eight in the evening
`` 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 .