Now before us, out from the wall, jutted a low terrace. It was all of a pearly rose-coloured stone, slender, graceful pillars of the same hue. The face of the terrace was about ten feet high, and all over it ran a bas-relief of what looked like short-trailing vines, surmounted by five stalks, on the tip of each of which was a flower.

We passed along the terrace. It turned in an abrupt curve. I heard a hail, and there, fifty feet away, at the curving end of a wall identical with that where we stood, were Larry and Marakinoff. Obviously the left side of the chamber was a duplicate of that we had explored. We joined. In front of us the columned barriers ran back a hundred feet, forming an alcove. The end of this alcove was another wall of the same rose stone, but upon it the design of vines was much heavier.

We took a step forward⁠—there was a gasp of awe from the Norseman, a guttural exclamation from Marakinoff. For on, or rather within, the wall before us, a great oval began to glow, waxed almost to a flame and then shone steadily out as though from behind it a light was streaming through the stone itself!