We have already seen how this fundamental division is applied to the universe as a whole. But our philosopher is not content with classifying the phenomena as he finds360 them; he attempts to demonstrate the necessity of their dual existence; and in so doing is guilty of something very like a vicious circle. For, after proving from the terrestrial movements that there must be an eternal movement to keep them going, he now assumes the revolving aether, and argues that there must be a motionless solid centre for it to revolve round, although a geometrical axis would have served the purpose equally well. By a still more palpable fallacy, he proceeds to show that a body whose tendency is towards the centre, must, in the nature of things, be opposed by another body whose tendency is towards the circumference. In order to fill up the interval created by this opposition, two intermediate bodies are required, and thus we get the four elementsearth, water, air, and fire. These, again, are resolved into the antithetical couples, dry and wet, hot and cold, the possible combinations of which, by twos, give us the four elements once more. Earth is dry and cold, water cold and wet, air wet and hot, fire hot and dry; each adjacent pair having a quality in common, and each element being characterized by the excess of a particular quality; earth is especially dry, water cold, air wet, and fire hot. The common centre of each antithesis is what Aristotle calls the First Matter, the mere abstract unformed possibility of existence. This matter always combines two qualities, and has the power of oscillating from one quality to another, but it cannot, as a rule, simultaneously exchange both for their opposites. Earth may pass into water, exchanging dry for wet, but not so readily into air, which would necessitate a double exchange at the same moment.
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The prevailing custom of casting machine frames in one piece, or in as few pieces as possible, leads to a great deal of bar-boring, most of which can be performed accurately enough by boring bars supported in and fed through bearings. By setting up temporary bearings to support boring-bars, and improvising means of driving and feeding, most of the boring on machine frames can be performed on floors or sole plates and independent of boring machines and lathes. There are but few cases in which the importance of studying the principles of tool action is more clearly demonstrated than in this matter of boring; even long practical experience seldom leads to a thorough understanding of the [139] various problems which it involves.Zeller finds several good qualities in Alexanderprecocious statesmanship, zeal for the extension of Hellenic civilisation, long-continued self-restraint under almost irresistible temptation, and through all his subsequent aberrations a nobility, a moral purity, a humanity, and a culture, which raise him above every other great conqueror; and these he attributes, in no small degree, to the fostering care of Aristotle;176 yet, with the exception of moral purity, which was probably an affair of temperament, and has been remarked to an equal extent in other men of the same general character, he was surpassed, in all these respects, by Julius Caesar; while the ruthless vindictiveness, which was his worst passion, exhibited itself at the very beginning of his reign by the destruction of Thebes. A varnish of literary culture he undoubtedly had, and for this Aristotle may be thanked; but any ordinary sophist would probably have effected as much. As to the Hellenising of Western Asia, this, according to Grote, was the work, not of Alexander, but of the Diadochi after him.To follow the same chain of reasoning still farther, and to show what may be gained by method and system in learning mechanics, it may be assumed that machine functions consist in the application of power, and therefore power should be first studied; of this there can be but one opinion. The learner who sets out to master even the elementary principles of mechanics without first having formed a true conception of power as an element, is in a measure wasting his time and squandering his efforts."The burgomaster informs the population that any utterance contrary to the regulations will be severely punished.After the revolution which destroyed the political power of the old aristocracy, there came a further revolution the effect of which was to diminish largely its social predominance. We learn from the bitter sarcasms of Horace and Juvenal that under the empire wealth took the place of birth, if not, as those satirists pretend, of merit, as a passport to distinction and respect. Merely to possess a certain amount of money procured admission to the equestrian and senatorial orders; while a smaller pecuniary qualification entitled any Roman citizen to rank among the Honestiores as opposed to the Humiliores, the latter only being liable, if found guilty of certain offences, to the more atrocious forms of capital punishment, such as death by the wild beasts or by fire.314 Even a reputation for learning was supposed to be a marketable commodity; and when supreme power was held by a philoso207pher, the vulgar rich could still hope to attract his favourable notice by filling their houses with books.315 We also know from Juvenal, what indeed the analogy of modern times would readily suggest, that large fortunes were often rapidly made, and made by the cultivation of very sordid arts. Thus members of the most ignorant and superstitious classes were constantly rising to positions where they could set the tone of public opinion, or at least help to determine its direction.
