When confronted with his cravat, he turned very pale, and was utterly unable to account for its presence in the hand of the murdered man. His wet clothing showed that he had been out in the storm of the night before, and his stick, which was a Penang-lawyer weighted with lead, was just such a weapon as might, by repeated blows, have inflicted the terrible injuries to which the trainer had succumbed. On the other hand, there was no wound upon his person, while the state of Straker’s knife would show that one at least of his assailants must bear his mark upon him. There you have it all in a nutshell, Watson, and if you can give me any light I shall be infinitely obliged to you.”

I had listened with the greatest interest to the statement which Holmes, with characteristic clearness, had laid before me. Though most of the facts were familiar to me, I had not sufficiently appreciated their relative importance, nor their connection to each other.

“Is it not possible,” I suggested, “that the incised wound upon Straker may have been caused by his own knife in the convulsive struggles which follow any brain injury?”