.

He was just falling asleep when a tremendous din and clatter nearly
deafened him, and set the whole tower trembling. It was the midnight
chime.

Rob clutched his ears tightly, and when the vibrations had died away
descended by the ladder to a lower platform. But even here the next
hourly chime made his ears ring, and he kept descending from platform
to platform until the last half of a restless night was passed in the
little room at the bottom of the tower.

When, at daylight, the boy sat up and rubbed his eyes, he said,
wearily: "Churches are all right as churches; but as hotels they are
rank failures. I ought to have bunked in with my friend, King Edward."

He climbed up the stairs and the ladders again and looked out the
little window in the belfry. Then he examined his map of Europe.

"I believe I'll take a run over to Paris," he thought. "I must be home
again by Saturday, to meet the Demon, so I'll have to make every day
count."

Without waiting for breakfast, since he had eaten a tablet the evening
before, he crept through the window and mounted into the fresh morning
air until the great city with its broad waterway lay spread out beneath
him. Then he sped away to the southeast and, crossing the channel,
passed between Amiens and Rouen and reached Paris before ten o'clock.

Near the outskirts of the city appeared a high tower, upon the flat
roof of which a man was engaged in adjusting a telescope. Upon seeing
Rob, who was passing at no great distance from this tower, the man
cried out:

"APPROCHEZ!--VENEZ ICI!"

Then he waved his hands frantically in the air, and fairly danced with
excitement. So the boy laughed and dropped down to the roof where,
standing beside the Frenchman, whose eyes were actually protruding from
their sockets, he asked, coolly:

"Well, what do you want?"

The other was for a moment speechless. He was a tall, lean man, having
a bald head but a thick, iron-gray beard, and his black eyes sparkled
brightly from behind a pair of gold-rimmed spectacles. After
attentively regarding the boy for a time he said, in broken English:

"But, M'sieur, how can you fly wizout ze--ze machine? I have
experiment myself wiz some air-ship; but you--zere is nossing to make
go!"

Rob guessed that here was his opportunity to do the Demon a favor by
explaining his electrical devices to this new acquaintance, who was
evidently a man of science.

"Here is the secret, Professor," he said