Doctor Bronson listened to the appeal of the boys, and when they were through he took a toothpick from his pocket and settled back in his chair in the parlor of the hotel. "Your request is very natural and proper," he answered; "but there are several things to consider. Niagara has been described many times, and those who have never seen it can easily know about it from books and other accounts. Consequently what you would write about the Falls would be a repetition of much that has been written before, and even your personal impressions and experiences would not be far different from those of others. I advise you not to attempt anything of the kind, and, at all events, not to stop here a day for that purpose. Spend the evening in writing brief letters home, but do not undertake a description of the Falls. If you want to stay a day in order to see more, we will stay, but otherwise we will go on." The boys readily accepted Doctor Bronson's suggestion. They wrote short letters, and Frank did not forget Miss Effie. Then they went out to see the Falls by moonlight, and in good season they went to bed, where they slept admirably. The next day the journey was resumed, and they had a farewell view of Niagara from the windows of the car as they crossed the Suspension Bridge from the American to the Canadian side. On they went over the Great Western Railway of Canada, and then over the Michigan Central; and on the morning after leaving Niagara they rolled into Chicago. Here they spent a day in visiting the interesting places in the Lake City. An old friend of Doctor Bronson came to see him at the Tremont House, and took the party out for a drive. Under the guidance of this hospitable citizen, they were taken to see the City-hall, the stock-yards, the tunnel under the river, the grain-elevators, and other things with which every one who spends a short time in Chicago is sure to be made familiar. They were shown the traces of the great fire of 1870, and were shown, too, what progress had been made in rebuilding the city and removing the signs of the calamity. Before they finished their tour, they had absorbed much of the enthusiasm of their guide, and were ready to pronounce Chicago the most remarkable city of the present time. As they were studying the map to lay out their route westward, the boys noticed that the lines of the railways radiated in all directions from Chicago, like the diverging cords of a spider's web. Everywhere they stretched out except over the surface of Lake Michigan, where railway building has thus far been impossible. The Doctor explained that Chicago was one of the most important railway centres in the United States, and owed much of its prosperity to the network they saw on the map. "I have a question," said Frank, suddenly brightening up. "Well, what is it?" "Why is that network we have just been looking at like a crow calling to his mates?" "Give it up; let's have it." "Because it makes Chi-ca-go."