Book,  Chapter

 1        I,  IV |     some serious accident had happened. Consequently, even before
 2        I,  VII|    steamer. Once, however, he happened to pass the engine-room.
 3        I,  VII|     dark, though it sometimes happened that, when the steamer’s
 4        I,  X  |     one night, if no accident happened. Unfortunately, thunder
 5        I,  XI |       But may I know what has happened which, though a misfortune
 6        I,  XI | nothing worthy of note having happened in the descent.~The first
 7        I,  XII|     the Siberian roads.~So it happened that Blount and Alcide had
 8        I,  XII|  intended to stop, if nothing happened to make them alter their
 9       II,  VI |      but surely. It sometimes happened that during the night, Nicholas,
10       II,  IX |       who had sworn, whatever happened, to accomplish his object.