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ONE:It may also be mentioned that lathes constructed with angular guides, have usually such ways for the moving heads as well as for the carriages; this gives the advantage of firmly binding the [125] two sides of the frame together in fastening the moving head, which in effect becomes a strong girt across the frame; the carriages also have an equal and independent hold on both sides of a shear. In following this matter thus far, it may be seen how many conditions may have to be considered in reasoning about so apparently simple a matter as the form of ways for lathe carriages; we might even go on to many more points that have not been mentioned; but what has been explained will serve to show that the matter is not one of opinion alone, and that without practical advantages, machine tool-makers will not follow the most expensive of these two modes of mounting lathe carriages.The immortality of the soul is a subject on which idealistic philosophers habitually express themselves in terms of apparently studied ambiguity, and this is especially true of Plotinus. Here, as elsewhere, he repeats the opinions and arguments of Plato, but with certain developments which make his adhesion to the popular belief in a personal duration after death considerably more doubtful than was that of his master. One great difficulty in the way of Plato��s doctrine, as commonly understood, is that it attributes a permanence to individuals, which, on the principles of his system, should belong only to general ideas. Now, at first sight, Plotinus seems to evade this difficulty by admitting everlasting ideas of individuals no less than of generic types.514 A closer examination, however, shows that this view is even more unfavourable than Plato��s to the hope of personal immortality. For either our real self is independent of our empirical consciousness, which is just what we wish to have preserved, or, as seems more probable, the eternal existence which it enjoys is of an altogether ideal character, like that which Spinoza also attributed to the346 human soul, and which, in his philosophy, certainly had nothing to do with a prolongation of individual consciousness beyond the grave. As Madame de Sta?l observes of a similar view held at one time by Schelling, ��cette immortalit��-l�� ressemble terriblement �� la mort.�� And when, in addition to his own theory of individual ideas, we find Plotinus adopting the theory of the Stoics, that the whole course of mundane affairs periodically returns to its starting-point and is repeated in the same order as before,515 we cannot help concluding that human immortality in the popular sense must have seemed as impossible to him as it did to them. We must, therefore, suppose that the doctrine of metempsychosis and future retributions which he unquestionably professes, applies only to certain determinate cycles of psychic life; or that it was to him, what it had probably been to Plato, only a figurative way of expressing the essential unity of all souls, and the transcendent character of ethical distinctions.516