. Biology; the story of living things. 386 THE MAINTENANCE OF THE INDIVIDUAL Intelligence of Apes Because of their relationship to man, the higher apes have been the source of much fruitful experimentation of late years. Kohler ^ has demonstrated that the chimpanzee shows evidence of emotionalized response as well as a comparatively high degree of intelligence. A chimpanzee shows emotion not only by actions, but also in facial. Yale LaboTotOTies of Primate Biology Chimpanzees are the most emotional as well as intelligent of the apes. expression. The ape jumps up and down to show excitement, kn
. Biology; the story of living things. 386 THE MAINTENANCE OF THE INDIVIDUAL Intelligence of Apes Because of their relationship to man, the higher apes have been the source of much fruitful experimentation of late years. Kohler ^ has demonstrated that the chimpanzee shows evidence of emotionalized response as well as a comparatively high degree of intelligence. A chimpanzee shows emotion not only by actions, but also in facial. Yale LaboTotOTies of Primate Biology Chimpanzees are the most emotional as well as intelligent of the apes. expression. The ape jumps up and down to show excitement, knocks its head on the floor of the cage when unable to solve a difficult problem, or looks vacuously into space and smiles when lost in con- templation of some object that interests it. Yerkes ^ shows that chimpanzees have wide differences in emotional or intelligent conduct. One may be gloomy, another happy, one lethargic, another active, one dull mentally, and another bright. They may be as tempera- mental as some human beings or just as stoical. They also show great differences in mentality and like man have their "off" days. Kohler describes one series of experiments which show that apes have intelligence to solve problems difficult enough to test the inge- nuity of a young human child. The ape Koko was the subject. In his cage was placed a box and from the top of the cage a banana was suspended well out of reach. The ape first tried jumping for the 1 Kohler, W., The Mentality of Apes, Kegan, London, 1924. 2 Yerkes, R. M., and Learned, B. W.: Chimpanzee Intelligence and Its Vocal Expression. liams and Wilkins Co. Wil-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George W. (George William), 1873-1948; Walter, Herbert Eugene, b. 1867; Hunter, George W. (George William), 1902-. New York
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