approximately as the German "Semiotik" and the French "Semiotique" are pronounced). In his later years, Peirce conceived semeiotic as composed of three parts: Speculative Grammar (basic definitions), Critic (theory of argumentation), and Methodeutic (theory of objective method). (For an extended discussion of these divisions, see Ketner 1987.) In his mature work, Peirce also declared that logic and semeiotic were identical, understanding by "logic" something much broader than its meaning today. Throughout this work, the words Logic and Semeiotic are regarded as interchangeable. This interchangeability has, in recent years, instigated some disorientation: logicians and contemporary practitioners of semiotics especially have tended to think of semeiotic as disconnected from Peirce's path-breaking researches as one of the founders of contemporary formal logic. This disorientation will disappear, however, if we consider that Peirce's semeiotic/logic had certain features that logicians and semeioticians today are beginning to appreciate and study, although sometimes under other names.

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