Jeff,
Your questions about Peirce's proof of pragmatitiicsm are important.
Jeff> I tend to think the later writings often build on the earlier. As
such, I wonder what the later proof borrows by way of premisses from the
arguments developed in the 1903 Harvard Lectures on Pragmatism. Once that
is clearer, we can then ask what might have been added to the later
argument by way of additional premisses.
Peirce's ideas were constantly evolving up to the very end. He frequently
went back to earlier ideas, but always with some new insights or directions
from his later developments. For pragmaticism, his 1903 Harvard and
Lowell lectures were an important starting point. And the word
'prolegomena' in 1906 is an important clue.
An interesting occurrence in December 1902: Carus published a new English
translation of Kant's "Prolegomena to any future metaphysics" and Peirce
published a notice of it in the Nation in June 1903. -- he must have been
reading (or rereading) it around the same time as he was preparing those
Lectures.
Peirce must have read it (in German) during the time that he and his father
were studying Kant. After Kant finished the first edition of KdrV (or CdrV
as Peirce preferred to refer to it), he wrote the short Prolegomena as an
intro and overview of the questions that he tried to answer in the first
edition of the K(C)drV. Those questions were the prelude to his second
edition, which he finished a few years later. Although Peirce had
criticized some of Kant's fundamental assumptions, he always had a high
regard for Kant, and he cited him frequently throughout CP. And he had a
very high regard for Kant's questions, which are the main topic of his own
Prolegomena. If you (a) read Kant's questions and (b) read Peirce's
writings from 1903 onwards, you can see a strong influence of Kant's
questions on Peirce. In fact, Peirce's 1903 classification of the sciences
seems to be part of Peirce's answers to K's three transcendental questions.
Even stronger evidence for Kant's influence is Peirce's 1906 Apology for
Pragmaticism, which is written as a prelude to a series of articles he
planned for the Monist. Unfortunately, he ran into difficulties around
1909, which led him to the series of ten MSS on "Assurance" (R661 to R670)
from 1910 to 1911.
There's much more to be said about all these issues. I recommend an
article about Peirce's Apology by Max Fisch (1982) and reprinted in a book
by Fisch in 1986. In that article, Max F. wrote that methodeutic is a key
topic that Peirce was addressing in his planned proof. I agree.
And I also believe that there were two reasons why Peirce stopped in 1909:
(1) problems with phaneroscopy as a science egg (R645) and (2) problems
with logic, which were the reason for his ten studies (R661 to R670) from
1910 to 1911. These are the reasons for major revisions that Peirce made
in 1911 and 1912. It's sad that he was converging on important new ideas
just when he had that accident in 1911 followed by the cancer.
There is, of course, much more to say about all these issues. And as Max
Fisch also said, that's why we need all of Peirce's late MSS available in
suitable formats. As Peirce's late letters show -- he was thinking very
hard about all these issues. And he didn't hesitate to make major
revisions when necessary.
John