Sturgeon in Orbit

This collection begins with "Extrapolation"-- a story about a woman whose faith in her husband changes the way the world looks at historic events. It ends with "The Incubi of Parallel X" which concerns itself with aliens, parallel worlds, and a new dark age. Along the way the stories (6 in total) wander through mysteriously murdered scientists and tripartate aliens who are forced to assume human flesh. Also entertaining are the anecdotes about various editors from Sturgeon's past which preface every story.Like Clifford Simak and Philip K. Dick, he's as interested in character as in plot. The result is clear in this collection of well-written and very entertaining stories.

Typical Sturgeon short stories, I thought they were all good until I got to the last one, The Incubus of Parallel X, and it took my breath away. Where in the world did he get his ideas?