Whether it was the remembrance of this rather grim spectacle as I had seen it that afternoon, or whether Harry’s story had caused some trouble in my brain, or whether it was merely that the keen bracing air of this place, to one who had just come from the sleepy languor of the Norfolk Broads, kept me sleepless, I do not know; but, anyhow, the moment I put out my light that night and got into bed, I felt that all the footlights and gas-jets in the internal theatre of my mind sprang into flame, and that I was very vividly and alertly awake. It was in vain that I counted a hundred forwards and a hundred backwards, that I pictured to myself a flock of visionary sheep coming singly through a gap in an imaginary hedge, and tried to number their monotonous and uniform countenances, that I played noughts and crosses with myself, that I marked out scores of double lawn-tennis courts,--for with each repetition of these supposedly soporific exercises I only became more intensely wakeful. It was not in remote hope of sleep that I continued to repeat these weary performances long after their inefficacy was proved to the hilt, but because I was strangely unwilling in this timeless hour of the night to think about those protruding relics of humanity; also I quite distinctly did not desire to think about that subject with regard to which I had, a few hours ago, promised Harry that I would not make it the subject of reflection. For these reasons I continued during the black hours to practise these narcotic exercises of the mind, knowing well that if I paused on the tedious treadmill my thoughts, like some released spring, would fly back to rather gruesome subjects. I kept my mind, in fact, talking loud to itself, so that it should not hear what other voices were saying. Then by degrees these absurd mental occupations became impossible; my mind simply refused to occupy itself with them any longer; and next moment I was thinking intently and eagerly, not about the bones protruding from the gnawed section of sand-cliff, but about the subject I had said I would not dwell upon. And like a flash it came upon me why Harry had bidden me not think about it. Surely in order that I should not come to the same conclusion as he had come to.