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THREE:It is strange, considering the simplicity of construction and the very important office filled by machines for cutting on plane surfaces, that they were not sooner invented and applied in metal work. Many men yet working at finishing, can remember when all flat surfaces were chipped and filed, and that long after engine lathes had reached a state of efficiency and were generally employed, planing machines were not known. This is no doubt to be accounted for in the fact that reciprocal movement, except that produced by cranks or eccentrics, was unknown or regarded as impracticable for useful purposes until late years, and when finally applied it was thought impracticable to have such movements operate automatically. This may seem quite absurd to even an apprentice of the present time, yet such reciprocating movement, as a mechanical problem, is by no means so simple as it may at first appear.Sometimes I felt as if I were dreaming and wanted to call myself back from this nightmare to another, better, and real world. And I thought constantly of the man who, by one word, had given the order for these murders, this arson; the man who severed husbands and fathers, wives and mothers, and children, who caused so many innocent people to be shot, who destroyed the results of many, many years of strict economy and strenuous industry.

THREE:Thus, then, the Socratic dialogue has a double aspect. It is, like all philosophy, a perpetual carrying of life into ideas and of ideas into life. Life is raised to a higher level by thought; thought, when brought into contact with life, gains movement and growth, assimilative and reproductive power. If action is to be harmonised, we must regulate it by universal principles; if our principles are to be efficacious, they must be adopted; if they are to be adopted, we must demonstrate them to the satisfaction of our contemporaries. Language, consisting as143 it does almost entirely of abstract terms, furnishes the materials out of which alone such an ideal union can be framed. But men do not always use the same words, least of all if they are abstract words, in the same sense, and therefore a preliminary agreement must be arrived at in this respect; a fact which Socrates was the first to recognise. Aristotle tells us that he introduced the custom of constructing general definitions into philosophy. The need of accurate verbal explanations is more felt in the discussion of ethical problems than anywhere else, if we take ethics in the only sense that Socrates would have accepted, as covering the whole field of mental activity. It is true that definitions are also employed in the mathematical and physical sciences, but there they are accompanied by illustrations borrowed from sensible experience, and would be unintelligible without them. Hence it has been possible for those branches of knowledge to make enormous progress, while the elementary notions on which they rest have not yet been satisfactorily analysed. The case is entirely altered when mental dispositions have to be taken into account. Here, abstract terms play much the same part as sensible intuitions elsewhere in steadying our conceptions, but without possessing the same invariable value; the experiences from which those conceptions are derived being exceedingly complex, and, what is more, exceedingly liable to disturbance from unforeseen circumstances. Thus, by neglecting a series of minute changes the same name may come to denote groups of phenomena not agreeing in the qualities which alone it originally connoted. More than one example of such a gradual metamorphosis has already presented itself in the course of our investigation, and others will occur in the sequel. Where distinctions of right and wrong are involved, it is of enormous practical importance that a definite meaning should be attached to words, and that they should not be allowed, at least without express agreement, to depart from the recognised acceptation: for such words, connoting as they do the approval or disap144proval of mankind, exercise a powerful influence on conduct, so that their misapplication may lead to disastrous consequences. Where government by written law prevails the importance of defining ethical terms immediately becomes obvious, for, otherwise, personal rule would be restored under the disguise of judicial interpretation. Roman jurisprudence was the first attempt on a great scale to introduce a rigorous system of definitions into legislation. We have seen, in the preceding chapter, how it tended to put the conclusions of Greek naturalistic philosophy into practical shape. We now see how, on the formal side, its determinations are connected with the principles of Socrates. And we shall not undervalue this obligation if we bear in mind that the accurate wording of legal enactments is not less important than the essential justice of their contents. Similarly, the development of Catholic theology required that its fundamental conceptions should be progressively defined. This alone preserved the intellectual character of Catholicism in ages of ignorance and superstition, and helped to keep alive the reason by which superstition was eventually overthrown. Mommsen has called theology the bastard child of Religion and Science. It is something that, in the absence of the robuster parent, its features should be recalled and its tradition maintained even by an illegitimate offspring.Gravity, or "overshot" wheels, as they are called, for some reasons will seem to be the most effective, and capable of utilising the whole effect due to the gravity of the water; but in practice this is not the case, and it is only under peculiar conditions that wheels of this class are preferable to turbine wheels, and in no case will they give out a greater per cent. of power than turbine wheels of the best class. The reasons for this will be apparent by examining the conditions of their operation.