CONTENTS: ~ ~ ~ Mother of Invention [Tom Godwin]; Hide! Hide! Witch! [Mark Clifton & Alex Apostolides]; Counterspy [Kelley Edwards]; Ill Wind [Lee Correy]; ARTICLES: The Scientist [John W. Campbell, Jr.]; The Micropsychiatric Applications of Thiotimoline [Isaac Asimov]; The Mystery of the Blue Mist of Mars [R. S. Richardson]