Differences, between species of animals in the associative processes, 64 ff.
Discomfort, as an influence in learning, 245 ff.
Discrimination, in cats and dogs, 128 ff.; in chicks, 156 ff.; in monkeys, 195 ff.
Dogs, associative processes in, 56 ff.; imitation in, 91 ff.; the presence of ideas in, 115 f.; reasoning in, 67 ff.
Education, applications of animal psychology in, 149 f.
Effect, the law of, 244 f., 266 ff.
Emotional reactions of chicks, 162 ff.
Evolution, of behavior, 272 ff.; of human intellect, 282 ff.; of ideas, 289 ff.
Exercise, the law of, 244 f.
Experience, the influence of previous, 48 ff.
Experiments, need of, in animal psychology, 26; with cats, 35 ff., 85 ff., 103 ff., 111 f., 114 f., 129 ff., 138 f.; with chicks, 61 ff., 81 ff., 132, 136, 143 f., 156 ff.; with dogs, 56 ff., 91 ff., 103 ff., 115 f.; with fishes, 169 ff.; with monkeys, 176-235, _passim_.
Fears, of chicks, 162 ff.
Fishes, experiments with, 169 ff.
