Contents:
THE HIDDEN WORLD by Edmond Hamilton
A VISIT TO VENUS by Festus Pragnell
CHILDREN OF THE RAY by J. Harvey Haggard
THE MOLTEN BULLET by Anthony Rud
RED SHARDS ON CERES by Raymond Z. Gallun
THE STAR SLAVER by Carter Sprague
THE IDEAL by Stanley G. Weinbaum
DEATH AT THE OBSERVATORY by John Russell Fearn
COSMIC STAGE by Robert Arthur
TRESPASS by Poul Anderson and Gordon Dickson