"I was staggered for the moment," he said, "but the thing is quite natural.

My memory failed me, or I should have been able to foretell it.

There is nothing more to be learned here.

Let us go down." "What is your theory, then, as to those footmarks ?" I asked, eagerly, when we had regained the lower room once more.
"My dear Watson, try a little analysis yourself," said he, with a touch of impatience.

"You know my methods.