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THREE:(1.) In what respect are air and water like belts and gearing, as means to transmit power?��(2.) What are some of the principal advantages gained by employing air to operate railway brakes?��(3.) Name some of the advantages of centralising motive power.��(4.) Are the conditions of working an engine the same whether air or steam is employed?It was at this juncture that the voluntary withdrawal of an older fellow-pupil placed Arcesilaus at the head of the Academy. The date of his accession is not given, but we are told that he died 241 or 240 B.C. in the seventy-fifth year of his age. He must, therefore, have flourished a generation later than Zeno and Epicurus. Accomplished, witty, and generous, his life is described by some as considerably less austere than that of the excellent nonentities whom he succeeded. Yet its general goodness was testified to by no less an authority than his contemporary, the noble Stoic, Cleanthes. ��Do not blame Arcesilaus,�� exclaimed the latter146 to an unfriendly critic; ��if he denies duty in his words, he affirms it in his deeds.�� ��You don��t flatter me,�� observed Arcesilaus. ��It is flattering you,�� rejoined Cleanthes, ��to say that your actions belie your words.��230 It might be inferred from this anecdote that the scepticism of the new teacher, like that of Carneades after him, was occasionally exercised on moral distinctions, which, as then defined and deduced, were assuredly open to very serious criticism. Even so, in following the conventional standard of the age, he would have been acting in perfect consistency with the principles of his school. But, as a matter of fact, his attacks seem to have been exclusively aimed at the Stoic criterion of certainty. We have touched on this difficult subject in a former chapter, but the present seems a more favourable opportunity for setting it forth in proper detail.