The Will to Believe, and Other Essays in Popular Philosophy. 12mo. $2.00. New York: Longmans, Green & Co. 1897.

Is Life Worth Living? 18mo. 50 cents, net. Philadel phia: S. B. Weston, 1305 Arch Street. 1896.

Human Immortality: Two Supposed Objections to the Doctrine. 16mo. $1.00. Boston: Houghton, Mifflin & Co. 1898.

THE PRINCIPLES

OF

PSYCHOLOGY

BY

WILLIAM JAMES

PROFESSOR OF PSYCHOLOGY IN HARVARD UNIVERSITY

IN TWO VOLUMES

VOL. II

NEW YORK

HENRY HOLT AND COMPANY

1902

ROBERT DRUMMOND, ELECTROTYPER AND PRINTER, NEW YORK.

CONTENTS.

CHAPTER XVII.

PAGE

SENSATION, .

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.

. 1

CHAPTER XVIII.

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.

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

44

76

134