Again, while attacking the belief in human immortality, Epicurus seems to direct his blows against the metaphysical reasonings of Plato,153 as well as against the indistinct forebod77ings of primitive imagination. The consequences of this two-edged polemic are very remarkable. In reading Lucretius, we are surprised at the total absence of criticisms like those brought to bear on Greek mythology with such formidable effect, first by Plato and, long afterwards, by Lucian. There is a much more modern tone about his invectives, and they seem aimed at an enemy familiar to ourselves. One would suppose that the advent of Catholicism had been revealed in a prophetic vision to the poet, and that this, rather than the religion of his own times, was the object of his wrath and dread; or else that some child of the Renaissance was seeking for a freer utterance of his own revolt against all theology, under the disguise of a dead language and of a warfare with long-discredited gods. For this reason, Christians have always regarded him, with perfect justice, as a dangerous enemy; while rationalists of the fiercer type have accepted his splendid denunciations as the appropriate expression of their own most cherished feelings.
Third. The difference between what it costs to plan and construct machinery and what it will sell for, is generally as the amount of engineering knowledge and skill brought to bear in the processes of production.
ONE:Balmayne promptly collapsed into the chair that Beppo had put for him. He glanced in a white and agitated way round the room. There was not a friendly face to be seen anywhere. Given immunity from protection, and not one man there would have refused to cut his throat for a handful of coppers.291
THREE:I had expected it and believed the reports, but it hurt all the same. I had had intercourse with German soldiers almost exclusively; but that gave223 me a much better opportunity for observing their conduct, which roused in me a deep sympathy for the poor, oppressed Belgian people. That was why I was so sorry to hear of the fall of Antwerp, although I was not discouraged. Right would triumph, and the day come when the Belgian nation would shake off the foreign yoke of tyranny, and repair in peace and prosperity, under the sagacious rule of their king, what barbarians destroyed and pulled down."Looks like it!" said Balmayne. "You left here all right some time ago."
THREE:"Paste!" Maitrank cried, with a yell that rang through the building. "Paste, as I am a sinner. Deluded and fooled again. Rich as I am I would sacrifice every penny to be even with that woman."There goes the chute! Dick was equally thrilled.
[39]There is, however, a principle in hydraulic machinery that must be taken into account, in comparing it with positively geared mechanism, which often leads to loss of power that in many cases will overbalance any gain derived from the peculiar action of hydraulic apparatus. I allude to the loss of power incident to dealing with an inelastic medium, where the amount of force expended is constant, regardless of the resistance offered. A hydraulic crane, for instance, consumes power in proportion to its movements, and not as the amount of duty performed; it takes the same quantity of water to fill the cylinders of such cranes, whether the water exert much or little force in moving the pistons. The difference between employing elastic mediums like air and steam, and an inelastic medium like water, for transmitting force in performing irregular duty, has been already alluded to, and forms a very interesting study for a student in mechanics, leading, as it does, to the solution of many problems concerning the use and effect of power.It seems strange that Galileo, having gone so far, did not go a step further, and perceive that the planetary orbits, being curvilinear, must result from the combination of a centripetal with a tangential force. But the truth is that he never seems to have grasped his own law of inertia in its full generality. He understood that the planets could not have been set in motion without a rectilinear impulse; but his idea was that this impulse continued only so long as was necessary in order to give them their present velocity, instead of acting on them for ever as a tangential force. The explanation of this strange inconsequence must be sought in a survival of Aristotelian conceptions, in the persistent belief that rectilinear motion was necessarily limited and temporary, while circular motion was natural, perfect, and eternal.548 Now such conceptions as386 Nature, perfection, and eternity always rebel against an analysis of the phenomena wherein they are supposed to reside. The same prejudice will explain why Galileo should have so persistently ignored Keplers Laws, for we can hardly imagine that they were not brought under his notice.These reflections are offered, not in excuse but in explanation of Athenian intolerance, a phenomenon for the rest unparalleled in ancient Greece. We cannot say that men were then, or ever have been, logically obliged to choose between atheism and superstition. If instead of using Nous as a half-contemptuous nickname for the Clazomenian stranger,D his contemporaries had taken the trouble to understand what Nous really meant, they might have found in it the possibility of a deep religious significance; they might have identified it with all that was best and purest in their own guardian goddess Athn; have recognised it as the very foundation of their own most characteristic excellences. But vast spiritual revolutions are not so easily accomplished; and when, before the lapse of many years, Nous was again presented to the Athenian people, this time actually personified as an Athenian citizen, it was again misunderstood, again rejected, and became the occasion for a display of the same persecuting spirit, unhappily pushed to a more fatal extreme.
