Many traces we found of him in the bog-girt island where he had hid his savage ally. A huge driving-wheel and a shaft half-filled with rubbish showed the position of an abandoned mine. Beside it were the crumbling remains of the cottages of the miners, driven away no doubt by the foul reek of the surrounding swamp. In one of these a staple and chain with a quantity of gnawed bones showed where the animal had been confined. A skeleton with a tangle of brown hair adhering to it lay among the débris.

“A dog!” said Holmes. “By Jove, a curly-haired spaniel. Poor Mortimer will never see his pet again. Well, I do not know that this place contains any secret which we have not already fathomed. He could hide his hound, but he could not hush its voice, and hence came those cries which even in daylight were not pleasant to hear. On an emergency he could keep the hound in the out-house at Merripit, but it was always a risk, and it was only on the supreme day, which he regarded as the end of all his efforts, that he dared do it. This paste in the tin is no doubt the luminous mixture with which the creature was daubed. It was suggested, of course, by the story of the family hell-hound, and by the desire to frighten old Sir Charles to death. No wonder the poor devil of a convict ran and screamed, even as our friend did, and as we ourselves might have done, when he saw such a creature bounding through the darkness of the moor upon his track. It was a cunning device, for, apart from the chance of driving your victim to his death, what peasant would venture to inquire too closely into such a creature should he get sight of it, as many have done, upon the moor? I said it in London, Watson, and I say it again now, that never yet have we helped to hunt down a more dangerous man than he who is lying yonder”—he swept his long arm towards the huge mottled expanse of green-splotched bog which stretched away until it merged into the russet slopes of the moor.