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THREE:That Philo��s interpretation of Platonism ultimately reacted on Greek thought seems certain, but at what date his influence began to tell, and how far it reached, must remain undecided. Plutarch speaks of God��s purity and of his transcendent elevation above the universe in language closely resembling that of the Alexandrian Jew, with whose opinions he may have been indirectly acquainted.400 We have already seen how the daemons were employed to fill up the interval thus created, and what serious concessions to popular superstition the belief in their activity involved. Still Plutarch259 does not go so far as to say that the world was not created by God. This step was taken by Numenius, a philosopher who flourished about the middle of the second century, and who represents the complete identification of Platonism with Pythagoreanism, already mentioned as characteristic of the period following that date. Numenius is acquainted with Philo��s speculations, and accepts his derivation of Platonism from the Pentateuch. ��What,�� he asks, ��is Plato but a Moses writing in the Attic dialect?��401 He also accepts the theory that the world was created by a single intermediate agent, whom, however, he credits with a much more distinct and independent personality than Philo could see his way to admitting. And he regards the human soul as a fallen spirit whose life on earth is the consequence of its own sinful desires. From such fancies there was but a single step to the more thorough-going dualism which looks on the material world as entirely evil, and as the creation of a blind or malevolent power. This step had already been taken by Gnosticism. The system so called summed up in itself, more completely, perhaps, than any other, all the convergent or conflicting ideas of the age. Greek mythology and Greek philosophy, Zoroastrianism, Judaism, and Christianity each contributed an element to the fantastic and complicated scheme propounded by its last great representative, Valentinus. This teacher pitches his conception of the supreme God even higher than Philo, and places him, like Plato��s absolute Good, outside the sphere of being. From him��or it��as from a bottomless gulf proceed a vast series of emanations ending in the Demiurgus or creator of the visible world, whose action is described, in language vividly recalling the speculations of certain modern metaphysicians, as an enormous blunder. For, according to Gnosticism, the world is not merely infected with evil by participation in a material principle, it is evil altogether, and a special intervention of260 the higher powers is needed in order to undo the work of its delirious author.402 Here we have a particular side of Plato��s philosophy exaggerated and distorted by contact with Zoroastrian dualism. In the Statesman there is a mythical description of two alternate cycles, in one of which the world is governed by a wise providence, while in the other things are abandoned to themselves, and move in a direction the reverse of that originally imposed on them. It is in the latter cycle that Plato supposes us to be moving at present.403 Again, after having been long content to explain the origin of evil by the resistance of inert matter to the informing power of ideal goodness, Plato goes a step further in his latest work, the Laws, and hazards the hypothesis of an evil soul actively counterworking the beneficent designs of God.404 And we find the same idea subsequently taken up by Plutarch, who sees in it the most efficient means for exonerating God from all share in the responsibility for physical disorder and moral wrong.405 But both master and disciple restricted the influence of their supposed evil soul within very narrow limits, and they would have repudiated with horror such a notion as that the whole visible world is a product of folly or of sin.The relation between the feeding and cutting motion of reciprocating machines is not generally considered, and forms an interesting problem for investigation. FORE:Although a system but recently developed, the employment of hydraulic machinery for transmitting and applying power has reached an extended application to a variety of purposes, and gives promise of a still more extensive use in future. Considered as a means of transmitting regularly a constant amount [54] of power, water apparatus is more expensive and inferior in many respects to belts or shafts, and its use must be traced to some special principle involved which adapts hydraulic apparatus to the performance of certain duties. This principle will be found to consist in storing up power in such a manner that it may be used with great force at intervals; and secondly, in the facilities afforded for multiplying force by such simple mechanism as pumps. An engine of ten-horse-power, connected with machinery by hydraulic apparatus, may provide for a force equal to one hundred horse-power for one-tenth part of the time, the power being stored up by accumulators in the interval; or in other words, the motive power acting continuously can be accumulated and applied at intervals as it may be required for raising weights, operating punches, compressive forging, or other work of an intermittent character. Hydraulic machinery employed for such purposes is more simple and inexpensive than gearing and shafts, especially in the application of a great force acting for a considerable distance, and where a cylinder and piston represent a degree of strength which could not be attained with twice the amount of detail, if gearing, screws, levers, or other devices were employed instead.