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TWO:He swung his head, signaled Dick, waved an arm, pointing. Dick and Larry stared, while Sandy poked Jeff and repeated his gestures.So far we have contrasted the Apologia with the Memorabilia. We have now to consider in what relation it stands to Plato��s other writings. The constructive dogmatic Socrates, who is a principal spokesman in some of them, differs widely from the sceptical Socrates of the famous Defence, and the difference has been urged as an argument for the historical authenticity of the latter.85 Plato, it is implied, would not115 have departed so far from his usual conception of the sage, had he not been desirous of reproducing the actual words spoken on so solemn an occasion. There are, however, several dialogues which seem to have been composed for the express purpose of illustrating the negative method supposed to have been described by Socrates to his judges, investigations the sole result of which is to upset the theories of other thinkers, or to show that ordinary men act without being able to assign a reason for their conduct. Even the Republic is professedly tentative in its procedure, and only follows out a train of thought which has presented itself almost by accident to the company. Unlike Charles Lamb��s Scotchman, the leading spokesman does not bring, but find, and you are invited to cry halves to whatever turns up in his company. TWO:Returning to Epicurus, we have next to consider how he obtained the various motions required to bring his atoms into those infinite combinations of which our world is only the most recent. The conception of matter naturally endowed with capacities for moving in all directions indifferently was unknown to ancient physics, as was also that of mutual attraction and85 repulsion. Democritus supposed that the atoms all gravitated downward through infinite space, but with different velocities, so that the lighter were perpetually overtaken and driven upwards by the heavier, the result of these collisions and pressures being a vortex whence the world as we see it has proceeded.163 While the atomism of Democritus was, as a theory of matter, the greatest contribution ever made to physical science by pure speculation, as a theory of motion it was open to at least three insuperable objections. Passing over the difficulty of a perpetual movement through space in one direction only, there remained the self-contradictory assumption that an infinite number of atoms all moving together in that one direction could find any unoccupied space to fall into.164 Secondly, astronomical discoveries, establishing as they did the sphericity of the earth, had for ever disproved the crude theory that unsupported bodies fall downward in parallel straight lines. Even granting that the astronomers, in the absence of complete empirical verification, could not prove their whole contention, they could at any rate prove enough of it to destroy the notion of parallel descent; for the varying elevation of the pole-star demonstrated the curvature of the earth��s surface so far as it was accessible to observation, thus showing that, within the limits of experience, gravitation acted along convergent lines. Finally, Aristotle had pointed out that the observed differences in the velocity of falling bodies were due to the atmospheric resistance, and that, consequently, they would all move at the same rate in such an absolute vacuum as atomism assumed.165 Of these objections Epicurus ignored the first two, except, apparently, to the extent of refusing to believe in the antipodes. The third he acknowledged, and set himself to evade it by a hypothesis striking at the root of all scientific86 reasoning. The atoms, he tells us, suffer a slight deflection from the line of perpendicular descent, sufficient to bring them into collision with one another; and from this collision proceeds the variety of movement necessary to throw them into all sorts of accidental combinations. Our own free will, says Lucretius, furnishes an example of such a deflection whenever we swerve aside from the direction in which an original impulse is carrying us.166 That the irregularity thus introduced into Nature interfered with the law of universal causation was an additional recommendation of it in the eyes of Epicurus, who, as we have already mentioned, hated the physical necessity of the philosophers even more than he hated the watchful interfering providence of the theologians. But, apparently, neither he nor his disciples saw that in discarding the invariable sequence of phenomena, they annulled, to the same extent, the possibility of human foresight and adaptation of means to ends. There was no reason why the deflection, having once occurred, should not be repeated infinitely often, each time producing effects of incalculable extent. And a further inconsequence of the system is that it afterwards accounts for human choice by a mechanism which has nothing to do with free-will.167II. TWO:Probably few contributed so much to the change as Socrates, notwithstanding his general piety and the credulity which he exhibited on this particular point. For his ethical and dialectical training, combined with that careful study of facts which he so earnestly recommended, went very far towards making a consultation of the oracle superfluous; and he did actually impress on his auditors the duty of dispensing with its assistance in all cases except those where a knowledge of the future was necessary and could not be otherwise obtained.340 Even so superstitious a believer as Xenophon improved on his master��s lessons in this respect, and instead of asking the Pythia whether he should take service with the younger Cyrus��as Socrates had advised��simply asked to what god he should sacrifice before starting on the expedition. Towards the beginning of our era, as is well known, the Greek oracles had fallen into complete neglect and silence. TWO:The word Sophist in modern languages means one who purposely uses fallacious arguments. Our definition was probably derived from that given by Aristotle in his Topics, but does not entirely reproduce it. What we call sophistry was with him eristic, or the art of unfair disputation; and by Sophist he means one who practises the eristic art for gain. He also defines sophistry as the appearance without the reality of wisdom. A very similar account of the Sophists and their art is given by Plato in what seems to be one of his later dialogues; and another dialogue, probably composed some time previously, shows us how eristic was actually practised by two Sophists, Euthyd��mus and Dionysod?rus, who had learned the art, which is represented as a very easy accomplishment, when already old men. Their performance is not edifying; and one only wonders how any Greek could have been induced to pay for the privilege of witnessing such an exhibition. But the word Sophist, in its original signification, was an entirely honourable name. It meant a sage, a wise and learned man, like Solon, or, for that matter, like Plato and Aristotle themselves. The interval between these widely-different connotations is filled up and explained by a number of individuals as to whom our information is principally, though by no means entirely, derived from Plato. All of them were professional teachers, receiving payment for their services; all made a particular study of language, some aiming more particularly at accuracy, others at beauty of expression. While no common doctrine can be attributed to them as a class, as individuals they are connected by a series of graduated transitions, the final outcome of which will enable us to understand how, from a title of respect, their name could be turned into a byword of reproach. The Sophists, concerning whom some details have been trans77mitted to us, are Protagoras, Gorgias, Prodicus, Hippias, P?lus, Thrasymachus, and the Eristics already mentioned. We have placed them, so far as their ages can be determined, in chronological order, but their logical order is somewhat different. The first two on the list were born about 480 B.C., and the second pair possibly twenty years later. But neither Protagoras nor Gorgias seems to have published his most characteristic theories until a rather advanced time of life, for they are nowhere alluded to by the Xenophontic Socrates, who, on the other hand, is well acquainted with both Prodicus and Hippias, while, conversely, Plato is most interested in the former pair. We shall also presently see that the scepticism of the elder Sophists can best be explained by reference to the more dogmatic theories of their younger contemporaries, which again easily fit on to the physical speculations of earlier thinkers.