly concerned with problems relating to intelligence, he also made interesting observations on the social life of a small group of chimpanzees, most of which were immature. A more important investigation of the same problems was carried out by Bingham.40 His account, published in 1928, deals with the early sexual adjustments of four immature apes.
