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Rob regarded the brilliant apparition with a solemn face, but made no

answer.

No living person," continued the Demon, "has ever before been favored

with such comforting devices for the preservation and extension of

human life as yourself. You seem quite unappreciative, it is true; but

since our connection I have come to realize that you are but an ordinary

boy, with many boyish limitations; so I do not condemn your foolish

actions too harshly."

That is kind of you," said Rob.

To prove my friendliness," pursued the Demon, "I have brought, as the

first of to-day's offerings this Electro-Magnetic Restorer. You see it is

shaped like a thin metal band, and is to be worn upon the brow, clasping

at the back of the head. Its virtues surpass those of either the fabulous

'Fountain of Youth,' or the 'Elixir of Life,' so vainly sought for in past

ages. For its wearer will instantly become free from any bodily disease or

pain and will enjoy perfect health and vigor. In truth, so great are its

powers that even the dead may be restored to life, provided the blood has

not yet chilled. In presenting you with this appliance, I feel I am

bestowing upon you the greatest blessing and most longed-for boon ever

bequeathed of suffering humanity."

Here he held the slender, dull-colored metallic band toward the boy.

Keep it," said Rob.

The Demon started, and gave him an odd look.

What did you say?" he asked.

I told you to keep it," answered Rob. "I don't want it."

The Demon staggered back as if he had been struck.

Don't want it!" he gasped.

No; I've had enough of your infernal inventions!" cried the boy, with

sudden anger.

He unclasped the traveling machine from his wrist and laid it on the

table beside the Demon.

The Master Key