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 back upon this one. I think we’ll shut that window again, if you don’t mind. It is a singular thing, but I find that a concentrated atmosphere helps a concentration of thought. I have not pushed it to the length of getting into a box to think, but that is the logical outcome of my convictions. Have you turned the case over in your mind?”

“Yes, I have thought a good deal of it in the course of the day.”

“What do you make of it?”

“It is very bewildering.”

“It has certainly a character of its own. There are points of distinction about it. That change in the footprints, for example. What do you make of that?”

“Mortimer said that the man had walked on tiptoe down that portion of the alley.”

“He only repeated what some fool had said at the inquest. Why should a man walk on tiptoe down the alley?”

“What then?”

“He was running, Watson—running desperately, running for his life, running