Symmes's Theory of Concentric Spheres Demonstrating that the Earth is hollow, habitable within, and widely open about the poles

CHAPTER IX.

Chapter 968 wordsPublic domain

A few brief suggestions, relative to the description, tonnage, and number of vessels, necessary to be equipped for a voyage of discovery to the interior regions of the earth; the number of men necessary to be employed on board, articles necessary for the outfit, and the probable expense attending the same; also, as to the route most proper to be pursued to accomplish the object of the expedition.