Thorndyke carrying the light and I the indispensable green case.
"I am a little in the dark about this affair," I said, when we had allowed the two officials to draw ahead out of earshot; "you came to a conclusion remarkably quickly. What was it that so immediately determined the opinion of murder as against suicide?"
"It was a small matter but very conclusive," replied Thorndyke. "You noticed a small scalp-wound above the left temple? It was a glancing wound, and might easily have been made by the engine. But—the wound had bled; and it had bled for an appreciable time. There were two streams of blood from it, and in both the blood was firmly clotted and partially dried. But the man had been decapitated; and this wound, if inflicted by the engine, must have been made after the decapitation, since it was on the side most distant from the engine as it approached. Now, a decapitated head does not bleed. Therefore, this wound was inflicted before the decapitation.
"But not only had the wound bled: the blood had trickled down in two streams at right angles to one another. First, in the order of time as shown by the appearance of the stream, it had trickled down the side of the face and dropped on the collar. The second stream ran from the wound to the back of the head. Now, you know, Jervis,
