He stepped noiselessly up to the entrance, but recoiled instantly at the sight he beheld, and it was with difficulty that he stifled a cry of alarm. At a distance of about four yards, the outline of its magnificent figure clearly revealed in the bright moonlight, a lion of the largest size was crouching, evidently preparing itself to spring! Frank had never seen one of these animals, except in captivity. About a twelvemonth before, during his stay in London, Captain Wilmore had taken him to Exeter 'Change, where one or two lions were exhibited. But these were small of their kind, and enfeebled by age and long captivity. They bore no more resemblance to the glorious and terrible creature with which Frank was now confronted, than the trickling stream which glides lazily over the ledge of the rocks bears to the foaming cataract, swollen by snows and rains. He perceived in a moment what had taken place. The lion had come to the water to drink; and the dog, scenting the approach of some beast of prey, had possessed itself of the remains of the steinbok, which would otherwise fall a prey to the marauder. The lion in its turn had discovered the vicinity of food, and had leaped down from the rock to seize it. All this passed through Frank's mind in a moment. It could hardly be called thinking, but was rather like a sudden revelation. He felt, too, the necessity of killing the monster without a moment's loss of time, or all their lives would be imperilled. He stooped noiselessly, and picked up the nearest gun, which chanced by good fortune to be Captain Renton's rifle. Frank was a steady shot, as the reader has already been told; but he had never fired at a mark like this. He recalled, on the instant, what he had heard Mr Lavie say that the only spots in a wild animal's body in which a bullet could be lodged with the certainty of causing instant death, were the ear, the eye, and immediately behind the shoulder, where there was a direct passage to the heart. It was impossible to aim at either ear or shoulder in the present instance, as the animal was standing directly facing him. The eye, therefore, which flashed large and yellow upon him in the broad glare of the moonlight--the eye must be his mark. He raised the rifle and brought it down to the level of his eye, drawing trigger the moment he had done so. It was well for him that his aim was true, and his hand steady. As the barrel dropped to its place, the metal flashed in the moonbeam, and its glitter seemed to rouse the creature from its momentary torpor. It rose into the air at the very moment at which the bullet struck it, and if the latter had not been aimed with the most perfect accuracy, there would have been an end of the mastiff, and probably of his master also. But the shot passed directly through the eyeball, and lodged in the brain, causing instantaneous death. The muscular power communicated to the limbs failed even before the leap was accomplished.