THE DESCENT UPON VULCAN took another twenty-four hours. Then at last we had passed through a cloud-bank and, at some twenty thousand feet, the new world stretched dark and bleak beneath us. It certainly looked—to Jan’s intense disappointment—wholly uninhabited. It was a tumbled, rocky landscape, barren and forbidding. Beneath us there were black ravines and canyons, little jagged peaks and hill-top spires, some of them sharp as needle-points. Off at one of the distant horizons the tiered land, rising up, stretched into the foothills of serrated ranks of mountain peaks which loomed over the jagged dark horizon line. A great metal desert here. In the fitful starlight, and the mellow light of little crescent Mercury which hung over the mountains like a falling, new moon, the metallic quality