THE THOMAS WILLIAM SALMON MEMORIAL LECTURES, Sixth Series, were delivered by Dr. David Kennedy Henderson, Physician Superintendent of the Royal Edinburgh Hospital for Mental Disorders, on April 18th, 19th and 20th, at the New York Academy of Medicine. The subject: Psychopathic States Considered from the View of 1. Their Place in Psychiatry; 2. Their Characteristics as Evidenced by Aggression, Inadequacy, and Creativeness; 3. Their Understanding and Synthesis. Dr. Henderson is Professor of Psychiatry at the University of Edinburgh.