The driver wrapped his ragged cloak around him. Resignedly, he was saying to himself, "I have seen many odd folks, but this one—" He heard the word "Institute."

"The Institute, Monsieur?" he asked.

"Yes, my friend, the Institute," replied Marmus.

"Well he wears the red ribbon," said the driver to himself. "Perhaps he has something to do with the Institute."

The professor, infinitely more comfortable in his cab than on the sidewalk, devoted himself entirely to solving the problem that went against his theory and would not surrender—the rascal! The cab stops at the Institute; the janitor sees the Academician and bows to him respectfully. The cab driver, his suspicions dispelled, talks with the janitor of the Institute while the illustrious professor goes—at eight in the evening—to the Academie des Sciences.

The cab driver tells the janitor where he found his fare.

"At the Iena bridge," repeats the janitor. "M. Marmus was coming back from Passy. He had dined, doubtless, with M. Planchette, one of his friends of the Academy."

"He couldn't tell me his address," says the cab driver.