Speculative grammar is a branch of logic developed by Charles S. Peirce. Logic is usually defined as the hearing of arguments and inference. But Peirce perceives that this study is only part of logic, part of what he calls critique.
In addition to critique, the task of logicians concerns the study of the processes and forms of meanings, on the one hand, and the study itself, on the other.
Speculative grammar is the name of the study of the processes and forms of meaning, that is, of sign action (semiosis) and sign functions; speculative rhetoric or methodeutic is the name of research theory.
