“…The appearance of narcoleptic phenomena after commotio cerebralis is mentioned by Souques, and has been made the subject of a careful study by Lhermitte.46 The symptoms in the personal case of Lachschlag already mentioned followed an injury to the frontal region. Alcoholism in patient or parentage was a feature in those of Noack, Redlich, 88 Stiefler,85 and Hilpert. The possibility of an endocrine etiology is suggested mainly by the interesting fact that 106 MODERN PROBLEMS IN NEUROLOGY in a considerable number of instances narcolepsy has been 'associated with a definite increase in weight, the result of the patient's becoming more fat (Hirsch, Ballet, Münzer, Caton, Jolly, Stiefler,ß5 Lamacq, Redlich, 69 Hilpert, Janzen, Curschmann and Prange, and my Case 2).…”