Thus we continued an undefined period in mind conversation; and of the information gained in my experience of that delightful condition, I have the privilege now to record but a small portion, and even this statement of facts appears, as I glance backward into my human existence, as if it may seem to others to border on the incredible. During all that time--I know not how long the period may have been--we were alternately passing and repassing through the partition of division (the sphere of gravity) that separated the inner from the outer substantial crust of earth. With each vibration our line of travel became shorter and shorter, like the decreasing oscillations of a pendulum, and at last I could no longer perceive the rushing motion of a medium like the air. Finally my guide said that we were at perfect rest at a point in that mysterious medial sphere which, at a distance of about seven hundred miles below the level of the sea, concentrates in its encompassing curvature, the mighty power of gravitation. We were fixed seven hundred miles from the outer surface of the globe, but more than three thousand from the center. CHAPTER L. MY WEIGHT ANNIHILATED.--"TELL ME," I CRIED IN ALARM, "IS THIS TO BE A LIVING TOMB?" "If you will reflect upon the condition we are now in, you will perceive that it must be one of unusual scientific interest. If you imagine a body at rest, in an intangible medium, and not in contact with a gas or any substance capable of creating friction, that body by the prevailing theory of matter and motion, unless disturbed by an impulse from without, would remain forever at absolute rest. We now occupy such a position. In whatever direction we may now be situated, it seems to us that we are upright. We are absolutely without weight, and in a perfectly frictionless medium. Should an inanimate body begin to revolve here, it would continue that motion forever. If our equilibrium should now be disturbed, and we should begin to move in a direction coinciding with the plane in which we are at rest, we would continue moving with the same rapidity in that direction until our course was arrested by some opposing object. We are not subject to attraction of matter, for at this place gravitation robs matter of its gravity, and has no influence on extraneous substances. We are now in the center of gravitation, the 'Sphere of Rest.'"