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ONE:Machine-drawing may in some respects be said to bear the same relation to mechanics that writing does to literature; persons may copy manuscript, or write from dictation, of what they do not understand; or a mechanical draughtsman may make drawings of a machine he does not understand; but neither such writing or drawing can have any value beyond that of ordinary labour. It is both necessary and expected that a draughtsman shall understand all the various processes of machine construction, and be familiar with the best examples that are furnished by modern practice.So far we have spoken as if Plato regarded the various false polities existing around him as so many fixed and disconnected types. This, however, was not the case. The present state of things was bad enough, but it threatened to become worse wherever worse was possible. The constitutions exhibiting a mixture of good and evil contained within themselves the seeds of a further corruption, and tended to pass into the form standing next in order on the downward slope. Spartan timocracy must in time become an oligarchy, to oligarchy would succeed democracy, and this would end in tyranny, beyond which no further fall was possible.125 The degraded condition of Syracuse seemed likely to be the last outcome of Hellenic civilisation. We know not how far the gloomy forebodings of Plato may have been justified by his197 own experience, but he sketched with prophetic insight the future fortunes of the Roman Republic. Every phase of the progressive degeneration is exemplified in its later history, and the order of their succession is most faithfully preserved. Even his portraits of individual timocrats, oligarchs, demagogues, and despots are reproduced to the life in the pages of Plutarch, of Cicero, and of Tacitus.