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 over the other above the cornices of the gateways. This is strictly analogous to their crossing a street. Their channels are kept separate, so that the five water-courses rise considerably more than 20 feet above the crown of the gateway arch. If we confine ourselves to the gate of San Lorenzo, we find that the lowest begins immediately above this, occupying the cornice; the second is behind the pediment; and the three superior ones are masked by a lofty marble superstructure, or attic, covered with inscriptions of several emperors, giving most important information on the subject of the Roman waters. Indeed, according to Fabretti, some antiquarians have maintained that the triumphal arch of Drusus, erected by Augustus, is in reality a disguise for an aqueduct passing over.

In the same way, no doubt, Roman emperors would have treated railways as they did aqueducts, had they existed, and must have penetrated into the heart of their city. They would have compelled them, whenever they came out into public view, to harmonise with the architecture which they were promoting, contribute to the embellishment of Rome, in their estimation the most beautiful of human creations— "Rerum pulcherrima Roma," and to become even monumental.

Why should not this be done in London, more wealthy far than was the Rome of the Cæsars? I believe that an iron viaduct is to cross, if it has not