Chapter 42 A Struggle of Generosity.—The Last Sacrifice.—The Dil-ating Apparatus. —Joe's Adroitness .—Midnight.—The Doctor's Watch.—Kennedy's Watch. —The Latter falls asleep at his Post.—The Fire.—The Howlings of the Nat-ives.—Out of Range. Doctor Ferguson's first care was to take his bearings by stel-lar observation, and he discovered that he was scarcely twenty-five miles from Senegal. "All that we can manage to do, my friends," said he, after having pointed his map, "is to cross the river; but, as there is neither bridge nor boat, we must, at all hazards, cross it with the balloon, and, in order to do that, we must