It was here fairly light; indeed, a single ray of sunlight played upon the splashing water in the little stream, and the spray sparkled in the gleam. But still very little sunlight ever entered the place. The great wall of rock that reared itself in a plumb-line two thousand feet into the sky, overshadowed it completely on the one side; and on the other were the great trees of this primæval forest towering up three hundred feet or more, and extending their branches above across almost to the rock, though below, the nearest trunk was quite fifty yards away. They stood, in fact, upon the edge of a semi-circular clearing that extended for a distance of perhaps a hundred yards, its radius being about fifty yards if taken from the centre of the exposed portion of the cliff. At each end of this space the trees and undergrowth closed in again upon the rock in an impenetrable tangled mass, denser, and darker even, than that through which the explorers had been slowly cutting their way. Some of the Indians were grouped round the stream, two or three enjoying the luxury of wading in it, or sitting on the bank and dangling their feet in the clear cool water. Matava and the others were busy upon some kind of rough carpentering. Templemore and Elwood saw that the stream issued from a hole in the rock near one end of the clearing; and this was of itself a matter for surprise. They were, however, still more astonished when Monella, with a strange smile, pointed out another aperture in the rock near the centre of the open portion of the cliff. It was about sixteen or eighteen feet from the ground, and was not unlike a window or embrasure in a stone building of considerable thickness. Within--at a distance of eighteen inches or so--it seemed however to be closed by solid rock.