The Doctor delivered his improvised lecture amid the rattle of boxes that were sliding down the sloping gangway from the side of the steamer, as the process of unloading began almost immediately on her arrival. The lecture was suddenly terminated by the inattention of the audience, the antics of a donkey in a portable stall having caught their eyes. The animal did not relish the rapid descent along the gangway, as his progress easily averaged a mile a minute, and the momentum acquired in the slide carried him far out upon the wharf. He reared and plunged as he was going downwards, and in his struggles one of the upper slats of his cage was torn off. But at this point he became discreet, and carried his protests no further than to lift up his voice in its loudest tones. [Illustration: THE WHARF AT ASPINWALL.] Threading their way through the mass of bales and boxes that covered the wharf, our friends were soon on solid earth at the end of the coral reef already mentioned. Here the tropical forest was visible in all its luxuriance, and not very far away, as the city does not cover a large area, and the trees grow luxuriantly wherever they are not kept down by the hand of man. Dr. Bronson explained to the youths that Aspinwall is built upon the island of Manzanillo, which is about three miles long by a mile in width; the harbor was formerly known as Navy Bay, and is said to have been discovered by Columbus on his third voyage. In spite of the commercial importance of the place, Aspinwall contains little to interest the ordinary sight-seer. "You observe," said the Doctor, "that everything is designed for use, and not for ornament; the buildings are of a practical character, and many of them are not even intended to be permanent. There are only a few hundred houses in the city, most of them of wood, and very loosely constructed. Some of the buildings of the railway company are of iron or brick, partly as a precaution against fire, and partly to secure immunity from tropical insects and the rapid deterioration of wood in the damp climate of the Isthmus. The canal company has followed the same plan in the construction of its shops and sheds, but as these structures will be of no further use when the canal is completed there is no attempt to make them ornamental. In the ordinary parlance of the tourist, Aspinwall can be 'done' in half an hour." Following the Doctor's suggestion, they strolled along the street of hotels and shops near the head of the wharf, passed in front of the stone church, the first Protestant edifice ever erected in New Granada, gave a hasty glance at the iron buildings of the Panama Railway, and then returned to the steamer for breakfast. After that meal was concluded they went on shore again, arranged for temporary quarters in one of the hotels, and immediately transferred their baggage to it.