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UNIV

OF

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Adaptation, increase of, 460;

in experiments, 488;
speed of, 419, 443, 501;
to milk bottle, 439;
types of, 505.

Adolescence, approach to, 522.
Affective traits, 508.
Akeley, Carl, 377.
Anger, 511.

INDEX

Anthropometry, 385, 386. Apparatus, construction of, 389. Attention and interest, 430. Attitude, change of, 427;

in experiments, 391, 429, 449, 455, 464, 474, 489;

toward experimenter, 384, 393. 523;

toward people, 523;

toward the seemingly impossible, 471, 474, 504.

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Climatic conditions 388. Clumsiness of gorilla, 470. Companionship, 516. Comparison of gorilla with other apes, 411, 434, 443, 452, 456, 458, 494, 499, 501, 503, 504, 507, 511, 525, 531.

Complication of experiments, 423. Concrete versus abstract, 404. Confusion of instruments, 425. Congo, method of handling in experiments, 389, 482; traits of, 530.

Construction of pyramids, 471, 473, 477.

Cues in delayed response experiment, 487. Curiosity, 502.

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