Bert sighed deeply, and turned to his motor-bicycle again. And that was only the beginning of a succession of strange phenomena in the heavens--cylinders, cones, pear-shaped monsters, even at last a thing of aluminium that glittered wonderfully, and that Grubb, through some confusion of ideas about armour plates, was inclined to consider a war machine. There followed actual flight. This, however, was not an affair that was visible from Bun Hill; it was something that occurred in private grounds or other enclosed places and, under favourable conditions, and it was brought home to Grubb and Bert Smallways only by means of the magazine page of the half-penny newspapers or by cinematograph records. But it was brought home very insistently, and in those days if, ever one heard a man saying in a public place in a loud, reassuring, confident tone, “It's bound to come,” the chances were ten to one he was talking of flying. And Bert got a box lid and wrote out in correct window-ticket style, and Grubb put in the window this inscription, “Aeroplanes made and repaired.” It quite upset Tom--it seemed taking one's shop so lightly; but most of the neighbours, and all the sporting ones, approved of it as being very good indeed. Everybody talked of flying, everybody repeated over and over again, “Bound to come,” and then you know it didn't come. There was a hitch. They flew--that was all right; they flew in machines heavier than air. But they smashed. Sometimes they smashed the engine, sometimes they smashed the aeronaut, usually they smashed both. Machines that made flights of three or four miles and came down safely, went up the next time to headlong disaster. There seemed no possible trusting to them. The breeze upset them, the eddies near the ground upset them, a passing thought in the mind of the aeronaut upset them. Also they upset--simply. “It's this 'stability' does 'em,” said Grubb, repeating his newspaper. “They pitch and they pitch, till they pitch themselves to pieces.” Experiments fell away after two expectant years of this sort of success, the public and then the newspapers tired of the expensive photographic reproductions, the optimistic reports, the perpetual sequence of triumph and disaster and silence. Flying slumped, even ballooning fell away to some extent, though it remained a fairly popular sport, and continued to lift gravel from the wharf of the Bun Hill gas-works and drop it upon deserving people's lawns and gardens. There were half a dozen reassuring years for Tom--at least so far as flying was concerned. But that was the great time of mono-rail development, and his anxiety was only diverted from the high heavens by the most urgent threats and symptoms of change in the lower sky.