CONTENTS: ~ ~ NOVELETTES: Roofs of Silver [Gordon R. Dickson]; Senhor Zumbeira's Leg [Felix Marti-Ibañez]; SHORT STORIES: The Notary and the Conspiracy [Henri Damonti]; Ad Infinitum [Sasha Gilien]; Behind the Stumps [Russell Kirk]; The Depths [Jim Harmon]; ARTICLES: On Binary Digits and Human Habits [Frederik Pohl]; One, Ten, Buckle My Shoe [Isaac Asimov]