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THREE:So far as he can be said to have studied science at all, the motive of Epicurus was hatred for religion far more than love for natural law. He seems, indeed, to have preserved that aversion for Nature which is so characteristic of the earlier Greek Humanists. He seems to have imagined that by refusing to tie himself down to any one explanation of external phenomena, he could diminish their hold over the mind of man. For when he departs from his usual attitude of suspense and reserve, it is to declare dogmatically that the heavenly bodies are no larger than they appear to our senses, and perhaps smaller than they sometimes appear.170 The only88 arguments adduced on behalf of this outrageous assertion were that if their superficial extension was altered by transmission, their colour would be altered to a still greater degree; and the alleged fact that flames look the same size at all distances.171 It is evident that neither Epicurus nor Lucretius, who, as usual, transcribes him with perfect good faith, could ever have looked at one lamp-flame through another, or they would have seen that the laws of linear perspective are not suspended in the case of self-luminous bodies��a fact which does not tell much for that accurate observation supposed to have been fostered by their philosophy.172 The truth is, that Epicurus disliked the oppressive notion of a sun several times larger than the earth, and was determined not to tolerate it, be the consequences to fact and logic what they might.A distinct parallelism may be traced in the lines of evolution along which we have accompanied our two opposing schools. While the Academicians were coming over to the Stoic theory of cognition, the Stoics themselves were moving in the same general direction, and seeking for an external reality more in consonance with their notions of certainty than the philosophy of their first teachers could supply. For, as originally constituted, Stoicism included a large element of scepticism, which must often have laid its advocates open to the charge of inconsistency from those who accepted the same principle in a more undiluted form. The Heracleitean flux adopted by Zeno as the physical basis of his system, was164 much better suited to a sceptical than to a dogmatic philosophy, as the use to which it was put by Protagoras and Plato sufficiently proved; and this was probably the reason why Bo��thus and Panaetius partially discarded it in favour of a more stable cosmology. The dialectical studies of the school also tended to suggest more difficulties than they could remove. The comprehensive systematisation of Chrysippus, like that of Plato and Aristotle, had for its object the illustration of each topic from every point of view, and especially from the negative as well as from the positive side. The consequence was that his indefatigable erudition had collected a great number of logical puzzles which he had either neglected or found himself unable to solve. There would, therefore, be a growing inclination to substitute a literary and rhetorical for a logical training: and as we shall presently see, there was an extraneous influence acting in the same direction. Finally, the rigour of Stoic morality had been strained to such a pitch that its professors were driven to admit the complete ideality of virtue. Their sage had never shown himself on earth, at least within the historical period; and the whole world of human interests being, from the rational point of view, either a delusion or a failure, stood in permanent contradiction to their optimistic theory of Nature. The Sceptics were quite aware of this practical approximation to their own views, and sometimes took advantage of it to turn the tables on their opponents with telling effect. Thus, on the occasion of that philosophical embassy with an account of which the present chapter began, when a noble Roman playfully observed to Carneades, ��You must think that I am not a Praetor as I am not a sage, and that Rome is neither a city nor a state,�� the great Sceptic replied, turning to his colleague Diogenes, ��That is what my Stoic friend here would say.��262 And Plutarch, in two sharp attacks on the Stoics, written from the Academic point of view, and probably165 compiled from documents of a much earlier period,263 charges them with outraging common sense by their wholesale practical negations, to at least as great an extent as the Sceptics outraged it by their suspense of judgment. How the ethical system of Stoicism was modified so as to meet these criticisms has been related in a former chapter; and we have just seen how Posidonius, by his partial return to the Platonic psychology, with its division between reason and impulse, contributed to a still further change in the same conciliatory sense.

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THREE:Opposed to the maintenance of standard dimensions are the variations in size due to temperature. This difficulty applies alike to gauging implements and to parts that are to be tested; yet in this, as in nearly every phenomenon connected with matter, we have succeeded in turning it to some useful purpose. Bands of iron, such as the tires of wheels when heated, can be 'shrunk' on, and a compressive force and security attained, which would be impossible by forcing the parts together both at the same temperature. Shrinking has, however, been almost entirely abandoned for such joints as can be accurately fitted.

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