Chapter

 1 VII  | would, necessarily, be very difficult, in view of the problem
 2 XIV  |    the balloon was becoming difficult, as they dared not rise
 3 XXIII|   him. His breathing became difficult, and he asked for air. The
 4 XXIII|        That would be rather difficult to do!” said Joe, with a
 5 XXXI | chart of Lake Tchad is very difficult to trace with exactitude,
 6 XXXV |    walking both painful and difficult. But at length he managed
 7 XLI  |    A Rival of Mohammed.—The Difficult Mountains.—Kennedy’s Weapons.—
 8 XLI  |   to pass, and that will be difficult to do, since I cannot augment
 9 XLI  |  which would have been very difficult to avoid during the night
10 XLI  |     I claim your help for a difficult piece of work.”~The Victoria,
11 XLII |  the pipes he found it more difficult to disengage them, because