Chapter 31 Departure in the Night-time.—All Three.—Kennedy's In-stincts.—Precautions.— The Course of the Shari River.—Lake Tchad.—The Water of the Lake.—The Hippopotamus.—One Bullet thrown away. About three o'clock in the morning, Joe, who was then on watch, at length saw the city move away from beneath his feet. The Victoria was once again in motion, and both the doctor and Kennedy awoke. The former consulted his compass, and saw, with satisfac-tion, that the wind was carrying them toward the north-northeast. "We are in luck!" said he; "every thing works in our favor: we shall discover Lake Tchad this very day." "Is it