life exist upon a planet which one school of scientific thought claimed to have a surface temperature of two hundred and sixty degrees below zero and which another school was equally positive was still in a half molten condition and so hot that gases rose as hot vapor into its thick, warm atmosphere to fall as incessant rain? How could human life exist in an atmosphere made up largely of ammonia and methane gases? And what of the effect of the planet's terrific gravitational pull? Would my legs be able to support my weight? If I fell down, would I be able to rise again?

Another question which presented itself to my mind, related to the motive power which had been carrying us through space at terrific speeds for seventeen days. I asked U Dan if he knew.

"They utilize the Eighth Barsoomian Ray, what we know as the ray of propulsion, in combination with the highly concentrated gravitational forces of all celestial bodies within the range of whose attraction the ship passes, and a concentration of Ray L (cosmic rays) which are collected from space and discharged at high velocities from propulsion tubes at the ship's stern. The eighth Barsoomian Ray helps to give the ship initial velocity upon leaving a planet and as a brake to its terrific speed when approaching its landing upon another. Gravitational forces are utilized both to accelerate speed and to guide the ship. The secret of their success with these inter-planetary ships lies in the ingenious methods they have developed for concentrating these various forces and directing their tremendous energies."

"Thanks, U Dan," I said, "I think I grasp the general idea. It would certainly surprise some of my scientific friends on earth."

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