An excavating machine was in operation not far from the railway, and huge mounds of earth had been thrown up on either side of the line of the canal. Hundreds of laborers were at work, and the scene was, in many respects, a repetition of what they had encountered at Aspinwall, or, rather, at the new city which has risen near it. "This is an American machine," said their guide, as he pointed to the excavator, "and it will interest you to know that the excavators and dredges from New York have proved more satisfactory than those of French construction. They are very effective, and rarely get out of order; the French machines were admirably adapted to the Suez Canal, but the soil here is much harder than that at Suez, and requires a more powerful engine for its removal." From Gatun the party returned to the canal entrance, and thence to their hotel in Aspinwall. Later they dined with their new friends, and when they retired for the night they felt that they had crowded a good deal of sight-seeing into their first day on the Isthmus. [Illustration: A TROPICAL HARBOR.] CHAPTER III. OVER THE ISTHMUS.--A PROFITABLE RAILWAY.--ISTHMUS FEVER.--TROPICAL TREES, FLOWERS, AND ANIMALS.--SIGHTS IN PANAMA.--THE CATHEDRAL.--A STROLL ON THE BEACH.--THE PARADISE OF CONCHOLOGISTS. [Illustration: MAP OF THE PANAMA RAILWAY.] Next morning our friends arranged to leave for Panama by the regular train. Just as they were about starting from the hotel they were met by the manager of the railway, who invited them to occupy the directors' car, which was to be drawn by a special locomotive, and would follow the train an hour or more later. They accepted the invitation, sending their baggage by the train, with the assurance that it would be found at the station at Panama on their arrival. The directors' car afforded superior facilities for seeing the objects of interest along the route, and, besides, they were to be accompanied by the manager, and also by the official who had been of such practical assistance on the previous day. They were joined by some of the officials connected with the construction of the canal, and altogether the party was a most agreeable one. Dr. Bronson explained to the youths that when the canal company was organized it was deemed advisable to have command of the railway in order to facilitate the work. A controlling interest in the line was bought by the canal company, and it is fair to suppose that the owners of the shares received a good price for their property.