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THREE:"What do you think of that?" Prout asked.Sandy wanted to nudge his comrade, to warn him to be careful. There was no chance; the man was observing them intently. FORE:The obligations of justice come next. They are summed up in two precepts that leave nothing to be desired: the first is to do no harm except in self-defence; the second, to bear our share in a perpetual exchange of good offices. And the foundation of justice is rightly placed in the faithful fulfilment of contracts��an idea perhaps suggested by Epicurus.63 The virtue of fortitude is treated with similar breadth, and so interpreted as to cover the whole field of conduct, being identified not only with fearlessness in the face of danger, but with the energetic performance of every duty. In a word, it is opposed quite as much to slothfulness and irresolution as to physical timidity.64 Temperance preserves its old meaning of a reasonable restraint exercised over the animal passions and desires; and furthermore, it receives a very rich significance as the quality by which we are enabled to discern and act up to the part assigned to us in life by natural endowment, social position, and individual choice. But this, as one of the most important ideas contributed by Stoicism to subsequent thought, must be reserved for separate discussion in the following section.

THREE:Opposed to the maintenance of standard dimensions are the variations in size due to temperature. This difficulty applies alike to gauging implements and to parts that are to be tested; yet in this, as in nearly every phenomenon connected with matter, we have succeeded in turning it to some useful purpose. Bands of iron, such as the tires of wheels when heated, can be 'shrunk' on, and a compressive force and security attained, which would be impossible by forcing the parts together both at the same temperature. Shrinking has, however, been almost entirely abandoned for such joints as can be accurately fitted. FORE:

THREE:We have now to see how, granting Epicurus his conception of painlessness as the supreme good, he proceeds to evolve from it a whole ethical, theological, and physical system. For reasons already mentioned, the ethical development must be studied first. We shall therefore begin with an analysis of the particular virtues. Temperance, as the great self-regarding duty, obviously takes precedence of the others. In dealing with this branch of his subject, there was nothing to prevent Epicurus from profiting by the labours of his predecessors, and more especially of the naturalistic school from Prodicus down. So far as moderation is concerned, there need be little difference between a theory of conduct based exclusively on the interests of the individual, and a theory which regards him chiefly as a portion of some larger whole. Accordingly, we find that our philosopher, in his praises of frugality, closely approximated to the Cynic and Stoic standards��so much so, indeed, that his expressions on the subject are repeatedly quoted by Seneca as the best that could be found. Perhaps the Roman moralist valued them less for their own sake than as being, to some extent, the admissions of an opponent. But, in truth, he was only reclaiming what the principles of his own sect had originally inspired. To be content with the barest necessaries was a part of that Nature-worship against which Greek humanism, with its hedonistic and idealistic offshoots, had begun by vigorously protesting. Hence many passages in Lucretius express exactly the same sentiments as those which are most characteristic of Latin literature at a time when it is completely dominated by Stoic influences. FORE:The following are suggested as subjects which may be studied in connection with lathes and turning: the rate of cutting movement on iron, steel, and brass; the relative speed of the belt cones, whether the changes are by a true ascending scale from the slowest; the rate of feed at different changes estimated like the threads of a screw at so many cuts per inch; the proportions of cone or step pulleys to insure a uniform belt tension, the theory of the following rest as employed in turning flexible pieces, the difference between having three or four bearing points for centre or following rests; the best means of testing the truth of a lathe. All these matters and many more are subjects not only of interest but of use in learning lathe manipulation, and their study will lead to a logical method of dealing with problems which will continually arise.It was Hetty who came back with the second message that the Countess would see her visitor presently in her dressing-room. The girl started as she recognized the features of the detective.