Ideas from 'The World' by René Descartes [1631], by Theme Structure
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12. Knowledge Sources / B. Perception / 2. Qualities in Perception / d. Secondary qualities
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22593
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Our sensation of light may not be the same as what produces the sensation
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26. Natural Theory / A. Speculations on Nature / 6. Early Matter Theories / f. Ancient elements
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16569
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The Hot, Cold, Wet and Dry of the philosophers need themselves to be explained
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27. Natural Reality / A. Classical Physics / 1. Mechanics / b. Laws of motion
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20964
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Descartes said there was conservation of 'quantity of motion' [Papineau]
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