“Near the Giant Cataract” said that rude scrawl penciled by poor Casson, when the attention of his captors was momentarily diverted. Bomba had no clear idea as to how far away that was or what direction would have to be followed to reach it. But from what he had gathered from the natives from time to time, the place was at a great distance, and he knew that a long and arduous journey lay before him.