"Call Him Demon" (Thrilling Wonder Stories, Fall 1946) -- In 1920, a group of children know that the "Wrong Uncle" is really part of a very strange and very dangerous being. Besides being a creepy horror story, this tale offers a great deal of insight in the psychology of children.
"Daemon" (Famous Fantastic Mysteries, October 1946) -- Narrated by a simple-minded who can see the daemons of people, as well as beings from pre-Christian mythology. A vivid, exotic fantasy.
"Vintage Season" (Astounding, September 1946) -- Famous story about tourists from the future. Beautifully written. Adapted into a 1992 movie I have not seen, variously known as Timescape (no relation to the novel by Gregory Benford), Disaster in Time, and Grand Tour: Disaster in Time.
"Dark Angel" ("The Dark Angel," Startling Stories, March 1946) -- A man learns that his wife is a superhuman mutant, growing from her "child" state to the full, almost unimaginably powerful "adult" stage. Interesting, with a twist at the end.
"Before I Wake" ("Before I Wake . . .," Famous Fantastic Mysteries, March 1945) -- Psychological fantasy in which a teenage boy, who has read about faraway places and imagines all sorts of fantasic things about them, is transported in his dreams. Includes a great deal of "local color" among Portugeuse fisherman on the Gulf of Mexico.
"Exit the Professor" (Thrilling Wonder Stories, October 1947) -- Wild farce in which a scientist discovers a family of hillibillies with amazing abilities. These are so outrageous (extreme long life, invisibility, flying, etc.) that this reads more like fantasy than science fiction.