 There is, of course, good work on the final typology (see (Burks and Weiss 1949), (Sanders 1970), (Savan 1988), (Jappy 1989), (Jappy 2017), (Short 2007), (Muller 1994), and (Farias and Queiroz 2003) for the best of this work), but ultimately, it is not clear that any account will overcome the problems posed by the incomplete and cursory nature of the final account. Indeed, it is not clear that Peirce himself was fully at ease with his final typology and how its elements should hang together. As he himself said: