Astounding Science Fiction June 1956 (Volume 57, Number 4)
Illustrations by Kelly Freas, H. R. van Dongen. Cover by Kelly Freas (for "Plus X.")

Novelettes: "Plus X" by Eric Frank Russell (2 expansions: The Space Willies & Next of Kin)
"The Chosen People" by Robert Randall (Robert Silverberg & Randall Garrett: 1st of the "Nidor" series; formed part of The Shrouded Planet.)

Stories: "The Peasant Girl" by Paul Janvier (Algis Budrys)
"The Live Coward" by Poul Anderson
"Sea Change" by Thomas N. Scortia.

Articles: "Artistic Detail" (photo & some details on the model Freas made for the gun on the cover);
"Psionic Machine - Type One" by John W. Campbell, Jr.

John W. Campbell's editorial is "The Problem of Psionics"; Book reviews by P. Schuyler Miller.