In this extremely technical treatise on academic psychology, the very gifted exponent of existentialism steps boldly into a highly specialized sphere. Tracing through three centuries the various theories regarding perception and images from Descartes through and many other lesser known philosophers, he discards all classical concepts in favor of ""phenomenological psychology"". The first major contribution to this theory was made by the German philosopher, Edmund Husserl, who played an important part in Gestalt psychology and is more and more in vogue today (Farrar, Straus & will publish a discussion of Phenomenology & Science in Contemporary European Thought on the Noonday list in April.) Sartre's analysis here is introduced by Forrest Williams, a member of the Institute of Philosophy at the University of Rome, as follows; ""What really matters regarding the important subject which Sartre treats in this book is that a true psychology of imagination be built on a foundation as substantial and nourishing as that of natural science. Sartre claims that laid the cornerstone, and that further phenomenological inquiry is indispensable."" His interpretation will be valuable in university libraries, for those seriously interested in philosophy and psychology.