CONTENTS.

I'AGE

Lecture First...........i-ii

Philosophical Anticipations of Psychology, 1-5. Spiritualism
and Materialism, 5-7. Methods and Aids of Psychological
Investigation, 7-11.

Lecture Second..........12-32

Analysis of Mental Processes, 12-15. Idea and Sensation, 15-17.
Intensity and Quality of Sensation, 17, 18. Measurement of
the Intensity of Sensation, 18-32,

Lecture Third...........33-49

Estimation of the Intensity of Sensation, 33-39. Mathematical
Expression of the Law of Sensation-intensities, 39-42. Signi¬
ficance of Negative Sensation-values, 42-47. Unit of Stimulus
and Unit of Sensation, 47-49.

Lecture Fourth..........50-63

, A Just Noticeable Sensation, 50-56, Upper and Lower Limit of
Weber's Law, 56-59, Psychological Interpretation of the
Law, 59-63.

Lecture Fifth...........64-86

Quality of Sensation, 64-66. Tone-sensations ; Beats, 67-73.
Clang-colour, 73-75. Simultaneous Clangs, 75-77. Noises,
77, 78. Measurement of Differences of Tone-sensations, 78-81.
The Tonal Scale, 81-84.    Relation to Weber's Law, 84-86.

Lecture Sixth..........87-107

Light-sensations ; Sensations of Colour and Brightness, 87, 88.
Analysis and Mixture of Colours, 88-95. The Three Funda¬
mental Colours, 96-98. Leonardo's Four Principal Colours,
99-103.    Theory of Light-sensations, 103-107.

Lecture Seventh.........108-119

Relation of the Senses of Sight and Hearing, 108, Positive and
Negative After-images, 108-110. Mechanical and Chemical
Senses, no, in. Phenomena of Contrast, 111-118, General
Law of Relativity, 118, 119.

Lecture Eighth        . '........120-133

Reflex   Movements,   120-126.     Purposiveness   of   the   Reflex,
126-128.    Development of the Reflexes of Touch and Sight,
/     128-133,

Lecture Ninth.........134-148

Muscle-sensations : their Influence upon Localisation, 134-138.
Connexion of Sensations of Movement with other Sensations,
138-142.     Influence   of   Practice   upon   Reflex  Movements,