TWO:Machines do not create or consume, but only transmit and apply power; and it is only by conceiving of power as a constant element, independent of every kind of machinery, that the learner can reach a true understanding of the nature of machines. When once there is in the mind a fixed conception of power, dissociated from every kind of mechanism, there is laid, so to speak, a solid foundation on which an understanding of machines may be built up.We have now reached a point in history where the Greek intellect seems to be struck with a partial paralysis, continuing for a century and a half. During that period, its activitywhat there is of itis shown only in criticism and erudition. There is learning, there is research, there is acuteness, there is even good taste, but originality and eloquence are extinct. Is it a coincidence, or is it something more, that this interval of sterility should occur simultaneously with the most splendid period of Latin literature, and that the new birth of Greek culture should be followed by the decrepitude and death of the Latin muse? It is certain that in modern Europe, possessing as it does so many independent sources of vitality, the flowering-times of different countries rarely coincide; England and Spain, from the middle of the sixteenth to the middle of the seventeenth century, being the only instances that we can recall of two countries almost simultaneously reaching the highest point of their literary development. Possibly, during the great age of Latin literature, all the most aspiring Greeks found employment as tutors in Roman families; while the reading public of the West were too much absorbed by the masterpieces composed in their own language,166 or too elated with the consciousness of a new superiority, to encourage the rivalry of those from whom they had wrested not only poetical independence, but also, what till then had never been disputed with the Greeks, supreme dominion in the world of mind. It is, at any rate, significant that while Greek was the favourite language of Roman lovers in the time of Lucretius and again in the time of Juvenal, there are no allusions to its having been employed by them during the intermediate period.264 Be this as it may, from the fall of the Republic to the time of Trajan, philosophy, like poetry and eloquenceor at least all philosophy that was positive and practicalbecame domiciled in Rome, and received the stamp of the Roman character. How Stoicism was affected by the change has been pointed out in a former chapter. What we have now to study is chiefly the reaction of Rome on the Greek mind, and its bearing on the subsequent development of thought.
TWO:There was a long, long silence, a silence that could be felt.
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TWO:Returning to Epicurus, we have next to consider how he obtained the various motions required to bring his atoms into those infinite combinations of which our world is only the most recent. The conception of matter naturally endowed with capacities for moving in all directions indifferently was unknown to ancient physics, as was also that of mutual attraction and85 repulsion. Democritus supposed that the atoms all gravitated downward through infinite space, but with different velocities, so that the lighter were perpetually overtaken and driven upwards by the heavier, the result of these collisions and pressures being a vortex whence the world as we see it has proceeded.163 While the atomism of Democritus was, as a theory of matter, the greatest contribution ever made to physical science by pure speculation, as a theory of motion it was open to at least three insuperable objections. Passing over the difficulty of a perpetual movement through space in one direction only, there remained the self-contradictory assumption that an infinite number of atoms all moving together in that one direction could find any unoccupied space to fall into.164 Secondly, astronomical discoveries, establishing as they did the sphericity of the earth, had for ever disproved the crude theory that unsupported bodies fall downward in parallel straight lines. Even granting that the astronomers, in the absence of complete empirical verification, could not prove their whole contention, they could at any rate prove enough of it to destroy the notion of parallel descent; for the varying elevation of the pole-star demonstrated the curvature of the earths surface so far as it was accessible to observation, thus showing that, within the limits of experience, gravitation acted along convergent lines. Finally, Aristotle had pointed out that the observed differences in the velocity of falling bodies were due to the atmospheric resistance, and that, consequently, they would all move at the same rate in such an absolute vacuum as atomism assumed.165 Of these objections Epicurus ignored the first two, except, apparently, to the extent of refusing to believe in the antipodes. The third he acknowledged, and set himself to evade it by a hypothesis striking at the root of all scientific86 reasoning. The atoms, he tells us, suffer a slight deflection from the line of perpendicular descent, sufficient to bring them into collision with one another; and from this collision proceeds the variety of movement necessary to throw them into all sorts of accidental combinations. Our own free will, says Lucretius, furnishes an example of such a deflection whenever we swerve aside from the direction in which an original impulse is carrying us.166 That the irregularity thus introduced into Nature interfered with the law of universal causation was an additional recommendation of it in the eyes of Epicurus, who, as we have already mentioned, hated the physical necessity of the philosophers even more than he hated the watchful interfering providence of the theologians. But, apparently, neither he nor his disciples saw that in discarding the invariable sequence of phenomena, they annulled, to the same extent, the possibility of human foresight and adaptation of means to ends. There was no reason why the deflection, having once occurred, should not be repeated infinitely often, each time producing effects of incalculable extent. And a further inconsequence of the system is that it afterwards accounts for human choice by a mechanism which has nothing to do with free-will.167 CHAPTER IV
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