"Of course, we do not know how long the effects of regenerating rays will make it possible to live," pursued Almos, "but in theory, it would seem that by their daily use perfect health will be assured, and life itself will continue indefinitely."

"And death become unknown on Mars!" I added, enthusiastically.

"Not quite unknown," rejoined Almos. "For lives are sometimes lost in accidents. Instant death defies all our science, and will not be conquered. But in accidents, no matter how serious, where a spark of life remains, we can prevent that from escaping until the body is in a condition to take care of it.

"This is accomplished by a device known as a virator, which, though simple in construction, is the greatest marvel of the age. It consists of a dome, made of material similar to glass in appearance, but which differs from anything else known, in that it is absolutely atomless. This dome fits over the operating table, upon which the patient lies, with just sufficient room for two persons inside, and is kept at the temperature of the body. On its top is a small globe made of the same material, measuring but a few inches in diameter, which is connected with the large chamber below by a neck or passage about an inch wide. The patient is placed inside, and there operated upon. If life leaves the body, either during the operation or after, the spirit ascends through the narrow passage into the small globe above and is there retained, as it cannot pass through the material of which the walls of this chamber are constructed. The body is then kept continually bathed in the regenerating rays, which not only preserve it as if life were in it, but actually carry on the process of healing. This continues until the body is in a perfectly sound and healthy condition again, and well able to retain life.

"And now occurs the most wonderful of all. When everything is in readiness for the spirit to enter the body again, a strong flow of super-radium is sent through the top globe from an instrument attached. Passing through the small chamber and down the narrow passage, it reaches the body, and immediately changes to a return flow. This current is but momentary; the patient is seen to move, and the body is once more quickened by the life spark. The flow of super-radium has conveyed the spirit of the patient from the small chamber above and released it in the body as it returned, in exactly the same manner as it does with light-waves or sound-waves."

"Marvelous!" I gasped, though my mind could only slowly comprehend this almost miraculous achievement. With such vast scientific resources nothing seemed impossible to Martians.

Almos had stopped abruptly. A change came over him. His face paled and his lips set in a hard, determined expression. Instantly I felt my every faculty strain to the utmost, in response to the new character of this remarkable being.

Speaking slowly and deliberately, his keen eyes holding mine fascinated by a strange fire that seemed kindled within them, he said:

"A few words more and we have reached that point at which death may await the inhabitant of Earth who would proceed farther. A death that no scientific knowledge can avert. I have tried to school your mind, to the end that you may fully understand the nature of a desperate undertaking, never before attempted by any human being, which, if you wish to attempt, you must risk alone.

"Impelled by a motive that I cannot now explain, I have spanned the millions of miles of universe lying between us by a bridge of theories, which, should they prove realities, would enable you to see and live in another world. Should they prove untenable, however, no power on Earth or Mars can save you; in five hours all would be over. You must consider the possible consequences ere it be too late."