Standing on the dock with several other round-bodied Lunites was Kwan Tsu Khan, his face bandaged and one arm in a sling. With him there also stood another, slender of figure, whom the professor instantly recognized. “Dr. Wu!” he exclaimed in surprise. “How did you get here?” “I had the honor of being your fellow passenger, professor,” replied the Chinaman, bowing slightly. “Come! Over the railing, worm!” grated Lin Ching, with another prod of his sword. The professor quickly vaulted the railing, alighting on the dock. “You will feed the Am-Er-I-Khan, Lin Ching,” commanded Kwan Tsu Khan, after the latter had followed his prisoner over the railing. “I will send for him later.” Then he turned and walked away, chatting amiably with Dr. Wu, while the other Lunites followed at a respectful distance behind. The savant was conducted off the docks, which were lighted by globes suspended from the arched ends of gracefully constructed lamp posts. He could not determine the nature of the light, which was yellow in color, and seemed to come from a liquid with which the globes were filled. Far above him, he caught glimpses of the rugged top of the great arched cavern in which the lunar city was situated, particularly at points where white stalactites reflected the light from the globes below. After leaving the docks, he threaded many narrow and crooked streets. The houses, which were set closely together, were mostly octagonal or cylindrical in shape, and the popular fashion in doors and windows seemed to be the diamond shape—one hinge only at the left corner of the diamond, and one catch at the right. The roofs were sharply pointed, and were either of yellow metal or heavy stone. He wondered why roofs should be needed at all in an underground city, and especially roofs of such heavy construction, until he saw a fragment of a stalactite fall on one of the metal roofs and glance off, alighting in the street not far from a group of round-bodied Lunites. The lighting system in the city was the same as at the docks—endless rows of suspended globes containing a substance which radiated yellow light. Presently the professor and his captor emerged from the narrow streets and entered a broad open park, or plaza, planted with luminous trees and shrubs of variegated forms and hues. Standing in the center of this park was a huge building, octagonal in shape, and crowned with a narrower, pagoda-like structure, the point of which reached nearly to the pendant stalactites on the arched vault above. The lower part of the building was of red stone, but the upper part was of burnished yellow metal surrounded by rings of yellow globes and reflecting their light with such brilliance as to light up a considerable portion of the city as well as the upper reaches of the cavern.