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TWO:The principal business of reason is, as we have seen, to376 form abstract ideas or concepts of things. But before the time of Aristotle it had already been discovered that concepts, or rather the terms expressing them, were capable of being united in propositions which might be either true or false, and whose truth might be a matter either of certainty or of simple opinion. Now, in modern psychology, down to the most recent times, it has always been assumed that, just as there is an intellectual faculty or operation called abstraction corresponding to the terms of which a proposition is composed, so also there is a faculty or operation called judgment corresponding to the entire proposition. Sometimes, again, the third operation, which consists in linking propositions together to form syllogisms, is assigned to a distinct faculty called reason; sometimes all three are regarded as ascending steps in a single fundamental process. Neither Plato nor Aristotle, however, had thought out the subject so scientifically. To both the framing, or rather the discovery, of concepts was by far the most important business of a philosopher, judgment and reasoning being merely subsidiary to it. Hence, while in one part of their logic they were realists and conceptualists, in other parts they were nominalists. Abstract names and the definitions unfolding their connotation corresponded to actual entities in Nature��the eternal Ideas of the one and the substantial forms of the other��as well as to mental representations about whose existence they were agreed, while ascribing to them a different origin. But they did not in like manner treat propositions as the expression of natural laws without, or of judgments within, the mind; while reasoning they regarded much more as an art of thinking, a method for the discovery of ideas, than as the Systematisation of a process spontaneously performed by every human being without knowing it; and, even as such, their tendency is to connect it with the theory of definition rather than with the theory of synthetic propositions. Some approach to a realistic view is, indeed, made by both. The377 restless and penetrating thought of Plato had, probably towards the close of his career, led him to enquire into the mutual relations of those Ideas which he had at first been inclined to regard as absolutely distinct. He shows us in the Sophist how the most abstract notions, such as Being, Identity, and so forth, must, to a certain extent, partake of each other��s nature; and when their relationship does not lie on the surface, he seeks to establish it by the interposition of a third idea obviously connected with both. In the later books of the Republic he also points to a scheme for arranging his Ideas according to a fixed hierarchy resembling the concatenation of mathematical proofs, by ascending and descending whose successive gradations the mind is to become familiarised with absolute truth; and we shall presently see how Aristotle, following in the same track, sought for a counterpart to his syllogistic method in the objective order of things. Nevertheless, with him, as well as with his master, science was not what it is with us, a study of laws, a perpetually growing body of truth, but a process of definition and classification, a systematisation of what had already been perceived and thought.Considered mechanically as a means of handling material, the human hands are capable of exerting force in any direction, vertically, horizontally, or at any angle, moving at various rates of speed, as the conditions may require, and with varying force within the limits of human strength. These functions enable us to pick up or lay down a weight slowly and carefully, to transport it at a rapid rate to save time, to move it in any direction, and without the least waste of power, except in the case of carrying small loads, when the whole body has to be moved, as in ascending or descending stairs. The power travelling cranes, that are usually employed in machine-fitting establishments, are perhaps the nearest approach that has been made to the human frame in the way of handling mechanism; they, however, lack that very important feature of a movement, the speed of which is graduated at will. It is evident that in machinery of any kind for handling and lifting that moves at a uniform rate of speed, and this rate of speed adapted, as it must be, to the conditions of starting or depositing a load, much time must be lost in the transit, especially when the load is moved for a considerable distance. This uniform speed is perhaps the greatest defect in the lifting machinery in common use, at least in such as is driven by power.

TWO:Epicurus was born 341 B.C., about the same time as Zeno the Stoic. Unlike all the other philosophers of his age, he was of Athenian parentage; that is to say, he belonged to a race of exclusively practical tendencies, and marked by a singular inaptitude or distaste for physical enquiries. His father, a poor colonist in Samos, was, apparently, not able to give him a very regular education. At eighteen he was sent to Athens, but was shortly afterwards obliged to rejoin his family, who were driven from Samos in 322, along with the other Athenian settlers, by a political revolution, and had taken refuge in Colophon, on the Asiatic coast. In the course of his wanderings, the future philosopher came across some public lecturers, who seem to have instructed him in the physics of Democritus, and perhaps also in the scepticism of Pyrrho; but of such a steady discipline as Plato passed through during his ten years�� intercourse with Socrates, Aristotle during his twenty years�� studies under Plato, and Zeno during his similarly protracted attendance at the various schools of Athens, there is no trace whatever. Epicurus always described himself as self-taught, meaning that his knowledge had been acquired by reading instead of by listening; and we find in him the advantages as well as the defects common to self-taught men in all ages��considerable freshness and freedom from scholastic prejudices, along with a59 certain narrowness of sympathies, incompleteness of information, inaptitude for abstract reasoning, and last, but not least, an enormous opinion of his own abilities, joined to an overweening contempt for those with whose opinions he did not agree. After teaching for some time in Mityl��n��, Epicurus established himself as the head of a school in Athens, where he bought a house and garden. In the latter he lectured and gathered round him a band of devoted friends, among whom women were included, and who were wont to assemble for purposes of social recreation not less than of philosophic discipline. Just before his death, which occurred in the year 270, he declared in a letter to his friend and destined successor Hermarchus, that the recollection of his philosophical achievements had been such a source of pleasure as to overcome the agonies of disease, and to make the last day the happiest of his life.121 For the rest, Epicurus secluded himself, on principle, from the world, and few echoes of his teaching seem to have passed beyond the circle of his immediate adherents. Thus, whatever opportunities might otherwise have offered themselves of profiting by adverse criticism were completely lost.122