"Paul asks that you will explain to him about the tower?"
Monsieur Roger remained a moment without understanding, then a light struck him, and he said,—
"Ah! Master Paul wants me to explain to him how I learned the height of the tower Heurtebize?"
"That is it," said Miette.
Paul Solange made an affirmative sign by a respectful movement of the head.
"But," said Monsieur Roger, responding to this sign, "it is physical science, my dear Master Paul,—physical science, you know; and, goodness, I was so much afraid of boring you that both I and Monsieur Dalize had resolved never to approach this subject."
"Still, sir," said Paul, "all that you have said and shown to us was on account of the tower of Heurtebize, and you promised me——"
"That is true," said Monsieur Dalize; "and if you promised, you must keep your word. So explain to Paul how you have been able, without moving, to learn the exact height of that famous tower."
"Come, then, I obey," answered Monsieur Roger.
And, addressing himself to Paul, he said,—