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TWO:Hurriedly the youthful Sky Patrol tumbled onto the sand, digging cotton plugs out of their ears now that the roar of the motor no longer made them essential.Another principle in planing machines which deserves notice is the manner of driving carriages or platens; this is usually performed by means of spur wheels and a rack. A rack movement is smooth enough, and effective enough so far as a mechanical connection between the driving gearing and a platen, but there is a difficulty met with from the torsion and elasticity of cross-shafts and a train of reducing gearing. In all other machines for metal cutting, it has been a studied object to have the supports for both the tools and the material as rigid as possible; but in the common type of planing machines, such as have rack and pinion movement, there is a controversion of this principle, inasmuch as a train of wheels and several cross-shafts constitute a very effective spring between the driving power and the point of cutting, a matter that is easily proved by planing across the teeth of a rack, or the threads of a screw, on a machine arranged with spur wheels and the ordinary reducing gearing. It is true the inertia of a platen is interposed and in a measure overcomes this elasticity, but in no degree that amounts to a remedy.

TWO:The dishonour was for the townsmen who, in an outbreak of insane fanaticism, drove the blameless truthseeker from his adopted home. Anaxagoras was the intimate companion of Pericles, and Pericles had made many enemies by his domestic as well as by his foreign policy. A coalition of harassed interests and offended prejudices was formed against him. A cry arose that religion and the constitution were in danger. The Athenians had too much good sense to dismiss their great democratic Minister, but they permitted the illustrious statesman��s political opponents to strike at him through his friends.29 Aspasia was saved only by the tears of her lover. Pheidias, the grandest, most spiritual-minded artist of all time, was arrested on a charge of impiety, and died in a prison of the city whose temples were adorned with the imperishable monuments of his religious inspiration. A decree against ��astronomers and atheists�� was so evidently aimed at Anaxagoras that the philosopher retired to Lampsacus, where he died at the age of seventy-two, universally admired and revered. Altars dedicated to Reason and Truth were erected in his honour, and for centuries his memory continued to be celebrated by an annual feast.30 His whole existence had been devoted to science. When asked what made life worth living, he answered, ��The contemplation of the heavens and of the universal cosmic order.�� The reply was like a title-page to his works. We can see that specialisation was38 beginning, that the positive sciences were separating themselves from general theories about Nature, and could be cultivated independently of them. A single individual might, indeed, combine philosophy of the most comprehensive kind with a detailed enquiry into some particular order of phenomena, but he could do this without bringing the two studies into any immediate connexion with each other. Such seems to have been the case with Anaxagoras. He was a professional astronomer and also the author of a modified atomic hypothesis. This, from its greater complexity, seems more likely to have been suggested by the purely quantitative conception of Leucippus than to have preceded it in the order of evolution. Democritus, and probably his teacher also, drew a very sharp distinction between what were afterwards called the primary and secondary qualities of matter. Extension and resistance alone had a real existence in Nature, while the attributes corresponding to our special sensations, such as temperature, taste, and colour, were only subjectively, or, as he expressed it, conventionally true. Anaxagoras affirmed no less strongly than his younger contemporaries that the sum of being can neither be increased nor diminished, that all things arise and perish by combination and division, and that bodies are formed out of indestructible elements; like the Atomists, again, he regarded these elementary substances as infinite in number and inconceivably minute; only he considered them as qualitatively distinct, and as resembling on an infinitesimal scale the highest compounds that they build up. Not only were gold, iron, and the other metals formed of homogeneous particles, but such substances as flesh, bone, and blood were, according to him, equally simple, equally decomposable, into molecules of like nature with themselves. Thus, as Aristotle well observes, he reversed the method of Empedocles, and taught that earth, air, fire, and water were really the most complex of all bodies, since they supplied39 nourishment to the living tissues, and therefore must contain within themselves the multitudinous variety of units by whose aggregation individualised organic substance is made up.31 Furthermore, our philosopher held that originally this intermixture had been still more thoroughgoing, all possible qualities being simultaneously present in the smallest particles of matter. The resulting state of chaotic confusion lasted until Nous, or Reason, came and segregated the heterogeneous elements by a process of continuous differentiation leading up to the present arrangement of things. Both Plato and Aristotle have commended Anaxagoras for introducing into speculation the conception of Reason as a cosmic world-ordering power; both have censured him for making so little use of his own great thought, for attributing almost everything to secondary, material, mechanical causes; for not everywhere applying the teleological method; in fact, for not anticipating the Bridgewater Treatises and proving that the world is constructed on a plan of perfect wisdom and goodness. Less fortunate than the Athenians, we cannot purchase the work of Anaxagoras on Nature at an orchestral book-stall for the moderate price of a drachma; but we know enough about its contents to correct the somewhat petulant and superficial criticism of a school perhaps less in sympathy than we are with its author��s method of research. Evidently the Clazomenian philosopher did not mean by Reason an ethical force, a power which makes for human happiness or virtue, nor yet a reflecting intelligence, a designer adapting means to ends. To all appearances the Nous was not a spirit in the sense which we attach, or which Aristotle attached to the term. It was, according to Anaxagoras, the subtlest and purest of all things, totally unmixed with other substances, and therefore able to control and bring them into order. This is not how men speak of an immaterial inextended consciousness. The truth is that no40 amount of physical science could create, although it might lead towards a spiritualistic philosophy. Spiritualism first arose from the sophistic negation of an external world, from the exclusive study of man, from the Socratic search after general definitions. Yet, if Nous originally meant intelligence, how could it lose this primary signification and become identified with a mere mode of matter? The answer is, that Anaxagoras, whose whole life was spent in tracing out the order of Nature, would instinctively think of his own intelligence as a discriminating, identifying faculty; would, consequently, conceive its objective counterpart under the form of a differentiating and integrating power. All preceding thinkers had represented their supreme being under material conditions, either as one element singly or as a sum total where elemental differences were merged. Anaxagoras differed from them chiefly by the very sharp distinction drawn between his informing principle and the rest of Nature. The absolute intermixture of qualities which he presupposes bears a very strong resemblance both to the Sphairos of Empedocles and to the fiery consummation of Heracleitus, it may even have been suggested by them. Only, what with them was the highest form of existence becomes with him the lowest; thought is asserting itself more and more, and interpreting the law of evolution in accordance with its own imperious demands.

TWO:Such an interpretation of instinct introduces us to a new principle��self-interest; and this was, in fact, recognised on all hands as the foundation of right conduct; it was about the question, What is our interest? that the ancient moralists were disagreed. The Cynics apparently held that, for every being, simple existence is the only good, and therefore with them virtue meant limiting oneself to the bare necessaries of life; while by following Nature they meant reducing existence to its lowest terms, and assimilating our actions, so far as possible, to those of the lower animals, plants, or even stones, all of which require no more than to maintain the integrity of their proper nature.The Alexandrian Sceptic��s general arguments against the possibility of knowledge resolve themselves into a criticism of what Sir W. Hamilton called Natural Realism, somewhat complicated and confused by a simultaneous attack on the theory of natural morality conceived as something eternal and immutable. They are summed up in the famous ten Tropes. Of these the first three are founded on the conflicting sensations produced by the same object when acting on different animals��as is inferred from the marked contrast presented by their several varieties of origin and structure,��on different men, and on the different senses of the same individual. The fourth, which has evidently an ethical bearing, enlarges on the changes in men��s views caused by mental and bodily changes, according to their health, age, disposition, and so forth. The next five Tropes relate to circumstances connected with the objects themselves: their distance and position as regards the spectator, the disturbance produced in their proper action by external influences such as air and light, together with the various membranes and humours composing the organs of sense through which they are apprehended; their quantitative variation, involving as it does opposite effects on the senses, or as with medicines, on the health; the law of relativity, according to which many things are only known when taken in company with others, such as double and half, right and left, whole and part; comparative frequency or rarity of occurrence, as with comets, which, while really of much less importance than the sun, excite much more interest from their being so seldom seen. Finally, the tenth Trope is purely ethical, and infers the non-existence of a fixed moral standard from the divergent and even opposite customs prevailing among different nations.297