One of those scholastic books anthologies, as far as I recall, and some pretty nice scores in here that influenced a life of science fiction reading.
Even a minor story like the Rotifers is interesting to a boy with a microscope.
StarStreak : Who Goes There? [as by Don A. Stuart] - John W. Campbell Jr.
StarStreak : Collecting Team [Catch Em All Alive!] - Robert Silverberg
StarStreak : The Haunted Spacesuit [Who's There?] - Arthur C. Clarke
StarStreak : Condition of Employment - Clifford D. Simak
StarStreak : After the Sirens - Hugh Hood
StarStreak : The Spaceman Cometh - Henry Gregor Felsen
StarStreak : The Nine Billion Names of God
StarStreak : The Rotifers - Robert Abernathy
StarStreak : Does a Bee Care? - Isaac Asimov
4 out of 5