ONE:On passing to terrestrial physics, we find that Aristotle is, as usual, the dupe of superficial appearances, against which other thinkers were on their guard. Seeing that fire always moved up, he assumed that it did so by virtue of a natural tendency towards the circumference of the universe, as opposed to earth, which always moved towards the centre. The atomists erroneously held that all matter gravitated downwards through infinite space, but correctly explained the ascent of heated particles by the pressure of surrounding matter, in accordance, most probably, with the analogy of floating bodies.200 Chemistry as a science is, of course, an entirely modern creation, but the first approach to it was made by Democritus, while no ancient philosopher stood farther from its essential principles than Aristotle. He analyses bodies, not into their material elements, but into the sensuous qualities, hot and cold, wet and dry, between which he supposes the underlying substance to be perpetually oscillating; a theory which, if it were true, would make any fixed laws of nature impossible.
FORE:With so powerful a protector, Alexander might safely bid his enemies defiance. The governor of Bithynia had to entreat Lucian, whose life had been threatened by the impostor, to keep out of harms way. Should anything happen to you, he said, I could not afford to offend Rutilianus by bringing his father-in-law to justice. Even the best and wisest man then living yielded to the prevalent delusion. Marcus Aurelius, who was at that time fighting with the Marcomanni, was induced to act on an oracle from Abonuteichus, promising that if two lions were thrown into the Danube a great victory would be the result. The animals made their way safely to the opposite bank; but were beaten to death with clubs by the barbarians, who mistook them for some outlandish kind of wolf or dog; and the imperial army was shortly afterwards defeated with a loss of 20,000 men.346 Alexander helped himself out of the difficulty with the stale excuse that he had only foretold a victory, without saying which side should win. He was not more successful in determining the duration of his own life, which came to an end before he had completed seventy years, instead of lasting, as he had prophesied, for a hundred and fifty. This miscalculation, however, seems not to have impaired his reputation, for even after his death it was believed that a statue of him in the market-place of Parium in Mysia had the power of giving oracles.347
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FORE:(1.) What limits the speed at which the reciprocating parts of machines may act?(2.) What is the nature of reciprocal motion produced by cranks?(3.) Can reciprocating movement be uniform in such [108] machines as power-hammers, saws, or pumps?(4.) What effect as to the rate of movement is produced by the elastic connections of a trip-hammer?
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FORE:It was natural that one who ranged with such consummate mastery over the whole world of apparent reality, should believe in no other reality; that for him truth should only319 mean the systematisation of sense and language, of opinion, and of thought. The visible order of nature was present to his imagination in such precise determination and fulness of detail that it resisted any attempt he might have made to conceive it under a different form. Each of his conclusions was supported by analogies from every other department of enquiry, because he carried the peculiar limitations of his thinking faculty with him wherever he turned, and unconsciously accommodated every subject to the framework which they imposed. The clearness of his ideas necessitated the use of sharply-drawn distinctions, which prevented the free play of generalisation and fruitful interchange of principles between the different sciences. And we shall have occasion to show hereafter, that, when he attempted to combine rival theories, it was done by placing them in juxtaposition rather than by mutual interpenetration. Again, with his vivid perceptions, it was impossible for him to believe in the justification of any method claiming to supersede, or even to supplement, their authority. Hence he was hardly less opposed to the atomism of Democritus than to the scepticism of Protagoras or the idealism of Plato. Hence, also, his dislike for all explanations which assumed that there were hidden processes at work below the surface of things, even taking surface in its most literal sense. Thus, in discussing the question why the sea is salt, he will not accept the theory that rivers dissolve out the salt from the strata through which they pass, and carry it down to the sea, because river-water tastes fresh; and propounds in its stead the utterly false hypothesis of a dry saline evaporation from the earths surface, which he supposes to be swept seawards by the wind.205 Even in his own especial province of natural history the same tendency leads him astray. He asserts that the spider throws off its web from the surface of its body like a skin, instead of evolving it from within, as Democritus had taught.206 The same thinker had320 endeavoured to prove by analogical reasoning that the invertebrate animals must have viscera, and that only their extreme minuteness prevents us from perceiving them; a view which his successor will not admit.207 In fact, wherever the line between the visible and the invisible is crossed, Aristotles powers are suddenly paralysed, as if by enchantment.341
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FORE:"I think I'll go down to Holloway and see Ren Lalage," Prout said thoughtfully. "I dare say I shall be able to advise him to tell me something as to the past of the Countess. If only he were not secure, that woman would have to look to herself. He believes that the woman betrayed and murdered his brother, and he is a Corsican. Give him a few hours' start, and the law would be rid of Leona Lalage."
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