I must cover this up, quick." And seizing the stone slab by the handle, he lifted it as if it had been a pot-lid, and let it down into its place.

"Now," said he, "get down, and let us all go away from this place.

Those negroes may be back at any moment." When Ralph found that his sister had fainted, and that Mrs.Cliff did not know it, there was a little commotion at the foot of the mound.

But some water in a pool near by soon revived Edna, and in ten minutes the party was on the plateau outside the caverns.

The new moon was just beginning to peep over the rocks behind them, and the two ladies had seated themselves on the ground.