"Willingly, if it lies within my power to render such assistance."

"Thank you," said the other. "Are you ready to begin?"

"Quite ready," I said.

"Very well then," bade the voice. "Kindly stand back two feet from the mouthpiece and say coo-coo three times, with a rising inflection on the final coo."

The request appeared reasonable; accordingly I complied.

"Splendid," praised the unknown when I had concluded. "Now put your mouth close up to the transmitter and do the same thing all over again, but slightly louder."

No sooner requested than done.

"Now stand two feet to the left of the phone and repeat."

I repeated.

"Now two feet to the right, please."