as Graham noted these a remote and tiny figure of a man clad in pale blue arrested his attention. This little figure was far overhead across the space beside the higher fastening of one of these festoons, hanging forward from a little ledge of masonry and handling some well-nigh invisible strings dependent from the line. Then suddenly, with a swoop that sent Graham's heart into his mouth, this man had rushed down the curve and vanished through a round opening on the hither side of the way. Graham had been looking up as he came out upon the balcony, and the things he saw above and opposed to him had at first seized his attention to the exclusion of anything else. Then suddenly he discovered the roadway! It was not a roadway at all, as Graham understood such things, for in the nineteenth century the only roads and streets were beaten tracks of motionless earth, jostling rivulets of vehicles between narrow footways. But this roadway was three hundred feet across, and it moved; it moved, all save the middle, the lowest part. For a moment the motion dazzled his mind. Then he understood.
Under the balcony this extraordinary roadway ran swiftly to Graham's right, an endless flow rushing along as fast as a nineteenth-century express train, an endless platform of narrow transverse overlapping slats with little interspaces that permitted it to follow the curvatures of the street. Upon it were seats, and here and there little kiosks, but they swept by too swiftly for him to see what might be therein. From this nearest and swiftest platform a series of others descended to the centre of the space. Each moved to
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