ONE:(1.) What limits the speed at which the reciprocating parts of machines may act?��(2.) What is the nature of reciprocal motion produced by cranks?��(3.) Can reciprocating movement be uniform in such [108] machines as power-hammers, saws, or pumps?��(4.) What effect as to the rate of movement is produced by the elastic connections of a trip-hammer?

ONE:CHAPTER XXVII. A GLASS OF WINE.

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Unquestionably Plotinus was influenced by the supernaturalistic movement of his age, but only as Plato had been influenced by the similar reaction of his time; and just as the Athenian philosopher had protested against the superstitions which he saw gaining ground, so also did the Alexandrian philosopher protest, with far less vigour it is true, but still to some extent, against the worse extravagances universally entertained by his contemporaries. Among these, to judge by numerous allusions in his writings, astrology and magic held the foremost place. That there was something in both, he did not venture to deny, but he constantly endeavours to extenuate their practical significance and to give a more philosophical interpretation to the alleged phenomena on which they were based. Towards the old polytheism, his attitude, without being hostile, is perfectly independent. We can see this even in his life, notwithstanding the religious colouring thrown over it by Porphyry. When invited by his disciple Amelius to join in the public worship of the gods, he proudly answered, ��It is their business to come to me, not mine to go to them.��511 In allegorising the old myths, he handles them with as much freedom as Bacon, and evidently with no more belief in their historical character.512 In giving the name of God to his supreme principle, he is careful to exclude nearly every attribute associated with divinity even in the purest forms of contemporary theology. Personality, intelligence, will, and even existence, are expressly denied to the One. Although the first cause and highest good of all things, it is so not in a religious but in an abstract, metaphysical sense. The Nous with its ideal offspring and the world-soul are also spoken of as gods; but their personality, if they have any, is of the most shadowy description, and there is no reason for thinking that Plotinus ever wor345shipped them himself or intended them to be worshipped by his disciples. Like Aristotle, he attributes animation and divinity to the heavenly bodies, but with such careful provisions against an anthropomorphic conception of their nature, that not much devotional feeling is likely to have mingled with the contemplation of their splendour. Finally, we arrive at the daemons, those intermediate spirits which play so great a part in the religion of Plutarch and the other Platonists of the second century. With regard to these, Plotinus repeats many of the current opinions as if he shared them; but his adhesion is of an extremely tepid character; and it may be doubted whether the daemons meant much more for him than for Plato.513In working with dead blows, no steam is admitted under the piston until the hammer has finished its down stroke, and expended its momentum upon the work. So different is the effect produced by these two plans of operating, that on most kinds of work a hammer of fifty pounds, working with dead blows, will perform the same duty that one of a hundred pounds will, when acting by elastic or cushioned blows.Besides the revival of Platonism, three causes had conspired to overthrow the supremacy of Aristotle. The literary Renaissance with its adoration for beauty of form was alienated by the barbarous dialect of Scholasticism; the mystical theology of Luther saw in it an ally both of ecclesiastical authority and of human reason; and the new spirit of passionate revolt against all tradition attacked the accepted philosophy in common with every other branch of the official university curriculum. Before long, however, a reaction set in. The innovators discredited themselves by an extravagance, an ignorance, a credulity, and an intolerance worse than anything in the teaching which they decried. No sooner was the Reformation organised as a positive doctrine than it fell back for support on the only model of systematic thinking at that time to be found. The Humanists were conciliated by having the original text of Aristotle placed before them; and they readily believed, what was not true, that it contained a wisdom which had eluded mediaeval research. But the great scientific movement of the sixteenth century contributed, more than any other impulse, to bring about an Aristotelian reaction. After winning immortal triumphs in every branch of art and literature, the Italian intellect threw itself with equal vigour into the investigation of physical phenomena. Here Plato could give little help, whereas Aristotle supplied a methodised description of the whole field to be explored, and contributions of extraordinary value towards the under372standing of some, at least, among its infinite details. And we may measure the renewed popularity of his system not only by the fact that Cesalpino, the greatest naturalist of the age, professed himself its adherent, but also by the bitterness of the criticisms directed against it, and the involuntary homage offered by rival systems which were little more than meagre excerpts from the Peripatetic ontology and logic.