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 minutes and think it out.” He seated himself upon the stone ledge of the bridge, and I could see his quick grey eyes darting their questioning glances in every direction. Suddenly he sprang up again and ran across to the opposite parapet, whipped his lens from his pocket, and began to examine the stonework.

“This is curious,” said he.

“Yes, sir, we saw the chip on the ledge. I expect it’s been done by some passer-by.”

The stonework was grey, but at this one point it showed white for a space not larger than a sixpence. When examined closely one could see that the surface was chipped as by a sharp blow.

“It took some violence to do that,” said Holmes thoughtfully. With his cane he struck the ledge several times without leaving a mark. “Yes, it was a hard knock. In a curious place, too. It was not from above but from below, for you see that it is on the lower edge of the parapet.”

“But it is at least fifteen feet from the body.”

“Yes, it is fifteen feet from the body. It may have nothing to do with the matter, but it is a point worth noting. I do not think that we have anything more to learn here. There were no footsteps, you say?”

“The ground was iron hard, sir. There were no traces at all.”

“Then we can go. We will go up to the house first and look over these weapons of which you speak. Then we shall get on to Winchester, for I should desire to see Miss Dunbar before we go farther.”

Mr. Neil Gibson had not returned from town, but we saw in the house the neurotic Mr. Bates who had