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my early papers I limited logic to the study of this problem.
But since then, I have formed the opinion that the proper sphere
of any science in a given stage of development of science
is the study of such questions as one social group
of men can properly devote their lives to answering; and it seems
to me that in the present state of our knowledge of signs, the whole
doctrine of the classification of signs and of what is essential to a given kind of sign, must be
studied by one group of investigators. Therefore, I extend logic to
embrace all the necessary principles of semeiotic, and I
recognize a logic of icons, and a logic of indices as well
as a logic of symbols; and in this last I recognize three
divisions: Stecheotic (or stoicheiology), which I formerly called
Speculative Grammar; Critic, which I formerly called Logic; and
Methodeutic, which I formerly called Speculative Rhetoric. A fallacy