But the discoveries that flowed from this were still more important. By further experimentation they found another type of radiant energy that behaved in a similar way towards gravitation. In a vacuum formed within a vessel of an alloy of irelium it ceased to obey the force of gravity; but as soon as it had passed through the side of the vessel, it gave full heed to the force. Within a few months after this had been discovered, there had been invented a faleena that fell or rose according as the new rays were intercepted by a film of the irelium-alloy or were allowed free passage _in vacuo_. The energy in mass drove the car on indifferent to the earth’s influence, or at the will of the guide brought the erfaleena, as they called it, gently sloping downwards at any angle required to the surface of the globe. A pioneering book at once developed the results of this discovery and invention. It showed how a way was now opened to other stars. For this new radiant energy was found to stream in and past the earth’s atmosphere in vast currents. The denser the medium, the more was it absorbed and lost, so that in the earth and the atmosphere it seldom or never manifested itself. Hence the long ages of scientific investigation before it was discovered. By means of these currents, which evidently set through space in definite directions, they would be able to guide their new anti-gravitation faleena to any point in the interstellar ether, and be able to keep up the supply of force that would drive it. And when they approached a new world they could by means of their new machinery bring its force of gravitation to bear on the car and so hasten its flight; and they would be able to hover over the atmosphere by means of the alternating movements of their engine, till they could find out its conditions, and see whether it would be safe to land on it or not. What they wanted yet was the evolution of their physical system in the direction of living in ether or in various atmospheres indifferently. It pointed out to the physiological families the way that would lead in this direction; and it showed how, though it would take countless ages, it was yet within the scope of their humanity.