I find it recorded in my notebook that it was a bleak and windy day towards the end of March in the year 1892. Holmes had received a telegram while we sat at our lunch, and he had scribbled a reply. He made no remark, but the matter remained in his thoughts, for he stood in front of the fire afterwards with a thoughtful face, smoking his pipe, and casting an occasional glance at the message. Suddenly he turned upon me with a mischievous twinkle in his eyes."I suppose, Watson, we must look upon you as a man of letters," said he. "How do you define the word 'grotesque'?""Strange-remarkable," I suggested.He shook his head at my definition."There is surely something more than that," said he; "some underlying suggestion of the tragic and the terrible. If you cast your mind back to some of those narratives with which you have afflicted a long-suffering public, you will recognize how often the grotesque has deepened into the criminal. Think of that little affair of the red-headed men. That was grotesque enough in the outset, and yet it ended in a desperate attempt at robbery. Or, again, there was that most grotesque affair of the five orange pips, which let straight to a murderous conspiracy. The word puts me on the alert.