Rouletabille went back to the door and carefully examined the lock and the bolt, satisfying himself that the door had certainly been burst open from the outside, and, further, that the key had been found in the lock on the inside of the chamber. He finally satisfied himself that with the key in the lock, the door could not possibly be opened from without with another key. Having made sure of all these details, he let fall these words: “That ’s better!”—Then sitting down on the ground, he hastily took off his boots and, in his socks, went into the room.

The first thing he did was to examine minutely the overturned furniture. We watched him in silence.

“Young fellow, you are giving yourself a great deal of trouble,” said Daddy Jacques ironically.

Rouletabille raised his head and said:—

“You have spoken the simple truth, Daddy Jacques; your mistress did not have her hair in bands that evening. I was a donkey to have believed she did.”

Then, with the suppleness of a serpent, he slipped under the bed. Presently we heard him ask:—

“At what time, Monsieur Jacques, did Monsieur and Mademoiselle Stangerson arrive at the laboratory?”

“At six o’clock.”

The voice of Rouletabille continued:

“Yes,—he’s been under here,—that’s certain; in fact, there was no where else where he could have hidden himself. Here, too, are the marks of his hobnails. When you entered—all four of you—did you look under the bed?”