When Paul had safely reached the ground, Monsieur Roger said to himself, with an air of satisfaction,—
"Come, come! we will make something out of that boy yet!"
[CHAPTER X.]
PHYSICAL SCIENCE.
Paul returned to the tower more quickly than Monsieur Roger had expected. Instead of returning to the château, he had taken the shortest cut, had reached the village, and had procured there the two things wanted. He climbed up the tower and arrived beside Monsieur Roger, holding out the ball of twine and the yard-stick.
"You are going to see, you little doubter, that I was not wrong," said Monsieur Roger.
He tied a stone to the twine, and let it down outside the tower to the ground.
"This length of twine," he said, "represents exactly the height of the tower, does it not?"