INDEX 
Abstraction, 120. See also Reasoning. 
Action-system, importance of the study 
of the, 15 f.; of monkeys, 190 f., 237. 
Anecdotal school in animal psychology, 
23 ff., rsx f. 
Apparatus, descriptions of, 29 ff., 56 ff., 
61 f., 169 £., 177 ff., 196 ff. 
Assimilation, 240 f. 
Association, as a problem in animal psy- 
chology, 20 ff.; by similarity, 116 ff.; 
complexity of, 132 ff.; conditions of, 
43 ff.; delicacy of, 128 ff., 195 ff.; de- 
velopment of, in the animal kingdom, 
285 ff.; in cats, 38 ff.; in chicks, 63 f.; 
in dogs, 56 ff.; in fishes, 169 ff.; in 
man, 123 ff., 127, 285; in monkeys, 
182 ff., 194 f., 209 ff.; in relation to 
attention, 44 ff.; to individual differ- 
ences, 52 ff.; to inhibition, 142 ff.; to 
instincts, 36 f., 142 ff.; to previous ex- 
perience, 48 ff.; number of connections 
formed by, 135 ff.; permanence of con- 
nections formed by, 138 ff., 194 f., 203 
f.; progress of, measurable by time- 
curves, 28, 40, 42; the mental fact in, 
98 ff.; without ideas, 101 f., 127, 209 ff. 
See also Associations and Learning. 
Associations, complexity, 132 ff.; deli- 
cacy, 128 ff., 195 ff.; number, 121, 
135 ff.; permanence, 138 ff., 194 f., 
203 £. 
Associative memory. See Association. 
Attention, 144 ff.; and association, 44 ff. ; 
to imposed movements, 103 ff. 
Behavior, acquired tendencies to, 244 ff. 
(see also Association); evolution of, 
272 ff.; general laws of, 241 ff.; in- 
definiteness of the term, 5; of cats, 
35 ff., 88 f., and passim; of chicks, 63 f., 
138, 143 f., 156 ff., and passim; of dogs, 
50 ff., 92 ff.; of fishes, 169 ff.; of 
monkeys, 182 ff.; original tendencies 
to, 242 f. (see also Instincts); pre- 
dictability of, 241 f.; proposed sim- 
plification of the laws of, 265 ff.; 
versus consciousness as an object of 
study, 1 ff. See also Association, 
Instincts, Learning, Memory, etc. 
BoswortH, F. D., 240. 
Cats, associative processes in, 35 ff.; 
imitation in, 85 ff.; the presence of 
ideas in, 100 ff.; reasoning in, 67 ff. 
Chicks, associative processes in, 61 ff.; 
imitation in, 81 ff.; instincts of, 156 ff. 
Complexity, of associations, 132 ff. 
Concepts, 116 ff. 
Connection-systems, action of, in asso- 
ciation, 246 ff., 266; importance of 
the study of, 16 f. 
Consciousness, amenability of, to scien- 
tific study, 7 ff.; as pure experience, 
13 f.; as studied by the one who has 
or is it, 10 ff.; of animals, 25 f., 67 ff., 
98 ff., 123, 146 f., and passim; social, 
“146 £.; space-relations of, 14; versus 
behavior as an object of study, 1 ff. 
Coérdinations, of chicks, 160 ff. 
Dean, B., 161. 
Delicacy of association, 128 ff., 195 ff. 
Dewey, J., 6. 
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 psy- 
chology 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. 
205 
