1860. Contents Part I: General Development of Somnambulism, External Causes of Somnambulism, External Influences Which Disturb Somnambulic Sleep, Cramp, Somnambulism and Cramp in Conjunction, The Mutual Relations of Somnambulism and Cramp, The Condition of the Senses, The Muscles in Cramp, and The Nerves in Somnambulism. Contents Part II: The Influence of Sensuous Impressions, Influences of Mental Activity, Influences of the Feelings, Affections and Desires, Mental Exaltation in Somnambulism, Some Peculiar Mental Conditions of Somnambulists, State of the Memory in Somnambulism, and The Nature of Somnambulism.