It is seldom observed that somnambulism is attended with dangerous tendencies, yet they are sometimes present. One of my patients once took by mistake ninety grains of chloral at a single dose. While under its effects she got out of bed, walked into her sister’s room, shook her fist in her face, and swore furiously at her. On awaking, next morning, she was greatly shocked by the account of this dreadful behavior, so utterly at variance with her usual temper and character. Another somnambulic patient one night rushed into her mother’s room, violently accusing her of stealing her pocket-book, and threatening vengeance if it were not returned. Such patients sometimes mislay the articles with which they occupy themselves during a paroxysm, and on waking they erroneously infer that they have been robbed. Sometimes, as in the celebrated case related by Mesnet, the natural propensities of the individual seem to be released from all restraint, and brutal instincts guide the actions of the somnambulist, who then steals, or eats and drinks with the voracity of a savage. Ball and Chambard (_loc. cit._) have collected a number of examples in which impulses to suicide or other forms of violence were manifested under such circumstances. Obviously, where the moral sense is asleep, and where the affection is the result of causes beyond the control of the patient, he cannot be held morally responsible for the consequences of such actions. His condition closely resembles that of the victim of epileptic mania who delivers himself during a paroxysm to all degrees of furious and homicidal violence, without retaining the slightest recollection of the fact after its conclusion. The closeness of the parallel between these two disorders is rendered further apparent by the circumstance that although all memory of the events of epileptic mania is usually abolished, it does sometimes persist after the termination of the attack. Thus, one of my epileptic patients for a time manifested symptoms of insanity after every fit. During one of these paroxysms he imagined that the sparrows on the housetop were all singing a particular tune which had attracted his attention shortly before the convulsion. Then it seemed to him that the breathing of his sleeping child whispered the same tune. Placing his hand upon the bosom of his wife, her breathing assumed the same musical character. Calling upon his family to listen to the wonderful music, they all asserted that they too could hear it. It was a considerable time after his recovery before he could be convinced that this vividly remembered experience was a pure illusion. The members of his family had been cautioned against contradicting their father during his paroxysms; consequently, when he asked if they could hear the melody which delighted him, they answered affirmatively, and thus confirmed him in his delusion. To the ordinary form of epileptic mania such paroxysms