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FORE:In order to render what is said of shop processes more easily understood, it will be necessary to change the order in which they have been named. Designing, and many matters connected with the operation of machines, will be more easily learned and understood after having gone through with what may be called the constructive operations, such as involve manual skill.

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FORE:Writers on mechanical subjects, as a rule, have only theoretical knowledge, and consequently seldom deal with workshop processes. Practical engineers who have passed through a successful experience and gained that knowledge which is most difficult for apprentices to acquire, have generally neither inclination nor incentives to write books. The changes in manipulation are so frequent, and the operations so diversified, that practical men have a dread of the criticisms which such changes and the differences of opinion may bring forth; to this may be added, that to become a practical mechanical engineer consumes too great a share of one's life to leave time for other qualifications required in preparing books. For these reasons "manipulation" has been neglected, and for the same reasons must be imperfectly treated here. The purpose is not so much to instruct in shop processes as to point out how they can be best learned, the reader for the most part exercising his own judgment and reasoning powers. It will be attempted to point out how each simple operation is governed by some general principle, and how from such operations, by tracing out the principle which lies at the bottom, it is possible to deduce logical conclusions as to what is right or wrong, expedient or inexpedient. In this way, it is thought, can [6] be established a closer connection between theory and practice, and a learner be brought to realise that he has only his reasoning powers to rely on; that formul?, rules, tables, and even books, are only aids to this reasoning power, which alone can master and combine the symbol and the substance.Besides the machine tools named, there are special machines to be found in most works, machines directed to the performance of certain work; by a particular adaptation such machines are rendered more effective, but they are by such adaptation unfitted for general purposes.

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FORE:The other great ethical method of the eighteenth century, its hedonism, was closely connected with the sceptical movement in speculative philosophy, and, like that, received an entirely new significance by becoming associated with the idea of law. Those who isolate man from the universe are necessarily led to seek in his interests as such the sole regulator of his actions, and their sole sanction in the opinion of his fellows. Protagoras went already so far, notwithstanding his unwillingness to recognise pleasure as the supreme end; and in the system of his true successor, Aristippus, the most extreme hedonism goes hand in hand with the most extreme idealism; while with Epicurus, again, both are tempered by the influence of naturalism, imposing on him its conceptions of objective law alike in science and in practice. Still his system leaned heavily to the side of self-gratification pure and simple; and it was reserved for modern thought to establish a complete equilibrium between the two competing tendencies of Greek ethics. This has been effected in Utilitarianism; and those critics are entirely mistaken who, like M. Guyau, regard that system as a mere reproduction of Epicureanism. It might with full as much reason be called a modern version of Stoicism. The idea of humanity is essentially Stoic; to work for the good of humanity was a424 Stoic precept; and to sacrifice one��s own pleasure for that higher good is a virtue which would have satisfied the most rigorous demands of a Cleanthes, an Epict��tus, or an Aurelius.

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FORE:[170]Thus the final effect of its communion with the Roman mind was not so much to develope Greek philosophy any further, or to reconcile its warring sects with one another, as to aid in their decomposition by throwing them back on the184 earlier forms whence they had sprung. Accordingly we find that the philosophic activity of Hellas immediately before and after the Christian era��so far as there was any at all��consisted in a revival of the Pythagorean and Cynic schools, accompanied by a corresponding resuscitation of primitive Scepticism. This last takes the shape of a very distinct protest against the fashionable naturalism of the age, just as the scepticism of Protagoras and Gorgias��if our view be correct��had once been called forth by the naturalism of Prodicus and Hippias. The principal representative, if not the founder, of Neo-Scepticism was Aenesid��mus, who taught in Alexandria, when we are not informed, but probably after the middle of the first century A.D.291 An avowed disciple of Pyrrho, his object was to reassert the sceptical principle in its original purity, especially as against the Academicians, whom he charged with having first perverted and then completely abandoned it.292 Aenesid��mus would hear nothing of probabilities nor of moral certainties. He also claimed to distinguish himself from the Academicians by refusing to assert even so much as that nothing can be asserted; but it appears that, in this point, he had been fully anticipated by Arcesilaus and Carneades.293 For the rest, his own Scepticism recalls the method of Gorgias and Protagoras much more distinctly than the method of the New Academy��a fresh illustration of the archaic and revivalist tendencies displayed by philosophy at185 this period. In other words, it is not against the reasoning processes that his criticisms are directed, but against the theory of causation on the objective side, and against the credibility of our immediate perceptions on the subjective side.294 But, in both directions, he has worked out the difficulties of the old Sophists with a minuteness and a precision unknown to them; and some of his points have been found worth repeating in a different connexion by modern critics. Thus, in analysing the theory of causation, he draws attention to the plurality of causes as an obstacle to connecting any given consequent with one antecedent more than with another; to the illegitimate assumption that the laws inferred from experience hold good under unknown conditions; to the arbitrary assumption of hypothetical causes not evinced by experience; and to the absurdity of introducing a new difficulty for the purpose of explaining an old one.295 With regard to causation itself, Aenesid��mus seems to have resolved it into action and reaction, thus eliminating the condition of186 antecedence and consequence, without which it becomes unintelligible.296

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