I am not sure if this helps. I cannot date it.
From CP:
620. But, because all inference may be reduced in some way to
Barbara, it does not follow that this is the most appropriate form in which
to represent every kind of inference. On the contrary, to show the
distinctive characters of different sorts of inference, they must clearly
be exhibited in different forms peculiar to each. Barbara particularly
typifies deductive reasoning; and so long as the is is taken literally, no
inductive reasoning can be put into this form. Barbara, is, in fact,
nothing but the application of a rule. The so-called major premiss lays
down this rule; as, for example, All men are mortal. The other or minor
premiss states a case under the rule; as, Enoch was a man. The conclusion
applies the rule to the case and states the result: Enoch is mortal. All
deduction is of this character; it is merely the application of general
rules to particular cases. Sometimes this is not very evident, as in the
following:
All quadrangles are figures,
But no triangle is a quadrangle;
Therefore, some figures are not triangles.
Peirce: CP 2.620 Cross-Ref:††
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On Wed, Oct 28, 2015 at 12:17 PM, Christina Da Silva <[email protected]>
wrote:
> I am finishing up a masters that focuses on Medieval Islamic philosophy,
> and this list has been an inestimably useful resource for me, so thank you
> to all who post here. I am now trying to find the source for some
> information I have in my notes, and my hope is that someone on the list can
> help me.
>
> Here is my question: where does Peirce suggest that all syllogisms may be
> reduced to Barbara, and where does he later renounce this idea?
>
> Thank you,
> Christina da Silva
>
>
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