THE PRINCIPLES

OF

PSYCHOLOGY

BY

WILLIAM JAMES

PROFESSOR OF PSYCHOLOGY IN HARVARD UNIVERSITY

IN TWO VOLUMES

VOL. II

NEW YORK

HENRY HOLT AND COMPANY

1908

Copyright, 1890

BY

HENRY HOLT & CO.

L

SOIHUL OROMATRONA DU
VIRAVIHU

ROBERT DRUMMOND COMPANY, PRINTERS, NEW YORK

122303

Its distinction from perception, 1. Its cognitive function-
acquaintance with qualities, 3. No pure sensations after the first
days of life, 7. The 'relativity of knowledge,' 9. The law of
contrast, 13. The psychological and the physiological theories
of it, 17. Hering's experiments, 20. The eccentric projection'
of sensations, 31.

CHAPTER XVIII.

- PAGE

. 1

IMAGINATION,

Our images are usually vague, 45. Vague images not neces-
sarily general notions, 48. Individuals differ in imagination;
Galton's researches, 50 The visile' type, 58. The 'audile'
type, 60. The 'motile' type, 61. Tactile images. 65. The neural
process of imagination, 68. Its relations to that of sensation, 72.

CHAPTER XIX.

THE PERCEPTION OF THINGS,' .

Perception and sensation, 76. Perception is of definite and
probable things, 82. Illusions, 85;-of the first type, 86;-of
the second type, 95. The neural process in perception, 103.
'Apperception,' 107. Is perception an unconscious inference?
111. Hallucinations, 114. The neural process in hallucination,
122. Binet's theory, 129. Perception-time,' 131.

44

76

CHAPTER XX.

THE PERCEPTION OF SPACE,

The feeling of crude extensity, 134. The perception of spatial
order, 145. Space-' relations,' 148. The meaning of localization,
153. 'Local signs,' 155. The construction of 'real' space, 166.
The subdivision of the original sense-spaces, 167. The sensation

134