Astounding Stories of Super-Science, May, 1930

MURDER MADNESS by MURRAY LEINSTER
Murder Madness! Seven Secret Service Men Had Completely Disappeared. Another Had Been Found a Screaming, Homicidal Maniac, Whose Fingers Writhed Like Snakes. So Bell, of the Secret "Trade," Plunges into South America After The Master--the Mighty, Unknown Octopus of Power Whose Diabolical Poison Threatens a Continent! (Beginning a Four-part Novel.)

BRIGANDS OF THE MOON by RAY CUMMINGS 95
Gregg and Anita Risk Quick, Sure Death in a Desperate Bluff on the Ruthless Martian Brigands. (Part Three of a Four-part Novel.)

THE JOVIAN JEST by LILITH LORRAINE
There Came to Our Pigmy Planet a Radiant Wanderer with a Message--and a Jest--from the Vasty Universe.

THE ATOM-SMASHER by VICTOR ROUSSEAU
Four Destinies Rocket Through the Strange Time-Space of the Fourth Dimension in Tode's Marvelous Atom-Smasher. (A Complete Novelette.)