“I don’t think that you have any cause to be uneasy, Mrs. Hudson,” I answered. “I have seen him like this before. He has some small matter upon his mind which makes him restless.” I tried to speak lightly to our worthy landlady, but I was myself somewhat uneasy when through the long night I still from time to time heard the dull sound of his tread, and knew how his keen spirit was chafing against this involuntary inaction.

At breakfast-time he looked worn and haggard, with a little fleck of feverish color upon either cheek.

“You are knocking yourself up, old man,” I remarked. “I heard you marching about in the night.”