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TWO:(1.) Why does machinery involve so many cylindrical forms?��(2.) Why is it desirable to have separate feed gear for turning and screw cutting?��(3.) What is gained by the frictional starting gearing now applied to the finer class of lathes?��(4.) How may the alignment of a lathe be tested?��(5.) What kind of deviation with a lathe carriage will most affect the truth of work performed?��(6.) How may an oval hole be bored on a common slide lathe?��(7.) How can the angular [128] ways of a lathe and the corresponding grooves in a carriage be planed to fit without employing gauges?��(8.) Give the number of teeth in two wheels to cut a screw of ten threads, when a leading screw is four threads per inch?According to Sir A. Grant, it is by the mystical and poetical side of his nature that Plato differs from Aristotle. The one ��aspired to a truth above the truth of scientific knowledge��; the other to ��methodised experience and the definite.��182 Now, setting aside the question whether there is any truth above the truth of scientific knowledge, we doubt very much whether Plato believed in its existence. He held that the most valuable truth was that which could be imparted to others by a process even more rigorous than mathematical reasoning; and there was no reality, however transcendent, that he did not hope to bring within the grasp of a dialectic without which even the meanest could not be understood. He did, indeed, believe that, so far, the best and wisest of mankind had owed much more to a divinely implanted instinct than to any conscious chain of reflection; but he distinctly293 asserted the inferiority of such guidance to the light of scientific knowledge, if this could be obtained, as he hoped that it could. On the other hand, Aristotle was probably superior to Plato as a poet; and in speaking about the highest realities he uses language which, though less rich and ornate than his master��s, is not inferior to it in force and fervour; while his metaphysical theories contain a large element of what would now be considered mysticism, that is, he often sees evidence of purpose and animation where they do not really exist. His advantage in definiteness is, of course, indisputable, but this was, perhaps, because he came after Plato and profited by his lessons.

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