“If he does it—” the shorter one muttered.

“He will do it!” the other answered.

He was back again before their eyes were weary of watching. Peter Ruff, from behind the boulder, closed his watch. Thirty-two miles in less than half an hour! The youth leaned from his seat.

“Is it enough?” he asked, hoarsely.

“It is enough!” the two men answered together. “We will come down.”

The youth touched a lever and the machine glided down towards the valley, falling all the while with the effortless grace a parachute. The shed from which his machine had issued was midway down a slope, with a short length of rails which ran, apparently, through it. The machine seemed to hover for several moments above the building, then descended slowly on to the rails and disappeared in the shed. The two men were already half-way down the hill. Peter Ruff rose from behind the boulder, stretched himself with a sense of immense relief, and lit a pipe. As yet he dared not descend. He simply changed his hiding place for a spot which enabled him to command a view of the handful of cottages at the back of the hill. He had plenty to think about. It was a wonderful thing—this—which he had seen!

The youth, meanwhile, was drinking deep of the poisonous cup. He walked between the two men—his cheeks were flushed, his eyes on fire.

“If all the world to-day had seen what we have seen,” the older man was saying, “there would be no more talk of Wilbur Wrights or Farmans. Those men are babies, playing with their toys.”

“Mine is the ideal principle,” the youth declared. “No one else has thought of it, no one else has made use of it. Yet all the time I am afraid—it is so simple.”

“Sell quick, then,” the fair-headed man advised. “By to-morrow night I can promise you fifty thousand pounds.”