There was a shaded, shadowless twilight under the cloud-bank. The ground looked like no ground ever seen before by anyone. Off to the right a rivulet ran between improbable-seeming banks. There were a few very small hills of most unlikely appearance. It was the ground, the matter on which one would walk, which was strangest. It had color, but the color was not green. Much of it was a pallid, dirty-yellowish white. But there were patches of blue, and curious veinings of black, and here and there were other colors, all of them unlike the normal color of vegetation on a planet with a sol-type sun. Harper spoke from the direction-finder; "The signal's coming from that mound, yonder." There was a hillock of elongated shape directly in line with the _Nadine's_ course in descent. Except for the patches of color, it was the only considerable landmark within the half-mile circle in which anything could be seen at all. The _Nadine_ checked her downward motion. Interplanetary drive is rugged and sure, but it does not respond to fine adjustment. Burleigh used rockets, issuing great bellowings of flame, to make actual contact. The yacht hovered, and as the rocket-flames diminished slowly she sat down with practically no impact at all. But around her there was a monstrous tumult of smoke and steam. When the rockets went off, she lay in a burned-out hollow some three or four feet deep with a bottom of solid stone. The walls of the hollow were black and scorched. It seemed that at some places they quivered persistently. There was silence in the control-room save for the whining noise which now was almost deafening. Harper snapped off the switch. Then there was true silence. The space-yacht had come to rest possibly a hundred yards from the mound which was the source of the space-signal. That mound shared the peculiarity of the ground as far as they could see through the haze. It was not vegetation in any ordinary sense. Certainly it was no mineral surface! The landing-pockets had burned away three or four feet of it, and the edge of the burned area smoked noisesomely, and somehow it looked as if it would reek. And there were places where it stirred. Burleigh blinked and stared. Then he reached up and flicked on the outside microphones. Instantly there was bedlam. If the landscape was strange, here, the sounds that came from it were unbelievable. * * * * *