11. The Man of Science

Rob passed the remainder of the day wandering about London and amusing himself by watching the peculiar ways of the people. When it became so dark that there was no danger of his being observed, he rose through the air to the narrow slit in the church tower and lay upon the floor of the little room, with the bells hanging all around him, to pass the night.

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