of emotion, [222] ff., [268];

of sentiment, [291];

intention of, in music, [135].

Extension, sensory, [66], [124];

as basis of spatial perception, [124].

Eye, sensations from, [56] ff.;

a photographic camera, [58];

structure of daylight, [59];

of twilight, [60];

central blindness of twilight, [60];