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 then let go his grip. In an instant it had been whisked away by the weight of the stone, had struck with a sharp crack against the parapet, and had vanished over the side into the water. It had hardly gone before Holmes was kneeling beside the stonework, and a joyous cry showed that he had found what he expected.

“Was there ever a more exact demonstration?” he cried. “See, Watson, your revolver has solved the problem!” As he spoke he pointed to a second chip of the exact size and shape of the first which had appeared on the under edge of the stone balustrade.

“We’ll stay at the inn to-night,” he continued, as he rose and faced the astonished sergeant. “You will, of course, get a grappling-hook and you will easily restore my friend’s revolver. You will also find beside it the revolver, string and weight with which this vindictive woman attempted to disguse her own crime and to fasten a charge of murder upon an innocent victim. You can let Mr. Gibson know that I will see him in the morning, when steps can be taken for Miss Dunbar’s vindication.”

Late that evening, as we sat together smoking our pipes in the village inn, Holmes gave me a brief review of what had passed.

“I fear, Watson,” said he, “that you will not improve any reputation which I may have acquired by adding the Case of the Thor Bridge Mystery to your annals. I have been sluggish in mind and wanting in that mixture of imagination and reality which is the basis of my art. I confess that the chip in the stone