Jon AS, All your citations are prior to R670, which demotes the scroll to nothing but a way of drawing two ovals (negations) without raising the pen. In R670, Peirce states the three primitives: existence, conjunction, and negation. And in L231, he drops the adjective 'illative' in front of the three permissions (rules of inference). All three of them are stated in terms of negations, and none of them mention or depend on the scroll in any way. Furthermore, the meaning of any general is determined by its implications for the future. Please read the slides that introduce EGs to beginners (and advanced students who learned the algebraic notations for logic): http://jfsowa.com/talks/egintro.pdf . The first ten slides are a basic intro. But slides 11 and 12 state why the scroll (or any other symbol for if-then) is not a primitive or necessary for deduction. The remaining slides show how Peirce's 1911 EGs are a major *improvement* on the mainstream logics of the 20th century and why they are an important foundation for the future. As Peirce said explicitly in Sept. and Dec. 1911, the 1906 version was as bad as it could be. Unless you can find any quotation after June 1911 where he uses the words 'illation' or 'illative' or deviates from his 1911 EGs, I consider the case to be closed. John
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