This classic pulp magazine anthology opens with an editor's note outlining publication standards and proceeds into a series of imaginative works from the early twentieth century. In the leading story by Ralph Milne Farley, a young scientist descends into the Pacific in a bathysphere and encounters a subterranean civilization of man-handed sharks and sea-serpents. Other tales in the volume explore planetary mysteries, the survival of humanity after the death of the sun, and the miniature existence of a man trapped in a forest. The volume concludes with the beginning of a serial space adventure where heroes return to the dark moon.
Throughout the collection, authors of the period combine imaginative adventure with early scientific speculation, creating a distinct aesthetic of retro-futurism. The narrative threads balance technical jargon of the era with dramatic struggles against hostile environments. While the language reflects the conventions of its time, the central themes investigate the limits of human endurance and curiosity. The stories collectively establish the tone of early American pulp magazines without resolving into modern cynical deconstructions.