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TWO:Planing machines of the most improved construction are driven by two belts instead of one, and many mechanical expedients have been adopted to move the belts differentially, so that both should not be on the driving pulley at the same time, but move one before the other in alternate order. This is easily attained by simply arranging the two belts with the distance between them equal to one and one-half or one and three-fourth times the width of the driving pulley. The effect is the same as that accomplished by differential shifting gearing, with the advantage of permitting an adjustment of the relative movement of the belts. THREE:The profit reaped by Aristotle from the connexion seems equally doubtful. Tradition tells us that enormous sums of money were spent in aid of his scientific researches, and a whole army of crown servants deputed to collect information287 bearing on his zoological studies. Modern explorations, however, have proved that the conquests of Alexander, at least, did not, as has been pretended, supply him with any new specimens; nor does the knowledge contained in his extant treatises exceed what could be obtained either by his own observations or by private enquiries. At the same time we may suppose that his services were handsomely rewarded, and that his official position at the Macedonian Court gave him numerous opportunities for conversing with the grooms, huntsmen, shepherds, fishermen, and others, from whom most of what he tells us about the habits of animals was learned. In connexion with the favour enjoyed by Aristotle, it must be mentioned as a fresh proof of his amiable character, that he obtained the restoration of Stageira, which had been ruthlessly destroyed by Philip, together with the other Greek cities of the Chalcidic peninsula.59 THREE:The poor wretches, who expected to be killed at any moment, were driven into squares or the meadows, where they were exposed to the chilly night air, so that several babies perished. Only the next morning were the women and children allowed to leave��that is to say, they were told to take the shortest way to Maastricht.The Epicurean cosmology need not delay us long. It is completely independent of the atomic theory, which had only been introduced to explain the indestructibility of matter, and, later on, the mechanism of sensation. In describing how the world was first formed, Epicurus falls back on the old Ionian meteorology. He assumes the existence of matter in different states of diffusion, and segregates fluid from solid, light from heavy, hot from cold, by the familiar device of a rapid vortical movement.168 For the rest, as we have already noticed, Epicurus gives an impartial welcome to the most conflicting theories of his predecessors, provided only that they dispense with the aid of supernatural intervention; as will87 be seen by the following summary, which we quote from Zeller:��