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THREE:Now that he wastes his native land with war,Thus, then, the Socratic dialogue has a double aspect. It is, like all philosophy, a perpetual carrying of life into ideas and of ideas into life. Life is raised to a higher level by thought; thought, when brought into contact with life, gains movement and growth, assimilative and reproductive power. If action is to be harmonised, we must regulate it by universal principles; if our principles are to be efficacious, they must be adopted; if they are to be adopted, we must demonstrate them to the satisfaction of our contemporaries. Language, consisting as143 it does almost entirely of abstract terms, furnishes the materials out of which alone such an ideal union can be framed. But men do not always use the same words, least of all if they are abstract words, in the same sense, and therefore a preliminary agreement must be arrived at in this respect; a fact which Socrates was the first to recognise. Aristotle tells us that he introduced the custom of constructing general definitions into philosophy. The need of accurate verbal explanations is more felt in the discussion of ethical problems than anywhere else, if we take ethics in the only sense that Socrates would have accepted, as covering the whole field of mental activity. It is true that definitions are also employed in the mathematical and physical sciences, but there they are accompanied by illustrations borrowed from sensible experience, and would be unintelligible without them. Hence it has been possible for those branches of knowledge to make enormous progress, while the elementary notions on which they rest have not yet been satisfactorily analysed. The case is entirely altered when mental dispositions have to be taken into account. Here, abstract terms play much the same part as sensible intuitions elsewhere in steadying our conceptions, but without possessing the same invariable value; the experiences from which those conceptions are derived being exceedingly complex, and, what is more, exceedingly liable to disturbance from unforeseen circumstances. Thus, by neglecting a series of minute changes the same name may come to denote groups of phenomena not agreeing in the qualities which alone it originally connoted. More than one example of such a gradual metamorphosis has already presented itself in the course of our investigation, and others will occur in the sequel. Where distinctions of right and wrong are involved, it is of enormous practical importance that a definite meaning should be attached to words, and that they should not be allowed, at least without express agreement, to depart from the recognised acceptation: for such words, connoting as they do the approval or disap144proval of mankind, exercise a powerful influence on conduct, so that their misapplication may lead to disastrous consequences. Where government by written law prevails the importance of defining ethical terms immediately becomes obvious, for, otherwise, personal rule would be restored under the disguise of judicial interpretation. Roman jurisprudence was the first attempt on a great scale to introduce a rigorous system of definitions into legislation. We have seen, in the preceding chapter, how it tended to put the conclusions of Greek naturalistic philosophy into practical shape. We now see how, on the formal side, its determinations are connected with the principles of Socrates. And we shall not undervalue this obligation if we bear in mind that the accurate wording of legal enactments is not less important than the essential justice of their contents. Similarly, the development of Catholic theology required that its fundamental conceptions should be progressively defined. This alone preserved the intellectual character of Catholicism in ages of ignorance and superstition, and helped to keep alive the reason by which superstition was eventually overthrown. Mommsen has called theology the bastard child of Religion and Science. It is something that, in the absence of the robuster parent, its features should be recalled and its tradition maintained even by an illegitimate offspring.

THREE: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.

THREE:It would be inferred that the arrangement of these double acting hammers must necessarily be complicated and expensive, but the contrary is the fact. The rams are simply two masses of iron mounted on wheels that run on ways, like a truck, and the impact of the hammers, so far as not absorbed in the work, is [114] neutralised by each other. No shock or jar is communicated to framing or foundations as in the case of single acting hammers that have fixed anvils. The same rule applies in the back stroke of the hammers as the links which move them are connected together at the centre, where the power is applied at right angles to the line of the hammer movement. The links connecting the two hammers constitute, in effect, a toggle joint, the steam piston being attached where they meet in the centre.The combination of several functions in one machine, although it may not seem an important matter to be considered here, is nevertheless one that has much to do with the manufacture of machines, and constitutes what may be termed a principle of construction.