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TWO:This proposition argues the expediency of reducing the proportions of mill gearing and increasing its speed, a change which has gradually been going on for fifty years past; but there are opposing conditions which make a limit in this direction, such as the speed at which bearing surfaces may run, centrifugal strain, jar, and vibration. The object is to fix upon a point between what high speed, light weight, cheapness of cost suggest, and what the conditions of practical use and endurance demand.It will be seen from the foregoing passage how strong a hold the old Greek notion of an encircling limit had on the mind of Aristotle, and how he transformed it back from the high intellectual significance given to it by Plato into its original sense of a mere space-enclosing figure. And it will also be seen how he credits his spheres with a full measure of that moving power which, according to his rather unfair criticism, the Platonic Ideas did not possess. His astronomy also supplied him with that series of graduated transitions between two extremes in which Greek thought so much delighted. The heavenly bodies mediate between God and the earth; partly active and partly passive, they both receive and communicate the moving creative impulse. The four terrestrial elements are moved in the various categories of substance, quantity, quality, and place; the aether moves in place only. God remains ��without variableness or shadow of a change.�� Finally, by its absolute simplicity and purity, the aether mediates between the coarse matter perceived by our senses and the absolutely immaterial Nous, and is itself supposed to be pervaded by a similar gradation of fineness from top to bottom. Furthermore, the upper fire, which must not be confounded with flame, furnishes a connecting link between the aether and the other elements, being related to them as Form to Matter, or as agent to patient; and, when the elements are decomposed into their constituent qualities, hot and cold occupy a similar position with regard to wet and dry.

TWO:So far we have followed the evolution of Plato��s philosophy as it may have been effected under the impulse of purely theoretical motives. We have now to consider what form was imposed on it by the more imperious exigencies of practical experience. Here, again, we find Plato taking up and continuing the work of Socrates, but on a vastly greater scale. There was, indeed, a kind of pre-established harmony between the expression of thought on the one hand and the increasing need for its application to life on the other. For the spread of public corruption had gone on pari passu with the development of philosophy. The teaching of Socrates was addressed to individuals, and dealt chiefly with private morality. On other points he was content to accept the law of the land and the established political constitution as sufficiently safe guides. He was not accustomed to see them defied or perverted into instruments of selfish aggrandisement; nor, apparently, had the possibility of such a contingency occurred to him. Still less did he imagine that all social institutions then existing were radically wrong. Hence the personal virtues held a more important place in his system than the social virtues. His attacks were directed230 against slothfulness and self-indulgence, against the ignorant temerity which hurried some young men into politics before their education was finished, and the timidity or fastidiousness which prevented others from discharging the highest duties of citizenship. Nor, in accepting the popular religion of his time, had he any suspicion that its sanctions might be invoked on behalf of successful violence and fraud. We have already shown how differently Plato felt towards his age, and how much deeper as well as more shameless was the demoralisation with which he set himself to contend. It must also be remembered how judicial proceedings had come to overshadow every other public interest; and how the highest culture of the time had, at least in his eyes, become identified with the systematic perversion of truth and right. These considerations will explain why Greek philosophy, while moving on a higher plane, passed through the same orbit which had been previously described by Greek poetry. Precisely as the lessons of moderation in Homer had been followed by the lessons of justice in Aeschylus, precisely as the religion which was a selfish traffic between gods and men, and had little to tell of a life beyond the grave, was replaced by the nobler faith in a divine guardianship of morality and a retributive judgment after death��so also did the Socratic ethics and the Socratic theology lead to a system which made justice the essence of morality and religion its everlasting consecration."Quick!" the Countess whispered. "You managed that very cleverly, Balmayne. We have a credible witness who saw this creature leave the house, thanks to you."