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THREE:An additional influence, not the less potent because unacknowledged, was the same craving for a principle of unity that had impelled early Greek thought to seek for the sole substance or cause of physical phenomena in some single material element, whether water, air, or fire; and just as these various principles were finally decomposed into the multitudinous atoms of Leucippus, so also, but much more speedily, did the general principle of knowledge tend to decompose itself into innumerable cognitions of the partial ends or utilities which action was directed to achieve. The need of a comprehensive generalisation again made itself felt, and all good was summed up under the head of happiness. The same difficulties recurred under another form. To define happiness proved not less difficult than to define use or practical knowledge. Three points of view offered themselves, and all three had been more or less anticipated by Socrates. Happiness might mean unmixed pleasure, or the exclusive cultivation of man��s higher nature, or voluntary subordination to a larger whole. The founder of Athenian philosophy used to present each of these, in turn, as an end, without recognising the possibility of a conflict between134 them; and it certainly would be a mistake to represent them as constantly opposed. Yet a truly scientific principle must either prove their identity, or make its choice among them, or discover something better. Plato seems to have taken up the three methods, one after the other, without coming to any very satisfactory conclusion. Aristotle identified the first two, but failed, or rather did not attempt to harmonise them with the third. Succeeding schools tried various combinations, laying more or less stress on different principles at different periods, till the will of an omnipotent Creator was substituted for every human standard. With the decline of dogmatic theology we have seen them all come to life again, and the old battle is still being fought out under our eyes. Speaking broadly, it may be said that the method which we have placed first on the list is more particularly represented in England, the second in France, and the last in Germany. Yet they refuse to be separated by any rigid line of demarcation, and each tends either to combine with or to pass into one or both of the rival theories. Modern utilitarianism, as constituted by John Stuart Mill, although avowedly based on the paramount value of pleasure, in admitting qualitative differences among enjoyments, and in subordinating individual to social good, introduces principles of action which are not, properly speaking, hedonistic. Neither is the idea of the whole by any means free from ambiguity. We have party, church, nation, order, progress, race, humanity, and the sum total of sensitive beings, all putting in their claims to figure as that entity. Where the pursuit of any single end gives rise to conflicting pretensions, a wise man will check them by reference to the other accredited standards, and will cherish a not unreasonable expectation that the evolution of life is tending to bring them all into ultimate agreement.With Nero��s visit to Greece in 66 the reaction begins. When, a few years later, the empire was disputed between a general from Gaul and a general from Syria, it was the candidate of the Eastern legions who prevailed; the revolt of Judaea drew attention to Eastern affairs; and the great campaigns of Trajan must have definitely turned the tide of public interest in that direction, notwithstanding the far-sighted protest of Tacitus. On more peaceful ground, Hadrian��s Asiatic tours and his protracted residence in Athens completed the work inaugurated by Nero. In his reign, the intellectual centre of gravity is definitely transferred to Greece; and Roman literature, after its last blaze of splendour under Trajan, becomes extinct, or survives only in forms borrowed from the sophistical rhetoric of the East.

THREE:First I will notice that among our many books upon mechanical subjects there are none that seem to be directed to the instruction of apprentice engineers; at least, there are none directed to that part of a mechanical education most difficult to acquire, a power of analysing and deducing conclusions from commonplace matters.

THREE:The reasons that favour combination of functions in machines, and the effects that such combinations may produce, are so various that the problem has led to a great diversity of opinions and practice among both those who construct and even those who employ machines. It may be said, too, that a great share of the combinations found in machines, such as those to turn [68], mill, bore, slot, and drill in iron fitting, are not due to any deliberate plan on the part of the makers, so much as to an opinion that such machines represent a double or increased capacity. So far has combination in machines been carried, that in one case that came under the writer's notice, a machine was arranged to perform nearly every operation required in finishing the parts of machinery; completely organised, and displaying a high order of mechanical ability in design and arrangement, but practically of no more value than a single machine tool, because but one operation at a time could be performed.CHAPTER IX. WIND-POWER.