Vol. 15, No. 5. Cover by Schelling for "Raindrop" by Hal Clement. Includes "Way Station" by Irving E. Cox, Jr.; "Guesting Time" by R. A. Lafferty; "Sign of the Wolf" by Fred Saberhagen; "Strong Current" by David Goodale "The Altar at Asconel" (serial, part 2 of 2) by John Brunner. FEATURE: When is a Robot? [editorial essay] by Frederik Pohl. Illustrated by Giunta, Nodel, and Morrow.