Transcriber's Note: This etext was produced from Amazing Stories Fact and Science Fiction May 1962 and was first published in Amazing Stories March 1929. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed. Minor spelling and typographical errors have been corrected without note. A table of contents has been provided below: The Airlords Besieged The "Ground Ships" Threaten We "Sink" the "Ground Ships" Han Electrono-Ray Science American Ultronic Science An Unequal Duel Captured! Hypnotic Torture The Fall of Nu-Yok Life in Lo-Tan, the Magnificent The Forest Men Attack The Mysterious "Air Balls" Escape! The Destruction of Lo-Tan The Counter-Attack Victory The AIRLORDS of HAN By PHILIP FRANCIS NOWLAN Illustrated by FRANK R. PAUL Copyright, 1927, by E. P. Co., Inc.