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THREE:77 FORE:A pressure wheel, like a steam-engine, must include running contact between water-tight surfaces, and like a rotary steam-engine, this contact is between surfaces which move at different rates of speed in the same joint, so that the wear is unequal, and increases as the speed or the distance from the axis. When it is considered that the most careful workmanship has never produced rotary engines that would surmount these difficulties in working steam, it can hardly be expected they can be overcome in using water, which is not only liable to be filled with grit and sediment, but lacks the peculiar lubricating properties [41] of steam. A rotary steam-engine is in effect the same as a pressure water-wheel, and the apprentice in studying one will fully understand the principles of the other.In studying the growth of philosophy as an historical evolution, repetitions and anticipations must necessarily be of frequent occurrence. Ideas meet us at every step which can only be appreciated when we trace out their later developments, or only understood when we refer them back to earlier and half-forgotten modes of thought. The speculative tissue is woven out of filaments so delicate and so complicated that it is almost impossible to say where one begins and the other ends. Even conceptions which seem to have been transmitted without alteration are constantly acquiring a new value according to the connexions into which they enter or the circumstances to which they are applied. But if the method of evolution, with its two great principles of continuity and relativity, substitutes a maze of intricate lines, often returning on themselves, for the straight path along which progress was once supposed to move, we are more than compensated by the new sense of coherence and rationality where illusion and extravagance once seemed to reign supreme. It teaches us that the dreams of a great intellect may be better worth our attention than the waking perceptions of ordinary men. Combining fragments of the old order with rudimentary outlines of the new, they lay open the secret laboratory of spiritual chemistry, and help to bridge over the interval separating the most widely contrasted phases of life and thought. Moreover, when we have once accustomed ourselves to break up past systems of philosophy172 into their component elements, when we see how heterogeneous and ill-cemented were the parts of this and that proud edifice once offered as the only possible shelter against dangers threatening the very existence of civilisation��we shall be prepared for the application of a similar method to contemporary systems of equally ambitious pretensions; distinguishing that which is vital, fruitful, original, and progressive in their ideal synthesis from that which is of merely provisional and temporary value, when it is not the literary resuscitation of a dead past, visionary, retrograde, and mischievously wrong. And we shall also be reminded that the most precious ideas have only been shaped, preserved, and transmitted through association with earthy and perishable ingredients. The function of true criticism is, like Robert Browning��s Roman jeweller, to turn on them ��the proper fiery acid�� of purifying analysis which dissolves away the inferior metal and leaves behind the gold ring whereby thought and action are inseparably and fruitfully united.

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THREE:In returning to one of the older cosmologies, the Stoics placed themselves in opposition to the system of Aristotle as a whole, although on questions of detail they frequently adopted his conclusions. The object of Heracleitus, as against the Pythagoreans, had been to dissolve away every antithesis in a pervading unity of contradictories; and, as against the Eleatics, to substitute an eternal series of transformations for the changeless unity of absolute existence. The Stoics now applied the same method on a scale proportionate to the subsequent development of thought. Aristotle had carefully distinguished God from the world, even to the extent of isolating him from all share in its creation and interest in its affairs. The Stoics declared that God and the world were one. So far, it is allowable to call them pantheists. Yet their pantheism was very different from what we are accustomed to denote by that name; from the system of Spinoza, for example. Their strong faith in final causes and in Providence��a faith in which they closely followed Socrates��would be hardly consistent with anything but the ascription of a distinct and individual consciousness to the Supreme Being, which is just what modern pantheists refuse to admit. Their God was sometimes described as the soul of the world, the fiery element surrounding and penetrating every other kind of matter. What remained was the body of God; but it was a body which he had originally created out of his own substance, and would, in the fulness of time, absorb into that substance again.25 Thus they kept the future conflagration foretold by Heracleitus, but gave it a more religious colouring. The process of creation was then to begin over again, and all things were to run the same12 course as before down to the minutest particulars, human history repeating itself, and the same persons returning to live the same lives once more.26 Such a belief evidently involved the most rigid fatalism: and here again their doctrine offers a pointed contrast to that of Aristotle. The Stagirite, differing, as it would seem, in this respect from all the older physicists, maintained that there was an element of chance and spontaneity in the sublunary sphere; and without going very deeply into the mechanism of motives or the theory of moral responsibility, he had claimed a similar indeterminateness for the human will. Stoicism would hear of neither; with it, as with modern science, the chain of causation is unbroken from first to last, and extends to all phenomena alike. The old theological notion of an omnipotent divine will, or of a destiny superior even to that will, was at once confirmed and continued by the new theory of natural law; just as the predestination of the Reformers reappeared in the metaphysical rationalism of Spinoza.27 FORE:��Let��s go, then,�� urged Larry. ��Dick, look over the pontoons for strains, will you? She may have struck one of them��she has tipped over part way, maybe hit one of the pontoons.��