Inasmuch as Jack could not be dissuaded from his purpose, and Wharton began to suspect his friend was half right, the question was decided. Wharton stretched out on the deck, falling asleep almost immediately, and Jack thus found himself the only one with his senses at command and with the safety of the others dependent upon him.
He took his place near the cabin, where the women were slumbering, with his breechloader in hand. He was never more wide awake and was sure he would remain so for hours to come. Wharton had offered to divide the duty with him in acting as sentinel, but our hero preferred to keep the matter in his own hands. He was sure his friend did not realize the full peril of their situation.
The stillness was broken only by the peculiar cries in the jungle, which it may be said were never wholly silent. First on the right, then on the left, then from the front, and again from different points on both sides of the stream he heard the sounds, some faint and far away, with others alarmingly close. The hoarse snarl of the tiger, the finer cry of the leopard, the squawking of night birds, with other noises that he could not identify, were continually in the air. Had they been heard for the first time he would have been in a tremor of fear and nervousness; but man soon becomes accustomed to danger, and the nearest must come still nearer to cause his pulse an additional throb.
Jack Everson was sensible that through this medley of strange noises there was one sound that was continuous and never changing. So faint that at first he and Wharton failed to notice it, it now impressed itself too distinctly upon his consciousness for him to be mistaken. It was a low, steady hum or moaning, such as the traveller hears when miles inland from the ocean. He could not identify it, though he made several guesses, and was still speculating unsatisfactorily, when he received a startling reminder that there was a new peril at his very feet.
The first notice was a faint purring sound, as if made by a gigantic cat, accompanied by a rustling of the vegetation scarcely a dozen feet away. He instantly grasped his rifle with both hands and was alert. It was impossible to distinguish ordinary objects in the gloom, but suddenly two small circles glittered with a greenish light and the purring was succeeded by a low, cavernous growl. Then it all became clear to him: a royal Bengal tiger was stealing upon the boat and was probably gathering himself for a leap at that very moment.
Had all the occupants been asleep the frightful terror would have played sad havoc with them before they could defend themselves. As it was, it looked as if more than one fatality must follow his attack.
But for that phosphorescent gleam of the brute's eyes Jack Everson would not have been able to locate him, but the glow of the two objects defined the outlines and locality of the horrible thing as unmistakably as if the sun were overhead. The occasion was one in which everything depended upon promptness. The tiger was likely to shift his position and turn his head so that the eyes would fail to show.
Jack reflected that there probably were a number of spots in the anatomy of the jungle terror that were more vulnerable than others; that a well-aimed bullet might be instantly fatal in one, while able to inflict only a partial wound in another. Be that as it may, he was sure that a conical bullet driven between the eyes and through bone, muscle and brain by a rifle that could kill a man at the distance of a mile must do effective work when that brain was not a dozen feet distant from the muzzle of the weapon. At any rate, there was no time for inquiry and he did not hesitate.
Aiming for a point midway between the gleaming orbs he pressed the trigger. It takes a well-aimed weapon to kill a royal Bengal tiger, even at a short distance, but Jack's rifle was well aimed. The tiny sphere of lead darted through the brain and along the spinal marrow as if fired with the vicious energy of a charge of dynamite.
It so happened that the tiger was in the act of making his graceful but fearful leap that was to land him upon the breast of the young man, who had risen to his feet just before firing. The check at that instant produced a queer result, the like of which is not often seen. The shock of the bullet crashing into the head of the muscular beast at the instant he was calling into play his prodigious strength intensified that strength to a sudden and astonishing degree. The consequence was that the tiger, instead of making the leap he intended, made one twice as great and overshot the mark. From out the gloom the beautiful sinewy body, of which only a glimpse could be caught, emerged as if fired from the throat of a Columbiad and, curving over the shoulders of the man and the boat, dropped into the stream with a splash that sent the water flying in every direction.