Symmes's Theory of Concentric Spheres: Demonstrating that the Earth is Hollow, Habitable Within, and Widely Open about the Poles

John Cleves Symmes, Jr. (1779 – May 1829) was an American army officer whose 1818 Hollow Earth theory, expounded on the lecture circuit, gained him considerable notoriety. The Hollow Earth hypothesis proposes that the planet Earth is either entirely hollow or otherwise contains a substantial interior space. The scientific community has dismissed the notion since at least the late 18th century. The concept of a hollow Earth recurs many times in folklore and as the premise for subterranean fiction, a subgenre of adventure fiction. It is also featured in some present-day pseudoscientific and conspiracy theories.

This pre-1923 publication has been converted from its original format for the Kindle and may contain an occasional defect from the original publication or from the conversion.