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Updated: May 19, 2025
He applied this geometrical and inventive genius to dioptrics, which, when treated of by him, became a new art. And if he was mistaken in some things, the reason of that is, a man who discovers a new tract of land cannot at once know all the properties of the soil. Those who come after him, and make these lands fruitful, are at least obliged to him for the discovery.
"Nothing passes from external objects to the soul except certain motions of matter (mouvemens corporels), but neither these motions, nor the figures which they produce, are conceived by us as they exist in the sensory organs, as I have fully explained in my "Dioptrics"; whence it follows that even the ideas of motion and of figures are innate (naturellement en nous). And,
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