Using hypnosis and a dark liquid, the mystic and scientist Oliver Kent sends the
superconscious minds of his life-long friends Donald and Joane Cromwell back to the
Pleistocene where they inhabit prehuman existences of themselves and discover the origin of
Joane’s present-day unease. The Brontosaurus who makes an appearance is out of place in the
Pleistocene, but never mind.
Joane Cromwell was the maiden name of Skidmore’s wife, and
her name shows up as a character in several of Skidmore’s stories, although not as the same
character. However, Oliver Kent does show up in a later story, “The First
Flight,” where he once again sends a friend into a previous incarnation.