A. MS., n.p., n.d., 199 pp.
Existential graphs, the logic of relatives, logical critic, theory of signs, hypothesis and induction, belief and reasoning, generalization, rationale of science, and classification are some of the topics found here. One page is dated September 22, 1860; the remainder are undated and apparently cover several periods of CSP’s career.
The entry in BibTeX format.
All signs are divided by the logicians into names, propositions, and argumentations. A mental name, or what one thinks when one thinks of the meaning of a name, is called a Concept.
…conduct is not mere action; it is rather action so far as it seeks one ultimate result as desirable and shun[s] another [as] undesirable.
…the Theory of the general conditions under which one representamen may produce another […] may be called Formal Rhetoric, or objective logic.
Hypothesis consists in the inference of a case from a rule & a result or from the denial of a rule & the denial of the result or the inference of the contradictory of a result from a rule & the denial of a case.
An argumentation within one’s own mind, by which the thinker is more or less inclined to believe something, or by which he sees that something must be true, is called an inference.
A mental proposition is called a judgment.