CHAPTER XXXI.

IN WHICH YOU READ OF THE GLORIOUS CAVERNS OF WHITE MARBLE FRONTING ON THE WONDERFUL RIVER.—IN THE TROPICS OF THE UNDER WORLD.—HOW WE CAME UPON A SOLITARY WANDERER ON THE BANKS OF THE RIVER.—MY CONVERSATION WITH HIM, AND MY JOY AT FINDING MYSELF IN THE LAND OF THE RATTLEBRAINS, OR HAPPY FORGETTERS.—BRIEF DESCRIPTION OF THEM. 217