The Hoop
The Price
A Matter of Size
The Hole in the Floor
General Hardy's Profession
Show Cause
Not With a Bang
The Talent of Harvey
The Mind of God
UFO
Cephes 5
The Pragmatic Seed
The Egg

"The Hoop" appeared in Magazine of F&SF in 1972. The rest may be original to the 1973 hardcover edition, or have appeared in non-SF sources.