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ONE:The scepticism of Aristippus and the Cyrenaics mediated between the views of Protagoras and those of Gorgias, while marking an advance on both. According to this school, we know nothing beyond our own feelings, and it must be left undecided whether they are caused by an external reality or not. Nor can the feelings of one individual justify us in reasoning to the existence of similar feelings in the mind of another individual.221 It might be objected that the arguments advanced in support of the latter assertion are suicidal, for they are derived from the abnormal states of consciousness accompanying particular diseases, or else from the divergences of taste exhibited by different individuals even when in good health,��an apparent admission that we are sufficiently well acquainted with the phenomena in question to institute a comparison between them, which, by hypothesis, is impossible. And this is, in fact, the method by which Mr. Herbert Spencer has endeavoured to upset the whole theory of subjective idealism, as involving at every step an assumption of the very realities that it professes to deny. But the Cyrenaic and the modern idealist have a perfect right to show that the assumptions of their adversaries are self-contradictory; and the readiest way of so doing is to reason from them as if they were true. The real answer to that extreme form of idealism which denies the possibility of making known our feelings to each other is that, our bodies being similarly constructed and responding to similar impressions by similar manifestations,133 I have the same sort of warrant for assuming that your states of consciousness are like mine that I have for assuming you to exist at all. The inference must, of course, be surrounded by proper precautions, such as are seldom used by unscientific reasoners. We must make sure that the structure is the same and that the excitement is the same, or that their differences, if any, are insignificant, before we can attribute the same value to the same manifestations of feeling on the part of different persons; but that this can be done, at least in the case of the elementary sensations, is shown by the easy detection of such anomalies as colour-blindness where they exist.I think proper to point out these peculiarities, not so much from any importance they may have in themselves, but to suggest critical investigation, and to dissipate any preconceived opinions of forging being a simple matter, easy to learn, and involving only commonplace operations. TWO:It was their habit of teaching rhetoric as an art which raised the fiercest storm of indignation against Protagoras and his colleagues. The endeavour to discover rules for addressing a tribunal or a popular assembly in the manner best cal94culated to win their assent had originated quite independently of any philosophical theory. On the re-establishment of order, that is to say of popular government, in Sicily, many lawsuits arose out of events which had happened years before; and, owing to the lapse of time, demonstrative evidence was not available. Accordingly, recourse was had on both sides to arguments possessing a greater or less degree of probability. The art of putting such probable inferences so as to produce persuasion demanded great technical skill; and two Sicilians, Corax and Tisias by name, composed treatises on the subject. It would appear that the new-born art was taken up by Protagoras and developed in the direction of increased dialectical subtlety. We are informed that he undertook to make the worse appear the better reason; and this very soon came to be popularly considered as an accomplishment taught by all philosophers, Socrates among the rest. But if Protagoras merely meant that he would teach the art of reasoning, one hardly sees how he could have expressed himself otherwise, consistently with the antithetical style of his age. We should say more simply that a case is strengthened by the ability to argue it properly. It has not been shown that the Protagorean dialectic offered exceptional facilities for maintaining unjust pretensions. Taken, however, in connexion with the humanistic teaching, it had an unsettling and sceptical tendency. All belief and all practice rested on law, and law was the result of a convention made among men and ultimately produced by individual conviction. What one man had done another could undo. Religious tradition and natural right, the sole external standards, had already disappeared. There remained the test of self-consistency, and against this all the subtlety of the new dialectic was turned. The triumph of Eristic was to show that a speaker had contradicted himself, no matter how his statements might be worded. Moreover, now that reference to an objective reality was disallowed, words were put in the place95 of things and treated like concrete realities. The next step was to tear them out of the grammatical construction, where alone they possessed any truth or meaning, each being simultaneously credited with all the uses which at any time it might be made to fulfil. For example, if a man knew one thing he knew all, for he had knowledge, and knowledge is of everything knowable. Much that seems to us tedious or superfluous in Aristotle��s expositions was intended as a safeguard against this endless cavilling. Finally, negation itself was eliminated along with the possibility of falsehood and contradiction. For it was argued that ��nothing�� had no existence and could not be an object of thought.71"After all it matters little," he said.