THREE: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 walked away from the kosatsu they saw a group engaged in the childish amusement of blowing soap-bubbles. There were three persons in the group, a man and two boys, and the youngsters were as happy as American or English boys would have been under similar circumstances. While the man blew the bubbles, the boys danced around him and endeavored to catch the shining globes. Fred and Frank were much interested in the spectacle, and had it not been for their sense of dignity, and the manifest impropriety of interfering, they would have joined in the sport. The players were poorly clad, and evidently did not belong to the wealthier class; but they were as happy as though they had been princes; in fact, it is very doubtful if princes could have had a quarter as much enjoyment from the chase of soap-bubbles.