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FORE:Before entering on the chain of reasoning which led Aristotle to postulate the existence of a personal First Cause, we must explain the difference between his scientific standpoint, and that which is now accepted by all educated minds. To him the eternity not only of Matter, but also of what he called Form,��that is to say, the collection of attributes giving definiteness to natural aggregates, more especially those known as organic species��was an axiomatic certainty. Every type, capable of self-propagation, that could exist at all, had existed, and would continue to exist for ever. For this, no explanation beyond the generative power of Nature was required. But when he had to account for the machinery by which the perpetual alternation of birth and death below, and the changeless revolutions of the celestial spheres above the moon were preserved, difficulties arose. He had reduced every other change to transport through space; and with regard to this his conceptions were entirely mistaken. He believed that moving matter tended to stop unless it was sustained by some external force; and whatever their advantages over him in other respects, we cannot say that the Atomists were in a position to correct him here: for their349 theory, that every particle of matter gravitated downward through infinite space, was quite incompatible with the latest astronomical discoveries. Aristotle triumphantly showed that the tendency of heavy bodies was not to move indefinitely downwards in parallel lines, but to move in converging lines to the centre of the earth, which he, in common with most Greek astronomers, supposed to be also the centre of the universe; and seeing light bodies move up, he credited them with an equal and opposite tendency to the circumference of the universe, which, like Parmenides and Plato, he believed to be of finite extent. Thus each kind of matter has its appropriate place, motion to which ends in rest, while motion away from it, being constrained, cannot last. Accordingly, the constant periodicity of terrestrial phenomena necessitates as constant a transformation of dry and wet, and of hot and cold bodies into one another. This is explained with perfect accuracy by the diurnal and annual revolutions of the sun. Here, however, we are introduced to a new kind of motion, which, instead of being rectilinear and finite, is circular and eternal. To account for it, Aristotle assumes a fifth element entirely different in character from the four terrestrial elements. Unlike them, it is absolutely simple, and has a correspondingly simple mode of motion, which, as our philosopher erroneously supposes, can be no other than circular rotation.(1.) Why has the lifting of weights been made a standard for the measure of power?��(2.) Name some of the difficulties to contend with in the operation of machinery for lifting or handling material.��(3.) What analogy exists between manual handling and the operation of hydraulic cranes?��(4.) Explain how the employment of overhead cranes saves room in a fitting shop.��(5.) Under what circumstances is it expedient to move material vertically?��(6.) To what circumstances is the danger of handling mainly attributable?

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FORE:Philosophy was no sooner domiciled at Athens than its professors came in for their full share of the scurrilous personalities which seem to have formed the staple of conversation in that enlightened capital. Aristotle, himself a trenchant and sometimes a bitterly scornful controversialist, did not escape; and some of the censures passed on him were, rightly or wrongly, attributed to Plato. The Stagirite, who had been brought up at or near the Macedonian Court, and had inherited considerable means, was, if report speaks truly, somewhat foppish in his dress, and luxurious, if not dissipated in his habits. It would not be surprising if one who was left his own master at so early an age had at first exceeded the limits of that moderation which he afterwards inculcated as the golden rule of morals; but the charge of extravagance was such a stock accusation at Athens, where the continued influence of country life seems to have bred a prejudice in favour283 of parsimony, that it may be taken almost as an exoneration from graver imputations; and, perhaps, an admonition from Plato, if any was needed, sufficed to check his disciple��s ambition for figuring as a man of fashion.In the mouth of a broad channel they touched water and ran out of momentum with the wings hovering over the grassy bank to either side.

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FORE:It seems difficult to reconcile views about marriage involving a recognition of the fact that mental and moral qualities are hereditarily transmitted, with the belief in metempsychosis elsewhere professed by Plato. But perhaps his adhesion to the latter doctrine is not to be taken very seriously. In imitation of the objective world, whose essential truth is half hidden and half disclosed by its phenomenal manifestations, he loves to present his speculative teaching under a mythical disguise; and so he may have chosen the old doctrine of transmigration as an apt expression for the unity and continuity of life. And, at worst, he would not be guilty of any greater inconsistency than is chargeable to those modern philosophers who, while they admit that mental qualities are inherited, hold each individual soul to be a separate and independent creation.

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