The work of Jaques Lacan, eminent French psychoanalyst and influential thinker (1901-1981), is recognized as being of vital importance to psychoanalysts, philosophers, and all those concerned with the the study of man and language. Its value is not limited to the field of psychoanalysis alone, but provides the basis for a new philosophy of man and a new theory of discourse. It is, however, notoriously difficult for the non-specialist reader to come to terms with Lacan's reading of Freud and his investigations of the unconscious. Until now, there has been no satisfactory general introduction to Lacan, and this first general exposition of his work, translated and revised from the French edition, is designed to provide the conceptual tools which will enable the reader to study Lacan using the original texts.