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 ily forcing the various electrical devices that Rob had relinquished into the pockets of his fiery jacket.

Finally he turned with an abrupt movement.

"Good-by!" he cried. "When mortal eyes next behold me they will be those of one fit to command my services! As for you, your days will be passed in obscurity and your name be unknown to fame. Good-by,—forever!"

The room filled with a flash of white light so like a sheet of lightning that the boy went reeling backwards, half stunned and blinded by its dazzling intensity.

When he recovered himself the Demon of Electricity had disappeared.

Rob's heart was very light as he left the workshop and made his way down the attic stairs.

"Some people might think I was a fool to give up those electrical inventions," he re-