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THREE:Machinery of transmission being generally a part of the fixed plant of an establishment, experiments cannot be made to institute comparisons, as in the case of machines; besides, there are special or local considerations��such as noise, danger, freezing, and distance��to be taken into account, which prevent any rules of general application. Yet in every case it may be assumed that some particular plan of transmitting power is better than any other, and that plan can best be determined by studying, first, the principles of different kinds of mechanism and its adaptation to the special conditions that exist; and secondly, precedents or examples.The distinctive features of Epicureanism have, in truth, never been copied, nor are they ever likely to be copied, by any modern system. It arose, as we have seen, from a combination of circumstances which will hardly be repeated in the future history of thought. As the heat and pressure of molten granite turn sandstone into slate, so also the mighty systems of Plato and Aristotle, coming into contact with the irreligious, sensual, empirical, and sceptical side of Attic thought, forced it to assume that sort of laminated texture which characterises the theoretical philosophy of Epicurus. And, at the very same moment, the disappearance of all patriotism and public spirit from Athenian life allowed the older elements of Athenian character, its amiable egoism, its love of frugal gratifications, its aversion from purely speculative interests, to create a new and looser bond of social union among those who were indifferent to the vulgar objects of ambition, but whom the austerer doctrines of Stoicism had failed to attract.