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axis, and is easily utilized, although your scientific men have as yet paid

little attention to it.

These forces, operating in all directions, absolute and immutable, are at

the disposal of mankind. They will carry you through the atmosphere

wherever and whenever you choose. That is, if you know how to control

them. Now, here is a machine I have myself perfected."

The Demon drew from his pocket something that resembled an open-

faced watch, having a narrow, flexible band attached to it.

When you wish to travel," said he, "attach this little machine to your left

wrist by means of the band. It is very light and will not be in your way.

On this dial are points marked 'up' and 'down' as well as a perfect

compass. When you desire to rise into the air set the indicator to the

word 'up,' using a finger of your right hand to turn it. When you have

risen as high as you wish, set the indicator to the point of the compass

you want to follow and you will be carried by the proper electric force in

that direction. To descend, set the indicator to the word 'down.' Do you

understand?"

Perfectly!" cried Rob, taking the machine from the Demon with

unfeigned delight. "This is really wonderful, and I'm awfully obliged to

you!"

Don't mention it," returned the Demon, dryly. "These three gifts you

may amuse yourself with for the next week. It seems hard to entrust

such great scientific discoveries to the discretion of a mere boy; but they

are quite harmless, so if you exercise proper care you can not get into

trouble through their possession. And who knows what benefits to

humanity may result? One week from to-day, at this hour, I will again

appear to you, at which time you shall receive the second series of

electrical gifts."

I'm not sure," said Rob, "that I shall be able again to make the

connections that will strike the Master Key."

Probably not," answered the Demon. "Could you accomplish that, you

might command my services forever. But, having once succeeded, you

are entitled to the nine gifts--three each week for three weeks--so you

have no need to call me to do my duty. I shall appear of my own accord."

Thank you," murmured the boy.

The Master Key