"There is a good story of how the natives of the country around Gatun had their first view of a locomotive. The track was completed to that point, and a day was set for running an engine over it. People came for long distances; they had heard wonderful stories of the witchcraft of the strangers, and there was great curiosity to know about it. There was an immense crowd, and at the appointed time the locomotive came in sight, puffing vigorously, and emitting clouds of steam and smoke. There was great excitement, which reached the pitch of terror when the creature came into the midst of the crowd, and the whistle was blown. The whole crowd fled to the river, and many of them jumped in, expecting they would be pursued, and possibly devoured. [Illustration: NATIVE IDEA OF THE LOCOMOTIVE.] "Finding the monster did not follow them, they gathered courage and reassembled, but stood at a safe distance, ready to run again if necessary. They sent forward their priest to examine the animal; he surveyed it carefully, and then informed his followers that it was not an animal, but a machine, in which there was a veritable demon chained, and compelled to work the crank which propelled it. The explanation was sufficient; the good priest knew it was hopeless to attempt to enlighten them on the uses of steam, and found the demon story the shortest way out of the difficulty. It is just possible, though, that he was not versed in natural philosophy, and his explanation may have been the honest result of his observation." At several points, as they passed along, Fred observed men cutting away the bushes by the roadside, and, in reply to a question, he learned that the growth of the tropical forest was so rapid that men were kept busy all along the route in keeping it down, so that it would not touch the passing trains. "But it is not without its advantages," said their informant; "what it costs to keep down the rapid vegetation is more than compensated by the interlacing of the roots through the road-bed so that it makes a powerful resistance to the water which rushes down the slopes after the heavy rains. Many a serious injury to the road has been prevented by this mass of roots." Their attention was called to flowers that grew in the forest, and the eyes of the youths were constantly occupied with the varieties of trees and plants that they passed in their ride. There were palms and mangroves, canes, ferns, orchids, and creeping, climbing, and hanging plants almost without number. There was hardly a tree without a parasite, and many trees were covered from the base to the topmost limb with foliage that was not their own. In some cases the trees were actually killed by the parasites that clung to them, and reminded our friends of the picture of a deer strangled by a serpent. [Illustration: THE ESPIRITU SANTO FLOWER.]