This book is a close reading of Jacques Lacan's seminal essay, "The Agency of the Letter in the Unconscious or Reason Since Freud, " selected for the particular light it casts on Lacan's complex relation to linguistics, psychoanalysis, and philosophy. It clarifies the way Lacan renews or transforms the psychoanalytic field, through his diversion of Saussure's theory of the sign, his radicalization of Freud's fundamental concepts, and his subversion...