The Wall Around the World - novelette by Theodore R. Cogswell [as by Theodore Cogswell]
Protected Species - short story by H. B. Fyfe
Before Eden - short story by Arthur C. Clarke
The Rescuer - short story by Arthur Porges
I Made You - short story by Walter M. Miller, Jr.
The Country of the Kind - short story by Damon Knight
MS. Found in a Chinese Fortune Cookie - short story by C. M. Kornbluth
The Cage - short story by A. Bertram Chandler [as by Bertram Chandler]
Eastward Ho! - short story by William Tenn
The Windows of Heaven - short story by John Brunner
Common Time - short story by James Blish
Fulfilment - novelette by A. E. van Vogt (variant of Fulfillment 1951)