I could see nothing of my friend but his head, and he had evidently gone to sleep while waiting for me, so I went up to him to rouse him. I saw him quite clearly; his right arm was hanging down and his legs were crossed, while his head, which was somewhat inclined to the left of the armchair, seemed to indicate that he was asleep. "Who can it be?" I asked myself. I could not see clearly, as the room was rather dark, so I put out my hand to touch him on the shoulder, and it came in contact with the back of the chair. There was nobody there; the seat was empty. I fairly jumped with fright. For a moment I drew back as if some terrible danger had suddenly appeared in my way; then I turned round again, impelled by some imperious desire of looking at the armchair again, and I remained standing upright, panting with fear, so upset that I could not collect my thoughts, and ready to drop. But I am a cool man, and soon recovered myself. I thought: "It is a mere hallucination, that is all," and I immediately began to reflect about this phenomenon. Thoughts fly very quickly at such moments. I had been suffering from a hallucination, that was an incontestable fact. My mind had been perfectly lucid and had acted regularly and logically, so there was nothing the matter with the brain. It was only my eyes that had been deceived; they had had a vision, one of those visions which lead simple folk to believe in miracles. It was a nervous accident to the optical apparatus, nothing more; the eyes were rather congested, perhaps. I lit my candle, and when I stooped down to the fire in so doing, I noticed that I was trembling, and I raised myself up with a jump, as if somebody had touched me from behind. I was certainly not by any means quiet. I walked up and down a little, and hummed a tune or two. Then I double-locked my door, and felt rather reassured; now, at any rate, nobody could come in. I sat down again, and thought over my adventure for a long time; then I went to bed, and blew out my light. For some minutes all went well; I lay quietly on my back, but then an irresistible desire seized me to look round the room, and I turned on to my side. My fire was nearly out, and the few glowing embers threw a faint light on to the floor by the chair, where I fancied I saw the man sitting again. I quickly struck a match, but I had been mistaken, for there was nothing there; I got up, however, and hid the chair behind my bed, and tried to get to sleep as the room was now dark, but I had not forgotten myself for more than five minutes when in my dream I saw all the scene which I had witnessed as clearly as if it were reality. I woke up with a start, and having lit the candle, I sat up in bed, without venturing even to try and go to sleep again.