Chapter

 1 I  | enough!” said Barbicane, in a serious voice; “let us prepare.
 2 II |      impossible.~The case was serious, the problem interesting,
 3 II |      my brain! It cannot be a serious one. For have we not been
 4 V  |    excess would bring us very serious physiological troubles.
 5 VI |  Barbicane and Nicholl always serious, Michel Ardan always enthusiastic.
 6 XII|      said the president, in a serious voice, “I do not know whither
 7 XII|       out one by one.”~“Do be serious,” said Barbicane.~“Well,
 8 XII|   Barbicane.~“Well, let us be serious,” replied Michel quietly; “
 9 XV |   exclaimed Michel Ardan in a serious tone, as if they had told
10 XV |     they had told him of some serious event. “What I particularly
11 XVI|    erring bodies might create serious perils for the travelers.