At a meeting of the Société de Neurologie de Paris, held the beginning of May, I was delegated to present the cordial greetings of that society to the American Neurological Association. I assure you that it affords me much pleasure to be the bearer of such greetings and to have the opportunity of expressing to you my appreciation of the hearty welcome that you have given me. I also wish to thank you for the interest that you have shown in my studies in pathologic psychology. Disorders of the psyche play an important rôle in nervous diseases and to understand such disorders often is essential. Hence I am led to present to you this study of the remarkable case of a young woman, aged 23, whom I was able to observe for several years at the Salpêtrière: a case of abnormal sleep prolonged for more than five years and of