Book,  chapter

1    1,   12|     and on reaching the end, a wall of porphyry rose perpendicularly
2    2,   15|     when a placard against the wall arrested his attention.~
3    3,   12| foundation of the posts in the wall of the hut which abutted
4    3,   12|      united to dig through the wall—John with his dagger, the
5    3,   12|      passage into its exterior wall. What could be the object?
6    3,   12|        to descend the vertical wall to the slope below, and
7    3,   12|        where the perpendicular wall met the top of the slope.