Semper, hypothesis regarding shape-preference, 94 Sensations: distinguished from perceptions, 32; perception of relation between, 29-30 Shape: character of, 78-83; contemplation of, its intermittent but recurrent character, 106-10; determines contemplation of an aspect, 26-8; elements of, 35-47; Empathy an element of perception of, 59; facility and difficulty of grasping, 48-54; a perception, 29-34; practical causes regarding evolution of, 90-4; preference, its evolution, 94-7; and Things, their co-operation, 117-27; thinking away from, to Things, 131-2, 84-9 Sound, passive reception of, 23-4, 29 Subject of perception, extent of awareness of self, 57-9 Symmetry, 42-3 Tension, an element of form-perception, 42 Things and Shapes, their cooperation, 117-27; thoughts about, entering into shape-contemplation, 84-9 Third Dimension, locomotor nature of knowledge of, 85-6, 101 Titchener, 59 Vinci, Leonardo da, 83, 145-6 Vischer, 66 Watts, G. F., 46 Whole and Parts, perception of relation of, 48-54 Wilde's _Salome,_ 150 Wundt, 42, 66