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And just as geometers for the sake of their art make use of many devices which they themselves cannot describe nor find in the nature of things, even so the mechanician makes use of certain abstract and general terms, imagining in bodies force, action, attraction, solicitation, etc., which are of first utility for theories and formulations, as also for com- putations about motion, even if in the truth of things, and in bodies actually existing, they would be looked for in vain, just like the geometers’ fictions made by mathematical abstraction.
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