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TWO:In his criticism on the ideal theory, Aristotle argues that it is unproved; that the consequences to which it leads would be rejected by the idealists themselves; that it involves a needless addition to the sum of existence; that it neither explains the origin of things nor helps us to understand them, while taking away from them their substantial reality; that the Ideas are merely sensible objects hypostasised, like the anthropomorphic divinities of primitive men; that, to speak of them as patterns, in whose likeness the world was created, is a mere idle metaphor; that, even assuming the existence of such patterns, each individual must be made in the likeness, not of one, but of many ideas��a human being, for instance, must be modelled after the ideal biped and the ideal animal, as well as after the ideal man; while many of the ideas themselves, although all are supposed to exist absolutely, must be dependent on other and simpler types; finally, that, assuming an idea for every abstract relation, there must be ideas to represent the relation between every sensible object and its prototype, others for the new relations thus introduced, and so on to infinity.Those who will may see in all this an anticipation of chemical substitution and double decomposition. We can assure them that it will be by no means the most absurd parallel discovered between ancient and modern ideas. It is possible, however, to trace a more real connexion between the Aristotelian physics and mediaeval thought. We do not of361 course mean the scholastic philosophy, for there never was the slightest doubt as to its derivation; we allude to the alchemy and astrology which did duty for positive science during so many centuries, and even overlapped it down to the time of Newton, himself an ardent alchemist. The superstitions of astrology originated independently of the peripatetic system, and probably long before it, but they were likely to be encouraged by it instead of being repressed, as they would have been by a less anthropomorphic philosophy. Aristotle himself, as we have seen, limited the action of the heavens on the sublunary sphere to their heating power; but, by crediting them with an immortal reason and the pursuit of ends unknown to us, he opened a wide field for conjecture as to what those ends were, and how they could be ascertained. That the stars and planets were always thinking and acting, but never about our affairs, was not a notion likely to be permanently accepted. Neither was it easy to believe that their various configurations, movements, and names (the last probably revealed by themselves) were entirely without significance. From such considerations to the casting of horoscopes is not a far remove. The Aristotelian chemistry would still more readily lend itself to the purposes of alchemy. If Nature is one vast process of transmutation, then particular bodies, such as the metals, not only may, but must be convertible into one another. And even those who rejected Aristotle��s logic with scorn still clung to his natural philosophy when it flattered their hopes of gain. Bacon kept the theory of substantial forms. His originality consisted in looking for a method by which any form, or assemblage of forms might be superinduced at pleasure on the underlying matter. The real development of knowledge pursued a far different course. The great discoverers of the sixteenth and seventeenth centuries achieved their success by absolutely reversing the method of Aristotle, by bringing into fruitful contact principles which he had condemned to barren isolation.362 They carried terrestrial physics into the heavens; they brought down the absoluteness and eternity of celestial law to earth; they showed that Aristotle��s antithetical qualities were merely quantitative distinctions. These they resolved into modes of motion; and they also resolved all motions into one, which was both rectilinear and perpetual. But they and their successors put an end to all dreams of transmutation, when they showed by another synthesis that all matter, at least within the limits of our experience, has the changeless consistency once attributed exclusively to the stellar spheres.

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TWO:"Bore me!" Leona cried. "Never more interested in my life. Subtlety of this kind always appeals to me. Proceed."It is generally useless and injudicious to either expect or to search after radical changes or sweeping improvements in machine manufacture or machine application, but it is important in learning how to construct and apply machinery, that the means of foreseeing what is to come in future should at the same time be considered. The attention of a learner can, for example, be directed to the division of labour, improvements in shop system, how and where commercial interests are influenced by machinery, what countries are likely to develop manufactures, the influence of steam-hammers on forging, the more extended use of steel when cheapened by improved processes for producing it, the division of mechanical industry into special branches, what kind of machinery may become staple, such as shafts, pulleys, wheels, and so on. These things are mentioned at random, to indicate what is meant by looking into the future as well as at the present.

THREE:Nor was this all. As the world of sense was coming back into favour, the world of reason was falling into disrepute. Just as the old physical philosophy had been decomposed by the Sophisticism of Protagoras and Gorgias, so also the dialectic of Socrates was corrupted into the sophistry of Eubulides and Euthyd��mus. Plato himself discovered that by reasoning deductively from purely abstract premises, contradictory conclusions could be established with apparently323 equal force. It was difficult to see how a decision could be arrived at except by appealing to the testimony of sense. And a moral reform could hardly be effected except by similarly taking into account the existing beliefs and customs of mankind.It must further be noted that disbelief in a future life, as a philosophical principle, was not confined to the Epicureans. All philosophers except the Platonists and Pythagoreans were materialists; and no logical thinker who had once applied his mind to the subject could accept such an absurdity as the everlasting duration of a complex corporeal substance, whether consisting of gaseous or of fiery matter. A majority of the Stoics allowed the soul to continue its individual existence until, in common with the whole world, it should be reabsorbed into the elemental fire; but others looked forward to a more speedy extinction, without ceasing on that account to consider themselves orthodox members of the school. Of these the most remarkable instance is Marcus Aurelius. The great emperor was not blind to what seemed the enormous injustice of death, and did not quite see his way to reconciling it with the Stoic belief in a beneficent providence; but the difficulty of finding room for so many ghosts, and perhaps also the Heracleitean dogma of perpetual transformation, led him to renounce whatever hope he may at one time have cherished of entering on a new existence in some better world.359 A similar consequence was involved in the principles of the Peripatetic philosophy; and Alexander of Aphrodisias, the famous Aristotelian commentator, who flourished about 200 A.D., affirms the perishable nature of the soul on his own account, and, with perfect justice, attributes the same belief to Aristotle himself.360