13. This phrase is obscure: “. . . les affections involontaires qu’elles nous font éprouver, comparées avec la détermination volontaire qui préside à nos idées refléchies, et qui n’opère que sur nos sensations mêmes: . . .” It is clarified in d’Alembert’s article “Corpsuscle,” Encyclopédie, IV, 262, where he says proof of the existence of matter (bodies) is based “on the involuntary effects which they produce in us compared with our voluntary reflections on these same sensations.”

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