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Rh the street level, there was no sign of my quarry. I hoped it was nothing important that he had lost, and for the first time I examined it.

It was a plain half-sheet of notepaper with some figures and words scrawled upon it in pencil. This is a facsimile of it:

On the face of it, it certainly did not appear to be of any importance. Still, I hesitated to throw it away. As I stood there holding it, I involuntarily wrinkled my nose in displeasure. Moth balls again! I held the paper gingerly to my nose. Yes, it smelt strongly of them. But, then

I folded up the paper carefully and put it in my bag. I walked home slowly and did a good deal of thinking.

I explained to Mrs. Flemming that I had witnessed a nasty accident in the Tube and that I was rather upset and would go to my room and lie down. The kind woman insisted on my having a cup of tea. After that I was left to my own devices, and I proceeded to carry out a plan I had formed coming home. I wanted to know what it was that had produced that curious feeling of unreality whilst I was watching the doctor examine the body. First I lay down on the floor in the attitude of the corpse, then I laid a bolster down in my stead, and proceeded to duplicate, so far as I could remember, every motion and gesture of the doctor. When I had finished I had got what I wanted. I sat back on my heels and frowned at the opposite walls.

There was a brief notice in the evening papers that a man had been killed in the Tube, and a doubt was expressed whether it was suicide or accident. That seemed