was this lady still clasping it in her left hand? Why should she carry it so carefully? She did not need to refer to it in the interview. Does it not seem remarkable?”
“Well, sir, as you put it, perhaps it does.”
“I think I should like to sit quietly for a few minutes and think it out.” He seated himself upon the stone ledge of the bridge, and I could see his quick gray 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 passerby.”
The stonework was gray, 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