I sprang to my feet, my inert hand grasping my pistol, my mind paralyzed by the dreadful shape which had sprung out upon us from the shadows of the fog. A hound it was, an enormous coal-black hound, but not such a hound as mortal eyes have ever seen. Fire burst from its open mouth, its eyes glowed with a smouldering glare, its muzzle and hackles and dewlap were outlined in flickering flame. Never in the delirious dream of a disordered brain could anything more savage, more appalling, more hellish be conceived than that dark form and savage face which broke upon us out of the wall of fog.
With long bounds the huge black creature was leaping down the track, following hard upon the footsteps of our friend. So paralyzed were we by the apparition that we allowed him to pass before we had recovered our nerve. Then Holmes and I both fired together, and the creature gave a hideous howl, which showed that one at least had hit him. He did not pause, however, but bounded onward. Far away on the path we saw Sir Henry looking back, his face white in the moonlight, his hands raised in horror, glaring helplessly at the frightful thing which was hunting him down.
But that cry of pain from the hound had blown all our fears to the winds. If he was vulnerable he was mortal, and if we could wound him we could kill him. Never have I seen a man run as Holmes ran that night. I am reckoned fleet of foot, but he outpaced me as much as I outpaced the little professional. In front of us as we flew up the track we heard scream after scream from Sir Henry and the deep roar of the hound. I was in time to see the beast spring upon its victim, hurl him to the ground, and worry at his throat. But the next instant Holmes had emptied five barrels of his revolver into the creature's flank. With a last howl of agony and a vicious snap in the air, it rolled upon its back, four feet pawing furiously, and then fell limp upon its side. I stooped, panting, and pressed my pistol to the dreadful, shimmering head, but it was useless to press the trigger. The giant hound was dead.
Sir Henry lay insensible where he had fallen. We tore away his collar, and Holmes breathed a prayer of gratitude when we saw that there was no sign of a wound and that the rescue had been in time. Already our friend's eyelids shivered and he made a feeble effort to move. Lestrade thrust his brandy-flask between the baronet's teeth, and two frightened eyes were looking up at us.
"My God!" he whispered. "What was it? What, in heaven's name, was it?"
"It's dead, whatever it is," said Holmes. "We've laid the family ghost once and forever."
In mere size and strength it was a terrible creature which was lying stretched before us. It was not a pure bloodhound and it was not a pure mastiff; but it appeared to be a combination of the two--gaunt, savage, and as large as a small lioness. Even now, in the stillness of death, the huge jaws seemed to be dripping with a bluish flame and the small, deep-set, cruel eyes were ringed with fire. I placed my hand upon the glowing muzzle, and as I held them up my own fingers smouldered and gleamed in the darkness.
"Phosphorus," I said.
"A cunning preparation of it," said Holmes, sniffing at the dead animal. "There is no smell which might have interfered with his power of scent. We owe you a deep apology, Sir Henry, for having exposed you to this fright. I was prepared for a hound, but not for such a creature as this. And the fog gave us little time to receive him."
"You have saved my life."
"Having first endangered it. Are you strong enough to stand?"
"Give me another mouthful of that brandy and I shall be ready for anything. So! Now, if you will help me up. What do you propose to do?"
"To leave you here. You are not fit for further adventures to-night. If you will wait, one or other of us will go back with you to the Hall."
He tried to stagger to his feet; but he was still ghastly pale and trembling in every limb. We helped him to a rock, where he sat shivering with his face buried in his hands.