Tumblr favorite #2332: Genius beasts would have a girl-making potion

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My original tumblr post was here. This image is a cover for em>Future, combined with Science Fiction for January 1951 and contains the text “The Genius Beasts, feature novel by James MacCreigh. Edwin James; Richard S. Shave [Shaver?]; Wallace West.” It was first posted on tumblr by Damsel Lover.