How long I slept I never knew. I awoke at once with that abrupt start which we all know well, and which carries us in a second from utter unconsciousness to the full use of our faculties. The fire was still burning, but was very low, and half the room or more was in deep shadow. I knew, I felt, that some person or thing was in the room, although nothing unusual was to be seen by the feeble light. Yet it was a sense of danger that had aroused me from slumber. I experienced, while yet asleep, the chill and shock of sudden alarm, and I knew, even in the act of throwing off sleep like a mantle, WHY I awoke, and that some intruder was present. Yet, though I listened intently, no sound was audible, except the faint murmur of the fire—the dropping of a cinder from the bars— the loud, irregular beatings of my own heart. Notwithstanding this silence, by some intuition I knew that I had not been deceived by a dream, and felt certain that I was not alone. I waited. My heart beat on; quicker, more sudden grew its pulsations, as a bird in a cage might flutter in presence of the hawk. And then I heard a sound, faint, but quite distinct, the clank of iron, the rattling of a chain! I ventured to lift my head from the pillow. Dim and uncertain as the light was, I saw the curtains of my bed shake, and caught a glimpse of something beyond, a darker spot in the darkness. This confirmation of my fears did not surprise me so much as it shocked me. I strove to cry aloud, but could not utter a word. The chain rattled again, and this time the noise was louder and clearer. But though I strained my eyes, they could not penetrate the obscurity that shrouded the other end of the chamber whence came the sullen clanking. In a moment several distinct trains of thought, like many-colored strands of thread twining into one, became palpable to my mental vision. Was it a robber? Could it be a supernatural visitant? Or was I the victim of a cruel trick, such as I had heard of, and which some thoughtless persons love to practice on the timid, reckless of its dangerous results? And then a new idea, with some ray of comfort in it, suggested itself. There was a fine young dog of the Newfoundland breed, a favorite of my father’s, which was usually chained by night in an outhouse. Neptune might have broken loose, found his way to my room, and, finding the door imperfectly closed, have pushed it open and entered. I breathed more freely as this harmless interpretation of the noise forced itself upon me. It was—it must be—the dog, and I was distressing myself uselessly. I resolved to call to him; I strove to utter his name—“Neptune, Neptune,” but a secret apprehension restrained me, and I was mute.