ONE:Movements and strains may be called two of the leading conditions upon which designs for machines are based: movements determine general dimensions, and strains determine the proportions and sizes of particular parts. Movement and strain together determine the nature and area of bearings or bearing surfaces.It must further be noted that disbelief in a future life, as a philosophical principle, was not confined to the Epicureans. All philosophers except the Platonists and Pythagoreans were materialists; and no logical thinker who had once applied his mind to the subject could accept such an absurdity as the everlasting duration of a complex corporeal substance, whether consisting of gaseous or of fiery matter. A majority of the Stoics allowed the soul to continue its individual existence until, in common with the whole world, it should be reabsorbed into the elemental fire; but others looked forward to a more speedy extinction, without ceasing on that account to consider themselves orthodox members of the school. Of these the most remarkable instance is Marcus Aurelius. The great emperor was not blind to what seemed the enormous injustice of death, and did not quite see his way to reconciling it with the Stoic belief in a beneficent providence; but the difficulty of finding room for so many ghosts, and perhaps also the Heracleitean dogma of perpetual transformation, led him to renounce whatever hope he may at one time have cherished of entering on a new existence in some better world.359 A similar consequence was involved in the principles of the Peripatetic philosophy; and Alexander of Aphrodisias, the famous Aristotelian commentator, who flourished about 200 A.D., affirms the perishable nature of the soul on his own account, and, with perfect justice, attributes the same belief to Aristotle himself.360
TWO:61Plotinus possessed a remarkable power of reading the characters and even the thoughts of those about him. It is said, probably with some exaggeration, that he predicted the future fate of all the boys placed under his care. Thus he foretold that a certain Polemo, in whom he took particular interest, would devote himself to love and die young; which proved only too true, and may well have been anticipated by a good observer without the exercise of any supernatural prescience. As another instance of his penetration, we are told that a valuable necklace having been stolen from a widow named Chione, who lived in his house with her family, the slaves were all led into the presence of Plotinus that he might single out the thief. After a careful scrutiny, the philosopher put his finger on the guilty individual. The man at first protested his innocence, but was soon induced by277 an application of the whip to confess, and, what was a much more valuable verification of his accusers insight, to restore the missing article. Porphyry himself could testify from personal experience to his friends remarkable power of penetration. Being once about to commit suicide, Plotinus divined his intention, and told him that it proceeded, not from a rational resolution, but from a fit of the blues, as a remedy for which he prescribed change of scene, and this did in fact have the desired effect.414
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