Weight and gravity. Acting in all directions. Proving the law of universal gravitation. Drilling with the raft equipment. Grinding barley flour. Making sleeping mattresses. The bustle of final preparations. The good-by to their herd of yaks. The march to the falls. John discovers a log in the drift and a rope. The dense forest. Crossing the river to the south. Finding a camp fire with fresh bones. Numerous traces of inhabitants. A glowing fire. Following the trail. Trying to catch them before night. Efforts to capture one as a means of opening communication. Sighting the camp. Hurried consultation. Surrounding the camp of the natives.