A series of lectures presents an introduction to abnormal psychology by examining subconscious processes and their role in personality, both normal and pathological. The author uses an inductive scientific approach, assembling clinical observations and experiments to define subconscious mechanisms, distinguish facts from interpretation, and apply these ideas to psycho-neuroses and psychoses. Chapters discuss definitions, methodological cautions, case material, and theoretical formulations aimed at explaining dissociation, symptoms, and unconscious influences on behavior, arguing that many psychological phenomena can be best understood as manifestations of processes outside conscious awareness.