London: Jarrolds Publishers Limited, 1925. Octavo, original decorated dark brown cloth, front and spine panels stamped in red. First edition. Interplanetary novel. "...blends interplanetary, lost world and future war themes-descendants of a moon colony established by 17th century Europeans attack the Earth with heat-rays" - Clute and Nicholls: The Encyclopedia of Science Fiction, p. 743. "Ingenious, literate, but somewhat clumsily handled." - Bleiler: Science-Fiction: The Early Years #1381.