, They had made every preparation for concealing themselves within the water cavern for the night should the. robbers return to their camp. They were far too feeble as yeb to make the voyage home rowing with one pair ot oars; and, be sides, Cliff seemed to find a fascination m the spot, and to cherish vague hopes that Tony raighb have his plunder indden there, and thab bhey mighb catch some clue to it if only they looked long enough. They had chosen their retreat in a curious nook in the wall of the cavern near its entrance, screened by a curtain of stone, and having a clefb through which they could view the camping grouna. They had appropriated a few rations of the campers' provisions, taking care to leave as little trace as possible ; and as Mabel had slumbered all day in her weak ness on the warm grass, towards evening the boys gently carried her back to her couch of rugs in the boat; and kept up a close search of tho whole place until they saw what they bad expected, the campera returning to their camp. A largo boat pushed out from the forest, clad mainland and pointed toward the Wand. The boys stepped into their little crafb and glided into the gloom of the cavern, tied the boat, bow and stern under the loop hole, and stood together, looking through and waiting. It was now evening, warm and mellow a rich sunset spread a glory over the emerald mead and the bit of rippling water beyond Suddenly tho big boat appeared on the water, propelled by half-a-dozen stout Towers, and instantly the quiet bush was broken by the noise of coarse voices and plashing oars, much louder than seemed natural. ~ , In fact the rocky nook was a capital con ductor of sound, and bore the faintest breath-exaggerated more than twice ite real volume —right into the deft which opened| X an ear in the end of the niche The boys nudged each other m sign of their satisfaction ; they were not only to see, bub to hear all that went on. 