All Monday night, as I lay tossing upon a bed of pain, when fever was coursing through my veins, and every pulse went plunging like a steam engine from the gorged heart to every extremity, and my brain was like molten lead, I heard that terrible bark! It was my evil genius, my destiny. It mingled in every feverish dream, became the embodiment of every vision. I measured the periods of its recurrence by the clock that stands in the corner of our room. I counted the tickings of its silence, and I counted the tickings of its continuance. Every swing of the pendulum became a distinct period of existence.