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       For a time the possibilities of the motor-bicycle so occupied Bert's mind that he remained regardless of the new direction in which the striving soul of man was finding exercise and refreshment. He failed to observe that the type of motor-car, like the type of bicycle, was settling-down and losing its adventurous quality. Indeed, it is as true as it is remarkable that Tom was the first to observe the new development. But his gardening made him attentive to the heavens, and the proximity of the Bun Hill gas-works and the Crystal Palace, from which ascents were continually being made, and presently the descent of ballast upon his potatoes, conspired to bear in upon his unwilling mind the fact that the Goddess of Change was turning her disturbing attention to the sky. The first great boom in aeronautics was beginning.     

       Grubb and Bert heard of it in a music-hall, then it was driven home to their minds by the cinematograph, then Bert's imagination was stimulated by a sixpenny edition of that aeronautic classic, Mr. George Griffith's       “Clipper of the Clouds,” and so the thing really got hold of them.     

       At first the most obvious aspect was the multiplication of balloons. The sky of Bun Hill began to be infested by balloons. On Wednesday and Saturday afternoons particularly you could scarcely look skyward for a quarter of an hour without discovering a balloon somewhere. And then one bright day Bert, motoring toward Croydon, was arrested by the insurgence of a huge, bolster-shaped monster from the Crystal Palace grounds, and obliged to dismount and watch it. It was like a bolster with a broken nose, and below it, and comparatively small, was a stiff framework bearing a man and an engine with a screw that whizzed round in front and a sort of canvas rudder behind. The framework had an air of dragging the reluctant gas-cylinder after it like a brisk little terrier towing a shy gas-distended elephant into society. The combined monster certainly travelled and steered. It went overhead perhaps a thousand feet up (Bert heard the engine), sailed away southward, vanished over the hills, reappeared a little blue outline far off in the east, going now very fast before a gentle south-west gale, returned above the Crystal Palace towers, circled round them, chose a position for descent, and sank down out of sight.     

       Bert sighed deeply, and turned to 

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