"Yes," responded Battell, "I can very easily formulate such a theory. I can assume that the earth was at one time a revolving ring of meteors, or minute planetary bodies, which by the mutual attraction of its parts became solid. This ring, besides the motion on its own axis, was revolving around the sun, or common center of the solar nebula, through space filled with meteors, and by its attraction it gathered other rings of meteors exterior to itself, thus forming a series of concentric rings revolving around the first, or present ring. The materials composing these external rings could not reach the parent ring at its equator because of the centrifugal force generated by its revolution around its axis, but under the operation of well-known mechanical laws, they might be drawn toward the pole where the attraction was the greatest and the centrifugal force the least. Under the influence of these contending forces, these external rings, thus acted upon, would one by one spread out and form, first a canopy over the central ring, and then it would part at the equator, and be drawn to the poles where it would ultimately find a resting place upon its polar edges. Such a process kept up long enough would convert the original revolving ring, or infant earth, into a hollow shell. Of course all this is mere speculation, but the same thing may be said of the nebular hypothesis, the supposed igneous condition of the earth's center, and in fact of nearly all the teachings of science when it attempts to go beyond the domain of undisputed facts." "I am much interested in your reasoning," I said. "This is a new thought to me and I would like to follow it a little further. How does this Hollow Globe theory account for volcanoes and other evidences of internal heat, that have led scientists to the conclusion that the center of the earth is an igneous mass?"