Charles Sanders Pierce (1839-1914). Founder of American pragmatism.
Relation to Sellars, habits, and rules
For Sellars, the word ‘habit’ denotes a mere regularity. For Pierce, habit is a normative concept.
He observes that the Latin form in which Newton lies down in Principia is the same form a notice board that says “Neckties will be worn in the office”.
Sellars would call this notion of normativity “ought-to-be”.