In the solution of it there is no exaggeration in saying that the Centennial stands more than a quarter of a century in advance of even the latest of its fellow expositions. At Vienna a river with a few small steamers below and a tow-path above represented water-carriage. Good railways came in from every quarter of the compass, but none of them brought the locomotive to the neighborhood of the grounds. In the matter of tram-roads for passengers the Viennese distinguished themselves over the Londoners and Parisians by the possession of _one_. In steam-roads they had no advantage and no inferiority. At each and all of these cities the packing-box and the passenger were both confronted by the vexatious interval between the station and the exposition building--often the most trying part of the trip. Horsepower was the one time-honored resource, in '73 as in '51, and in unnumbered years before. Under the ancient divisions of horse and foot the world and its _impedimenta_ moved upon Hyde Park, the Champ de Mars and the Prater, the umbrella and the oil-cloth tilt their only shield against Jupiter Pluvius, who seemed to take especial pleasure in demonstrating their failure, nineteen centuries after the contemptuous erasure of him from the calendar, to escape his power. It was reserved for the Philadelphia Commission to bring his reign (not the slightest intention of a pun) to a close. The most delicate silk or gem, and the most delicate wearer of the same, were enabled to pass under roof from San Francisco into the Main Building in Fairmount Park, and with a trifling break of twenty steps at the wharf might do so from the dock at Bremen, Havre or Liverpool. The hospitable shelter of the great pavilion was thus extended over the continent and either ocean. The drip of its eaves pattered into China, the Cape of Good Hope, Germany and Australia. Their spread became almost that of the welkin. Let us look somewhat more into the detail of this unique feature of the American fair.