He loosened one of his automatics with a suggestive movement.
"After you, Professor," he bowed, politely, to the Russian. We parted and set forth.
The chamber widened out from the portal in what seemed to be the arc of an immense circle. The shining walls held a perceptible curve, and from this curvature I estimated that the roof was fully three hundred feet above us.
The floor was of smooth, mosaic-fitted blocks of a faintly yellow tinge. They were not light-emitting like the blocks that formed the walls. The radiance from these latter, I noted, had the peculiar quality of thickening a few yards from its source, and it was this that produced the effect of misty, veiled distances. As we walked, the seven columns of rays streaming down from the crystalline globes high above us waned steadily; the glow within the chamber lost its prismatic shimmer and became an even grey tone somewhat like moonlight in a thin cloud.
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!
And within the roseate oval two flame-tipped shadows appeared, stood for a moment, and then seemed to float out upon its surface. The shadows wavered; the tips of flame that nimbused them with flickering points of vermilion pulsed outward, drew back, darted forth again, and once more withdrew themselves—and as they did so the shadows thickened—and suddenly there before us stood two figures!
One was a girl—a girl whose great eyes were golden as the fabled lilies of Kwan-Yung that were born of the kiss of the sun upon the amber goddess the demons of Lao-Tz'e carved for him; whose softly curved lips were red as the royal coral, and whose golden-brown hair reached to her knees!
And the second was a gigantic frog—A woman frog, head helmeted with carapace of shell around which a fillet of brilliant yellow jewels shone; enormous round eyes of blue circled with a broad iris of green; monstrous body of banded orange and white girdled with strand upon strand of the flashing yellow gems; six feet high if an inch, and with one webbed paw of its short, powerfully muscled forelegs resting upon the white shoulder of the golden-eyed girl!