1. The function of perception: Need of knowing the material world--The problem which confronts the child. 2. The nature of perception: How a percept is formed--The percept involves all relations of the object--The content of the percept--The accuracy of percepts depends on experience--Not definitions, but first-hand contact. 3. The perception of space: The perceiving of distance--The perceiving of direction. 4. The perception of time: Nature of the time sense--No perception of empty time. 5. The training of perception: Perception needs to be trained--School training in perception. 6. Problems in observation and introspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 CHAPTER VIII MENTAL IMAGES AND IDEAS 1. The part played by past experience: Present thinking depends on past experience--The present interpreted by the past--The future also depends on the past--Rank determined by ability to utilize past experience. 2. How past experience is conserved: Past experience conserved in both mental and physical terms--The image and the idea--All our past experience potentially at our command. 3. Individual differences in imagery: Images to be viewed by introspection--The varied imagery suggested by one's dining table--Power of imagery varies in different people--Imagery types. 4. The function of images: Images supply material for imagination and memory--Imagery in the thought processes--The use of imagery in literature--Points where images are of greatest service. 5. The cultivation of imagery: Images depend on sensory stimuli--The influence of frequent recall--The reconstruction of our images. 6. Problems in introspection and observation . . . . . . . . . . . . . . 111 CHAPTER IX IMAGINATION 1. The place of imagination in mental economy: Practical nature of imagination--Imagination in the interpretation of history, literature, and art--Imagination and science--Everyday uses of imagination--The building of ideals and plans--Imagination and conduct--Imagination and thinking. 2. The material used by imagination: Images the stuff of imagination--The two factors in imagination--Imagination limited by stock of images--Limited also by our constructive ability--The need of a purpose. 3. Types of imagination: Reproductive imagination--Creative imagination. 4. Training the imagination: Gathering of material for imagination--We must not fail to build--We should carry our ideals into action. 5. Problems for observation and introspection . . . . . . . . 127 CHAPTER X ASSOCIATION