nail could not have been replaced. The conclusion was plain, and again narrowed in the field of my investigations. The assassins must have escaped through the other window. Supposing, then, the springs upon each sash to be the same, as was probable, there must be found a difference between the nails, or at least between the modes of their fixture. Getting upon the sacking of the bedstead, I looked over the head-board minutely at the second casement. Passing my hand down behind the board, I readily discovered and pressed the spring, which was, as I had supposed, identical in character with its neighbor. I now looked at the nail. It was as stout as the other, and apparently fitted in the same manner, driven in nearly up to the head.
"You will say that I was puzzled; but if you think so you must have misunderstood the nature of the inductions. To use a sporting phrase, I had not been once 'at fault.' The scent had never for an instant been lost. There was no flaw in any link of the chain. I had traced the secret to its ultimate result; and that result was the nail. It had, I say, in every respect the appearance of its fellow in the other window; but this fact was an absolute nullity (conclusive as it might seem to be) when compared with the consideration that here at this point terminated the clue. "There must be something wrong," I said, "about the nail." I touched it, and the head, with about a quarter of an inch of the shank, came off in my fingers. The rest of the shank was in the gimlet-hole, where it had been broken off. The fracture was an old ono (for its edges were in-crusted with rust), and had apparently been accomplished by the blow of a hammer, which had partially imbedded in the top of the bottom sash the head portion of the nail. I now carefully replaced this head portion in the indentation whence I had taken it, and
