Presently I heard a slight groan, and I knew it was the groan of mortal terror. It was not a groan of pain or of grief--oh, no!--it was the low, stifled sound that arises from the bottom of the soul when overcharged with awe. I knew the sound well. I knew that he had been lying awake ever since the first slight noise, when he had turned in the bed. His fears had been ever since growing upon him. He had been trying to fancy them causeless, but could not. When I had waited a long time, very patiently, without hearing him lie down, I resolved to open a little--a very, very little crevice in the lantern. So I opened it--you cannot imagine how stealthily, stealthily--until at length a single dim ray, like the thread of the spider, shot from out the crevice and fell upon the vulture eye. It was open--wide, wide open--and I grew furious as I gazed upon it. I saw it with perfect distinctness--all a dull blue, with a hideous veil over it that chilled the very marrow in my bones; but I could see nothing else of the old man's face or person; for I had directed the ray as if by instinct, precisely upon the spot. Now, there came to my ears a low, dull, quick sound, such as a watch makes when enveloped in cotton. I knew that sound well, too. It was the beating of the old man's heart. It increased my fury, as the beating of a drum stimulates the soldier into courage. But even yet I refrained and kept still. I scarcely breathed; I held the lantern motionless. I tried how steadily I could maintain the ray upon the eye. Meantime the hellish tattoo of the heart increased. It grew quicker and quicker, and louder and louder every instant. The old man's terror must have been extreme! It grew louder, I say, louder every moment! do you mark me well? I have told you that I am nervous; so I am. And now at the dead hour of the night, amid the dreadful silence of that old house, so strange a noise as this excited me to uncontrollable terror. Yet for some minutes longer I refrained and stood still. But the beating grew louder, louder! I thought the heart must burst. And now a new anxiety seized me--the sound could be heard by a neighbor! The old man's hour had come! With a loud yell I threw open the lantern and leaped into the room. He shrieked once--once only. In an instant I dragged him to the floor, and pulled the heavy bed over him. I then smiled gayly to find the deed so far done. But for many minutes the heart beat on with a muffled sound. This, however, did not vex me; it would not be heard through the wall. At length it ceased. The old man was dead. I removed the bed and examined the corpse. I placed my hand upon the heart and held it there many minutes. There was no pulsation. He was stone dead. His eye would trouble me no more. If you still think me mad, you will think so no longer when I describe the wise precautions I took for the concealment of the body. The night waned, and I worked hastily, but in silence. First of all I dismembered the corpse.