Case 1. “I had been to the hospital, to see my friend B., who was suffering from a cancer in the face.... When he spoke it was necessary to come quite close in order to hear what he said, and thus, in spite of the antiseptic dressings, an acrid, fetid odour forced itself on one’s nostrils.... I was to go again to see him—I had promised to do so; but this prospect was intensely repugnant to me. While walking in a part of Paris, where neither space nor fresh air was wanting, I reproached myself silently for not having gone to see the poor patient.... At this very moment I perceived, as though I had been close to him, the same acrid odour, recognisable as that of a cancerous tumour—so suddenly that I instinctively held my sleeve to my nose in order to see whether I had not brought away the smell in my clothes. This, however, was immediately succeeded by the reflection that I had not been to the hospital for five days, and that, moreover, I was not wearing the same overcoat as on the occasion of my visit.” Case 2. "I can only recall two odours: one inextricably connected with the memory of a sick-room—a stale smell of drugs and vitiated air, truly disagreeable when it recurs, as at the present moment.... “It has happened to me to discover a very peculiar and indefinable odour in the presence of a hypnotiser (M. R——) when he was putting me to sleep, and I had not quite reached the lethargic state. I have since noticed that very often (not always) the memory of this curious odour accompanies the recollection of the hypnotiser. This seems to me all the more convincing, because, the odour being very subtle when M. R—— is near me, the revival must be absolute to allow of the return of the sensation, in however slight a degree.” I should hesitate to admit the spontaneous or voluntary revival of almost all odours, if this fact had not been affirmed to me, in perfect good faith, by educated and competent witnesses. I give some extracts from these declarations: “I can perceive nearly all characteristic odours, and can call them up at will; at this moment I am thinking of the country of the Rhine, and am fully conscious of its odour.” “I can recall the greater number of odours (but not all) either spontaneously or voluntarily. (In the latter case time is required.)—Can you perceive, _here_ and _now_, the scent of roses, and, if so, of what kind?—I perceive it _in genere_; but, on further persevering, I find it to be the scent of withered roses. The visual representation occurs afterwards.” The only person who has told me that he finds all odours perceptible at will always finds a preliminary visual representation necessary.[99] ----- Footnote 99: