"The top light is arranged to open in sections, the top as well as the four sides. The side glasses were my idea for bad weather, so that I could always have ventilation on one side or the other without rain driving in, as it will with an ordinary skylight. I had the middle section raised, and one side open as well. Presently I was conscious that something was trying to enter at the glass. There were no sound on the roof itself, which is galvanized, but I could hear plainly a sort of scraping at the window. The inside light was so strong that I could see nothing, but something was gradually obscuring the opening. I had a conviction that the thing, whatever it was, was attracted by my light, and I made an effort, with the strange drowsiness gaining on me, to reach the lamp and turn it out. "I was on my feet, reaching across the table, with the glare of the lamp full in my eyes, when something--I don't know what--struck me and threw me to the ground. My hand was already on the lamp, and I must have managed to turn it out actually in the moment of falling. I have a recollection of struggling for a moment there in the darkness, of trying, with some sort of hazy instinct, to drag myself under cover of the table, and then I suppose I became unconscious. "When I came to it was broad daylight. I was lying on the floor, near the table. There was broken glass near me, and I seemed to remember the crash of it before I lost consciousness. My clothes were torn, my arms and chest were badly scratched--I must have somehow defended my face without knowing it--and I was stiff all over when I moved. When I got into the open I was seized with an intense nausea, which lasted for several minutes. My wife and sister are used to my being up till all hours, so that my absence had caused no uneasiness. I went into the house, washed myself as well as I could, and went to sleep. It was then five o'clock, so that I must have been nearly four hours unconscious." "Did you notice any other symptoms besides the nausea?" I interrupted. "Yes; an intense fatigue. It was not sleepiness. I was tired out, as if I had been through some great exertion." "Well?" I said, for I knew he had not finished.