"That was the great feature of Mr. Pullman's invention," was the reply. "He saw that few railroad companies would care to go to the expense of running cars which could only be used for sleeping purposes. He was familiar with the 'old-fashioned, stuffy cars, where men sat in stiff-backed seats and dozed and yawned and waited for morning. By putting people to sleep this wide-awake man made a fortune.' You are sitting on the bed now. But here comes the porter to make up the berths next to us. The lady wishes to put her little boy to sleep." With much interest Mr. Greenleaf watched the porter make a sleeping room out of a sitting room. In a trice the cushions in the seats and backs were twisted about and laid from seat to seat, making a bed. With a jump, the porter stood on the arm of the seat, and turned a knob in the roof. Down came another bed, a few feet above the first. From this was pulled a triangular board which was placed between the beds and the next seats. Sheets, blankets, and pillows, which had been shut up in the roof, were soon properly spread out, and two good beds were the result. Curtains were found above the upper bed, which, hung upon poles, shut the beds off from the car aisle. Behind these the mother undressed her child and put him to bed. Just at this moment a man went through the car crying "First call for dinner." Mr. Towne immediately jumped to his feet and said, "Let us go and get good seats." "You have forgotten your hat, Henry," said his uncle. "I don't need it. Come, hurry," said Henry. Perplexed, the old man followed his nephew through three cars to the dining car, where they were soon seated at a little table, in front of a large window, from which everything they passed could be seen. It is not necessary to describe the dining room, for it was merely a well-furnished restaurant. The men ordered what they desired, and settled back to wait until their dinner was brought on. "How is it, Henry, that we did not feel the wind as we passed from car to car? You hurried me so fast that I did not have time to notice." "Don't you see," said the drummer, "how attaching a dining car to a train required another change also? There used to be a rule of every railroad company forbidding the passengers to go from car to car while the train was in motion. When the company put on the 'diner,' it invited the people to break its own rule. So vestibule cars came next. Side doors are built on the car platforms and with these closed the regular car doors can be left open. Thus one can walk the entire length of the train, through sleeper, parlor car, dining car, smoking saloon, library, bath room, barber shop, and writing room, without once going out of doors. This is a modern vestibule train." One more interesting discussion took place the next morning as they were nearing New York City. "Tell me something about modern bridges," said Mr. Greenleaf. [Illustration: BROOKLYN BRIDGE.]