I believe that it is wrong to designate the feeling of having experienced something before as an illusion. On the contrary, in such moments something is really touched that we have already experienced, only we cannot consciously recall the latter because it never was conscious. In short, the feeling of _Déjà vu_ corresponds to the memory of an unconscious fantasy. There are unconscious fantasies (or day dreams) just as there are similar conscious creations, which every one knows from personal experience. I realize that the object is worthy of most minute study, but I will here give the analysis of only one case of _Déjà vu_ in which the feeling was characterized by particular intensity and persistence. A woman of thirty-seven years asserted that she most distinctly remembered that at the age of twelve and a half she paid her first visit to some school friends in the country, and as she entered the garden she immediately had the feeling of having been there before. This feeling was repeated as she went through the living-rooms, so that she believed she knew beforehand how big the next room was, what views one could have on looking out of it, etc. But the belief that this feeling of recognition might have its source in a previous visit to the house and garden, perhaps a visit paid in earliest childhood, was absolutely excluded and disproved by statements from her parents. The woman who related this sought no psychologic explanation, but saw in the appearance of this feeling a prophetic reference to the importance which these friends later assumed in her emotional life. On taking into consideration, however, the circumstance under which this phenomenon presented itself to her, we found the way to another conception. When she decided upon this visit she knew that these girls had an only brother, who was seriously ill. In the course of the visit she actually saw him. She found him looking very badly, and thought to herself that he would soon die. But it happened that her own only brother had had a serious attack of diphtheria some months before, and during his illness she had lived for weeks with relatives far from her parental home. She believed that her brother was taking part in this visit to the country, imagined even that this was his first long journey since his illness; still, her memory was remarkably indistinct in regard to these points, whereas all other details, and particularly the dress which she wore that day, remained most clearly before her eyes.