returned from their expedition, and the negroes could be let down to attend to their own wants.
After they had eaten, the Africans went to a spot which commanded a view up the ravine, as well as the whole of the bay, and there they hid themselves, and watched as long as it was daylight, so that if any of the Rackbirds had escaped they could see them. But they saw nothing, and being very anxious to find good white people who would take care of them, they started out before dawn that morning to look for the shipwrecked party about whom Cheditafa had heard the Rackbirds talking, and with whom they hoped to find their companion Mok, and thus it was that they were here.
"And those men were coming to attack us last night?" asked the captain.
"You are sure of that?"
"Yes," said Cheditafa, "it was last night. They not know how many you are, and all were coming."
"And some of them had already been here?"
"Yes," replied the African. "One day before, three went out to look for Mok, and they found his track and more track, and they waited in the black darkness, and then came here, and they heard you all sleep and snore that night. They were to come again, and if they—"
"And yesterday afternoon the lake came down and swept them out of existence!" exclaimed Mrs. Cliff.
CHAPTER X
THE CAPTAIN EXPLORES
Captain Horn had heard the story of Cheditafa, he walked away from the rest of the party, and stood, his eyes upon the ground, still mechanically holding his gun. He now knew that the great danger he had feared had been a real one, and far greater than he had imagined. A systematic attack by all the Rackbirds would have swept away his single resistance as the waters had swept them and their camp away. As to parley or compromise with those wretches, he knew that it would have been useless to think of it. They allowed no one to go forth from their hands to reveal the place of their rendezvous.
But although he was able to appreciate at its full force the danger with which they had been threatened, his soul could not immediately adjust itself to the new conditions. It had been pressed down so far that it could not easily rise again. He felt that he must make himself believe in the relief which had come to them, and, turning sharply, he called out to Cheditafa:
"Man, since you have been in this part of the country, have you ever seen or heard of any wild beasts here? Are there any jaguars or pumas?"
The African shook his head. "No, no," said he, "no wild beasts. Everybody sleep out of doors. No think of beasts—no snakes."
The captain dropped his gun upon the ground. "Miss Markham!" he exclaimed. "Mrs. Cliff! I truly believe we are out of all danger—that we—"
But the two ladies had gone inside, and heard him not. They appreciated to the full the danger from which they had been delivered. Ralph, too, had gone. The captain saw him on his post of observation, jamming the end of his flagpole down between two rocks.
"Hello!" cried the boy, seeing the captain looking up at him, "we might as well have this flying here all the time. There is nobody to hurt us now, and we want people to know where we are."
The captain walked by the little group of Africans, who were sitting on the ground, talking in their native tongue, and entered the passage. He climbed over the barrier, and went to the lake. He did not wish to talk to anybody, but he felt that he must do something, and now was a good time to carry out his previous intention to cross over the empty bed of the lake and to look out of the opening on the other side. There was no need now to do this for purposes of vigilance, but he thought that if he could get out on the other side of the cave he might discover some clew to the disappearance of the lake.
He had nearly crossed the lake bottom, when suddenly he stopped, gazing at something which stood before him, and which was doubtless the object he had struck when swimming. The sun was now high and the cave well lighted, and with a most eager interest the captain examined the slimy and curious object on which his feet had rested when it was submerged, and from which he had fallen. It was not the horizontal trunk of a tree with a branch projecting from it at right angles. It was nothing that was natural or had grown. It was plainly the work of man. It was a machine.
At first the captain thought it was made of wood, but afterwards he believed it to be of metal of some sort. The horizontal portion of it was a great cylinder, so near the bottom of the lake that he could almost touch it with his hands, and it was supported by a massive framework. From this projected a long limb or bar, which was now almost horizontal, but which the captain believed to be the thick rod which had stood upright when he clutched it, and which had yielded to his weight and had gone down with him. He knew now what it was: it was a handle that had turned.
He hurried to the other end of the huge machine, where it rested against the rocky wall of the cavern. There he saw in the shadow, but plain enough now that he was near it, a circular aperture, a yard or more in diameter. Inside of this was something which looked like a solid wheel, very thick, and standing upright in the opening. It was a valve. The captain stepped back and gazed for some minutes at this great machine which the disappearance of the water had revealed. It was easy for him to comprehend it now.
"When I slipped and sank," he said to himself, "I pulled down that lever, and I opened the water-gate and let out the lake."
The captain was a man whose mind was perfectly capable of appreciating novel and strange impressions, but with him such impressions always connected themselves, in one way or another, with action: he could not stand and wonder at the wonderful which had happened—it always suggested something he must do. What he now wanted to do was to climb up to the great aperture which lighted the cavern, and see what was outside. He could not understand how the lake could have gone from its basin without the sound of the rushing waters being heard by any one of the party.
With some difficulty, he climbed up to the cleft and got outside. Here he had a much better view of the topography of the place than he had yet been able to obtain. So far as he had explored, his view toward the interior of the country had been impeded by rocks and hills. Here he had a clear view from the mountains to the sea, and the ridge which he had before seen to the southward he could now examine to greater advantage. It was this long chain of rocks which had concealed them from their enemies, and on the other side of which must be the ravine in which the Rackbirds had made their camp.
Immediately below the captain was a little gorge, not very deep nor wide, and from its general trend toward the east and south the captain was sure that it formed the upper part of the ravine of the Rackbirds. At the bottom of it there trickled a little stream. To the northeast ran another line of low rock, which lost itself in the distance before it blended into the mountains, and at the foot of this must run the stream which had fed the lake.
In their search for water, game, or fellow-beings, no one had climbed these desolate rocks, apparently dry and barren. But still the captain was puzzled as to the way the water had gone out of the lake. He did not believe that it had flowed through the ravine below. There were no signs that there had been a flood down there. Little vines and plants were growing in chinks of the rocks close to the water. And, moreover, had a vast deluge rushed out almost beneath the opening which lighted the cave, it must have been heard by some of the party. He concluded, therefore, that the water had escaped through a subterranean channel below the rocks from which he looked down.
He
