38. In this rather confusing paragraph, d’Alembert is distinguishing between the faculty for thinking logically, which people have always had, and the formal discipline (Logic) that analyzes and makes explicit its rules. Logic is only one of the several meanings attached to the words “reason” and “reasoning” in the Enlightenment. The term “reason” came to apply to the entire method of analysis and synthesis described up to this point in the Discourse.

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