The scant amount of food now remaining was a source of great uneasiness, but Chutney infused fresh hope into the party by the confident prediction that if the present daily rate of speed were maintained the supply would last until the end of the journey. Already the pure air of the cavern had done wonders for Sir Arthur and the colonel, and they had nearly recovered their usual health and strength. The one canoe held them all very comfortably, and they seemed to make better progress than when they had been divided into separate parties. That night nothing occurred to cause any alarm, and they resumed the cruise in fairly good spirits. The river still continued narrow and the current swift. No dangerous water was encountered, and everything was going on satisfactorily when Guy suddenly shouted with all his might, "Back water! Quick! quick!" and looking ahead they saw a steep rocky promontory, against which the current split and swung off into two channels, one to the right, the other to the left. In spite of their utmost efforts they continued to float down inch by inch. Which was the proper channel? It was a puzzling problem on which perhaps hung life and death. There was no time for consideration, and under the circumstances Guy adopted the only possible course. "Head the canoe straight for the center of the rock and let her drift," he cried. "The current shall decide for us." This was instantly done and they drifted with perfect accuracy straight for the splitting point in the stream. For a moment it looked as though they would be flung against the rocks and upset, but as the canoe reached the turning-point it trembled an instant in the balance and then darted headlong into the channel to the right. "A good omen," cried the colonel. "The river Juba lies on our right. This must be the proper channel." It was a very narrow channel, at all events, and a very swift one, too, for the rocky walls on either side were almost close enough to touch with the paddles, and they were moving at a dizzy rate of speed. "There are rapids below us," said Forbes. "I can hear them dimly." Melton's hearing was unusually acute, for as yet the rest could hear nothing, but in a few seconds the distant roar was audible to all, and it grew ominously louder with every second. They grasped the sides of the canoe in anxious suspense--for it was useless to paddle--and the angry waters were almost in sight, when Sir Arthur dropped his torch, and instantly they were plunged in total darkness. No time remained to strike a fresh light. The sullen crash of the waters drowned the sound of their voices, and the canoe blindly took its own course and they felt the chill spray spattering their faces. "Bump, bump, bump," went the quivering boat, grinding and crashing on loose rocks, and then with one terrific lurch, that sent them sprawling on their knees, the violent tossing subsided and the choppy waves smacked the bottom of the canoe.