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THREE:Stated briefly, Zeller��s theory of ancient thought is that the Greeks originally lived in harmony with Nature; that the bond was broken by philosophy and particularly by the philosophy of Socrates; that the discord imperfectly overcome by Plato and Aristotle revealed itself once more in the unreconciled, self-concentrated subjectivity of the later schools; that this hopeless estrangement, after reaching its climax in the mysticism of the Neo-Platonists, led to the complete collapse of independent speculation; and that the creation of a new consciousness by the advent of Christianity and of the Germanic races was necessary in order to the successful resumption of scientific enquiry. Zeller was formerly a Hegelian, and it seems to me that he still retains far too much of the Hegelian formalism in his historical constructions. The well-worked antithesis between object and subject, even after being revised in a positivist sense, is totally inadequate to the burden laid on it by this theory; and if we want really to understand the causes which first hampered, then arrested, and finally paralysed Greek philosophy, we must seek for them in a more concrete order of considerations. Zeller, with perfect justice, attributes the failure of Plato and Aristotle to their defective observation of Nature and their habit of regarding the logical combinations of ideas derived from the common use of words as an adequate representative of the relations obtaining among things in themselves. But it seems an extremely strained and artificial explanation to say that their shortcomings in this respect were due to a confusion of the objective and the subjective, consequent on the imperfect separation of the Greek mind from Nature��a confusion, it isx added, which only the advent of a new religion and a new race could overcome.1 It is unfair to make Hellenism as a whole responsible for fallacies which might easily be paralleled in the works of modern metaphysicians; and the unfairness will become still more evident when we remember that, after enjoying the benefit of Christianity and Germanism for a thousand years, the modern world had still to take its first lessons in patience of observation, in accuracy of reasoning, and in sobriety of expression from such men as Thucydides and Hippocrates, Polybius, Archim��des and Hipparchus. Even had the Greeks as a nation been less keen to distinguish between illusion and reality than their successors up to the sixteenth century��a supposition notoriously the reverse of true��it would still have to be explained why Plato and Aristotle, with their prodigious intellects, went much further astray than their predecessors in the study of Nature. And this Zeller��s method does not explain at all.To construe the term "transmission of power" in its full sense, it will, when applied to machinery, include nearly all that has motion; for with the exception of the last movers, or where power passes off and is expended upon work that is performed, all machinery of whatever kind may be called machinery of transmission. Custom has, however, confined the use of the term to such devices as are employed to convey power from one place to another, without including organised machines through which power is directly applied to the performance of work. Power is transmitted by means of shafts, belts, friction wheels, gearing, and in some cases by water or air, as various conditions of the work to be performed may require. Sometimes such machinery is employed as the conditions do not require, because there is, perhaps, nothing of equal importance connected with mechanical engineering of which there exists a greater diversity of opinion, or in which there is a greater diversity of practice, than in devices for transmitting power.