96

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Classification of the Sci.
95

reaction of the solid bodies against which the wind blows and which must be propagated back in waves for long distances,—there is a motion of the feathers too rapid and also too slight to be discerned from the distant earth. Half a dozen men have at different times tried to soar with something like wings. All of them concerning whose attempts we have sufficient information succeeded at once with their very first trials in flying up into the wind. Their own difficulty was that the sudden tilting of their apparatus required a degree of skill in balancing it that they had not time to acquire before they were killed or maimed. But a large apparatus would turn over so slowly that a man would be able to induce the necessary movements in a leisurely manner; and both theory and the facts about birds show that flight like that of the soaring birds is easier the larger the flying machine is. There can therefore be no intelligent doubt that the first competant man who undertakes the prob-

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