First published in 1961, Sensation and Perception aims to cast light upon the nature of perception itself. This, the author believes, can be achieved only through an understanding of the concepts of sensation and perception. A survey of the principal attempts to arrive at such an understanding brings out the fact that perception has most often been assimilated to sensation or judgment. The author believes that both of these views are wrong but that an attention to the history of thought can provide an explanation of the temptation to accept them. A final chapter gives the author's own views on the nature of sensation and perception. As such it would be of interest both to philosophers and to those psychologists who are concerned with the nature of perception.