four o'clock
`` And yet he is a man of science , people say , '' she muttered to herself . `` How did he ever manage to get married ? I 'll ask Madame when I dress her hair . '' At four o'clock , Professor Marmus was at the end of the Rue de Seine , under the arcades of the Institute . Those who know him will admit that he had done nobly , since he had taken only one hour to go through the Luxembourg and down the Rue de Seine . There a lamentable voice , the voice of a child , plucked from the good man the two sous that Madame Adolphe had given to him . When he reached the Pont des Arts he remembered that he had to pay toll and turned back suddenly to beg for a sou from the child .