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of this order of modern knights-errant, from hot-headed, ill-fated Pilatre de Rozier down to Gaston Tissandier, the man who still edits _La Nature_ in the lower strata of an ocean into the treacherous upper depths of which he has risen seven miles. Your true aeronaut is not an inventor of flying-machines, not much concerned about what is known as the "problem of aerial navigation." He is content to take the wings of the morning and be carried away to the uttermost parts of the earth. Problems he leaves to the scientists: he wooes the wilderness he cannot subdue. He is an explorer of unknown regions, a beauty-worshipper at a shrine whose pearly, sun-kissed portals open to him alone. People travel thousands of miles horizontally to rest their eyes on scenes infinitely less novel, beautiful and grand than one perpendicular mile of vantage would open to them, little matter whence taken. Having accepted the wind for his pilot, our argonaut seeks no improvement upon his aerial raft. Like the bow and arrow, it long ago reached perfection, and, though he may cherish some choice and secret recipe for varnish or be the inventor of an improved valve, he generally builds with a birdlike reliance on instinct and tradition. Gas-bag, netting, concentrating-ring, basket, valve, anchor, drag-rope and exploding cord,--what has the century of ballooning added to its essentials? how can coming centuries improve this perfection of simplicity? Aerial navigation is altogether another thing. A swallow does not rise by displacing a volume of air whose specific gravity is greater than its own, but by using the atmosphere as a fulcrum. Otherwise it must possess a bulk which its tiny wings would be powerless to impel against the opposing breeze. Mr. Grimley, the aeronaut, writing of some experiments he has recently been making at Montreal with an ingenious arrangement of revolving fans invented by two gentlemen of that city, says: "The Cowan and Paje propelling and steering apparatus worked as well as could be expected, but the air will never be navigated by balloons driven by machinery. It is opposed to common sense." Few fully appreciate the extreme mobility of the atmosphere or the intensity of the force which wind exerts on surfaces opposed to its action. A child with a palm-leaf fan can drive a balloon in equilibrium about at will in an atmosphere entirely quiet, while the same balloon, under the impulse of a lively gale, will tear itself l
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