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and, to draw an example from the Microcosm the human body as a small world, that which writers on optics have granted to the eyes? They treated natural things mathematically so that their knowledge might be more distinct; and the very structure of muscles demands, by a certain necessity, that they be explained mathematically. But why do I claim for muscles things that are owed to the entire body? Our body is an organ composed of a thousand organs; and he who believes that its true knowledge can be investigated without the help of Mathematics original: "Matheseos" must believe that matter exists without extension and a body without form. Nor is there any other source of the countless errors by which the history of the human body is foully polluted than the fact that Anatomy original: "Anatome" has hitherto disdained the laws of Mathematics. For while it did not acknowledge the rule of a legitimate prince, and administered everything according to its own—not to say blind—arbitration, it foisted upon us doubts for certainties, falsehoods for truths, and unknown things for known; and thus it finally brought the matter to such a point that nothing has remained more unknown to man than man himself. How