Jeff, To be iconic, a notation must have some resemblance to the structure or image of which it is an icon. Any claim that some notation is iconic must be justified by showing the original which it resembles. JBD> As far as I can see, the scroll is a special kind of iconic sign because it expresses the continuity in the relationship between antecedent and consequent of the conditional, and this mirrors the continuity in the relationship between premisses and conclusions in an argument. During the month of June 1911, Peirce was reviewing and reorganizing his logical, philosophical, and semiotic foundations for EGs. He had several goals, one of which was a clear and precise summary for his most receptive audience, Lady Welby and her significs group. On May 25 (R669), Peirce began with a summary of his writings since 1896. For that purpose, the scroll was significant, since it was his inspiration for switching from entitative to existential graphs.. But in June 7 to 17 (R670), he remembered that the rules of inference depended only on whether an area was positive or negative. "It is only the color of the area itself which has the force of affirming, if it be white or evenly enclosed... or of denying if it be shaded or oddly enclosed." He said that a cut was just the boundary of an area, and it had no more meaning than punctuation. He also showed a scroll in Fig 10 as an alternate way of representing the shading in Fig 11. In fact, he did not use the word 'scroll' to describe Fig 10. He just wrote "the lines that represent the cuts". Apparently, he considered the word 'scroll' to be so meaningless that it was not worth mentioning. In L231 (June22), he adopted pencil shading, which was easy to draw. Therefore, he had no need to draw or mention cuts or scrolls. The words would be useless verbiage that could only cause confusion. But L231 also mentioned steroscopic moving images. Shaded areas could easily be generalized to shaded regions in 3D. Cuts might be represented as closed regions, but there is no convenient way to represent a 3-D analog of a scroll. Shaded and unshaded regions are iconic notations, but there is no way to represent a 3-D scroll. Therefore, he did not mention cuts or scrolls in L231. John
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