In this book Sigmund Freud has attempted to expound the methods and results of dream-interpretation; and in so doing he does not think he overstepped the boundary of neuro-pathological science. For the dream proves on psychological investigation to be the first of a series of abnormal psychic formations, a series whose succeeding members-the hysterical phobias, the obsessions, the delusions- must, for practical reasons, claim the attention of the physician.