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 Demon bowed and spread his hands in the form of a semi-circle. An instant later there was a blinding flash, and when Rob recovered from it and opened his eyes the Demon of Electricity had disappeared.