Ideas from 'Two letters on mind' by René Descartes [1649], by Theme Structure

[found in 'Materialism and the Mind-Body Problem' (ed/tr Rosenthal,David M) [Prentice-Hall 1971,13-560177-0]].

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8. Modes of Existence / C. Powers and Dispositions / 2. Powers as Basic
Incorporeal substances are powers or forces
27. Natural Reality / B. Early Matter Theories / 7. Matter as Extension
Impenetrability only belongs to the essence of extension