He replied, “Our opinion is this: The volcanic action in the moon toward its close and final cessation, was enormous. The planet had already been completely honeycombed by former convulsions and the seas had poured themselves into the underground openings, until there was almost as much water below the surface as above. This water kept up a continual contention with the melted interior, resulting in still greater explosions, sending out enormous quantities of volcanic matter, forming cones in some cases twenty-five miles high and over 100 miles in diameter. The enormous weight of these volcanic cones in many cases proved too great to be supported by the crust, that separated them from the interior cavities their materials had been blown out of, and so they broke through—that is the central part of the cones broke through, leaving a margin of their bases all around, standing like the walls of a crater. But these are not the original craters, as you can see. If they were, they would be on top of elevated cones of enormous height, which they are not.”

“This view appears to me very plausible and I feel the more interested in the subject, because the idea constantly impresses itself upon me, that the earth is repeating the history of the moon. According to our theories of evolution the two bodies separated from each other, when they were in the condition of hot expanded gases, and as the moon contained only 1/81 part as much matter as the earth, it cooled down and became a habitable world, many millions of years before the earth. Since you have been talking to me, the impression has constantly grown upon me, that your moon history is really an anticipation of our own, and it becomes the more interesting on that account.”

His eyes expressed extreme satisfaction, as he replied that he was glad that I had seen that point.

“We have in one of the provinces of the interior continent, an immense university, devoted to the study of mundane affairs, past, present and future. The duty is assigned me of holding a professorship in this university, in the college of ‘Mundane Prognostication’. As this college has been in operation for over 100,000 years, we have had abundant opportunity to verify our system of prognostication, and you would be surprised at the accuracy with which our predictions have been realized in your history. Of course, we could have done nothing, but for the basis our own history gave us to work on.”

“Well,” said I, “I can’t say that I am sorry to know that my time will be out long before the earth reaches the conditions that makes it necessary for the inhabitants to retreat underground. These spaces below must indeed be queer places to live in, for it don’t seem like they would be exposed to storms, as if out of doors, and yet not cosy and homelike, as if in a house, and I don’t see how they can be otherwise than cold damp and gloomy—that is, viewed from the stand point of earth. Am I right?”

“No,” he replied, “you are not. Those abodes, as we have them fixed up on the moon, you would regard as more delightful than anything you have on earth, and as equalling your dreams of paradise. There are as you suppose no storms and no extremes of temperature. There is always a very light breeze blowing, half the time in one direction, and half in the other. This is caused by the action of the sun on the external continent, as it progressively passes over it from east to west. There is always fog and cloud at all the entrances to the interior continent that prevent the radiation of heat and help preserve an even temperature within. All the inhabited chambers are made as bright as sunlight by immense and numerous electric lights, which are placed with reference to the best, effects both from a utilitarian and an artistic point of view. They are generally placed at great elevations, and are often arranged to imitate the constellations of the heavens, so that looking up, one may see a portion of the sky as he would see it from the external continent, and by traveling about among the various interior provinces, he can see the whole of it. In some of the chambers, the lights are made to represent the members of the solar system and each one is caused to make the movements properly, belonging to it, the whole constituting a planetarium on an immense scale—in some instances—several miles in diameter and three miles above the floor.”

“I can well imagine the glory of such scenery and such possibilities,” said I, “but I do not see by what mechanism you can accomplish such results.”

“You must remember,” he replied, “that we have resources, that your race does not possess. With you a great many things would be practically out of the question that with us are very easy. In the first place, we are a flying race as you see, and this means a great deal on the moon’s external continent, and still more in the internal continent, where on account of the attraction of the earth and the hump, our weight is much reduced without a corresponding reduction of strength. The fluttering and flying about of crowds overhead is one of the pleasing features of our life.

“In the second place, the power of neutralizing the gravity of metals, as I have explained to you, enables us to erect works miles above the ground more easily than you do at the surface. In fact the works erect themselves and the most we do is to tether them at the proper height to keep them from going too far. When motion is required to be given them, the globes of light are sometimes attached to a car that is made to run on a single rail elliptical track, which may be suspended at any elevation and reduced to a minimum weight by proper adjustments of its gravitation, the light globe being either suspended from the car or floating above it. The elliptical orbit is inclined enough to enable gravity to propel the car. An automatic shunt turns on repulsion when the car reaches the lowest part of the orbit and it is then forwarded on the up grade portion, shunted again at the top and so on perpetually. Another machine often used is a hollow cylindrical stem suspended from the dome, having a series of wheels, concentric with the cylinder, one above another and caused to revolve horizontally at different rates, by clockwork inside the cylinder. Globes of light are suspended by long wires to these wheels, which by their revolution, at varying rates, cause the globes by centrifugal motion to describe large or small orbits as desired. All sorts of eccentric and peculiar motions are imparted to the globes by variations in the regularity of the revolutions of the wheels, the spheres falling toward the center when the motion is slow and flying outward when it is fast. The mazes of a cotillion are often imitated, and the performance is called the ‘dancing of the spheres’. This is also accompanied by music, sometimes by local bands situated on the ground playing in concert with the movement, at other times by immense instruments operated by the same machinery that drives the spheres.

“It is not difficult for you to imagine the beauty and grandeur of some of these overhead scenes. Of course the power used is electricity, and it is used liberally and freely since its cost is merely nominal. Heat as well as light is supplied through the same means and used for all purposes, domestic, industrial and public. Our houses are very tasteful and often highly ornamental. The architecture is light and graceful and suited to a mild and quiet climate, for we have the pleasant air of your tropics without their storms or excessive heat. A slight sprinkle of rain is all we ever have in the shape of a storm in any part of the interior continent, and these sprinkles are rendered periodical by artificial means. There are no wide agricultural tracts with us, nor densely populated cities, but the population is distributed in towns, and continuous villages line the roads, each of which is devoted to some principal productive industry. There are principal streets that run miles, passing through and connecting these towns, and often bending so as to make a complete circuit. The streets are wide and we are always furnished with a number of rail tracks, and paved with a hard smooth material—sometimes stone and sometimes iron or alumina. The only vehicles used on the streets, besides the rail cars are light, private and pleasure carriages, propelled by storage batteries. The roads that unite the various internal provinces to each other and to the external continent, are chiefly the gravity roads, that I have already described to you. In some cases to save room, the roads are built in stories, one track above another. The work shops and farms, are situated conveniently near on streets parallel to the main thoroughfares, and their products are conveyed from them, and their materials to them, on roads laid on those streets.”