The articles described fantastic animals on the Moon, including bison, goats, unicorns, bipedal tail-less beavers and bat-like winged humanoids ("Vespertilio-homo") who built temples. There were trees and oceans and beaches. These discoveries were supposedly made with "an immense telescope of an entirely new principle".
The author of the narrative was supposedly Dr. Andrew Grant, who described himself as the travelling companion of Sir John Herschel, but Dr Grant was fictitious.
The New York Sun published six articles and terminated them due the imaginary telescope being destroyed.