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Fig. 3. — Köhler’s Sultan making a long stick of two pieces of bamboo to get a banana.
From Köhler’s The Mentality of Apes. (By permission of Harcourt, Brace & Company.)
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Fig. 4.—Chang resents an injury to a companion.
Fig. 3. — Köhler’s Sultan making a long stick of two pieces of bamboo to get a banana.
From Köhler’s The Mentality of Apes. (By permission of Harcourt, Brace & Company.)
Fig. 4.—Chang resents an injury to a companion.
