Even as Sarka asked himself this question fresh Aircars shot from the rims of Moon craters, rushing outward to add their weight in the battle against the Gens of Dalis. The Gens of Dalis was doomed! In the mind of Sarka the Second there still loomed a hellish doubt that would not down. The men of Cleric were surrounding Jaska now, protecting her with their lives against the tentacles of that lone Aircar splashed with crimson--and all were flying a losing race with the Earth, which was still being forced outward from the Moon! * * * * * _IN THE NEXT ISSUE_ ON THE PLANET OF DREAD _An Exciting Interplanetary Story_ By R. F. Starzl EARTH, THE MARAUDER _Part Two of the Thrilling Novel_ By Arthur J. Burks THE FLYING CITY _A Novelet Concerning an Amazing Aerial Metropolis_ By H. Thompson Rich MURDER MADNESS _The Conclusion of the Gripping Continued Novel_ By Murray Leinster ----And Others! * * * * * [Illustration: Marable, in a desperate frenzy, hacked at the reptile's awful head.] From An Amber Block _By Tom Curry_ "These should prove especially valuable and interesting without a doubt, Marable," said the tall, slightly stooped man. He waved a long hand toward the masses of yellow brown which filled the floor of the spacious workrooms, towering almost to the skylights, high above their heads. [Sidenote: A giant amber block at last gives up its living, ravenous prey.] "Is that coal in the biggest one with the dark center?" asked an attractive young woman who stood beside the elder of the men. "I am inclined to believe it will prove to be some sort of black liquid," said Marable, a big man of thirty-five. There were other people about the immense rooms, the laboratories of the famous Museum of Natural History. Light streamed in from the skylights and windows; fossils of all kinds, some immense in size, were distributed about. Skilled specialists were chipping away at matrices other artists were reconstructing, doing a thousand things necessary to the work. A hum of low talking, accompanied by the irregular tapping of chisels on stone, came to their ears, though they took no heed of this, since they worked here day after day, and it was but the usual sound of the paleontologists' laboratory. Marable threw back his blond head. He glanced again toward the dark haired, blue eyed young woman, but when he caught her eye, he looked away and spoke to her father, Professor Young. "I think that big one will turn out to be the largest single piece of amber ever mined," he said. "There were many difficulties in getting it out, for the workmen seemed afraid of it, did not want to handle it for some silly reason or other." * * * * *