Correspondence, writings, and speeches relating chiefly to Weiss's role in the development of psychoanalytic theory and to his association with Sigmund Freud and Paul Federn. Subjects include agoraphobia, the death instinct, the ego, female homosexuality, and narcissism. Correspondents include Ernst Federn, Paul Federn, Sigmund Freud, Ernest Jones, Enrico Agostino Morselli, and Julius von Wagner-Jauregg.