In this two-part essay I develop a theory of natural signs. Since even primordial signs signify values, in the first part I develop the theory’s valuative aspect. Goods are as primary in nature as facts are, and together facts and values generate semeiosis in all life without excess extrapolation from human psychology. To ward off over-extrapolating on values, I defend a major discontinuity between man and nature on the goods of ethics. In the essay’s second part I develop the semeiotic (...) dimensions of the negative feedback model of purposive systems. I provide tests for the truth and falsity of the primitive representations in these systems. I account for the holism of representational systems and their non-extensionality, and I define functions. I solve this important definitional problem by inverting the usual mode of thinking: Functions do not explain signs; signs explain functions. Finally I defend this theory’s way of understanding the continuity between human beings and the rest of living nature against several criticisms. (shrink)

‘Ifs’ come washed or unwashed. The washed ifs are embedded in precise theories: the constantly strict implication of deductive inference, the variably strict implication of ‘nearness’ conditionals, and statements of conditional probability. By a nearness conditional I mean the common part of Stalnaker's and D. Lewis's theory of counterfactual conditionals, which depends on a notion that possible worlds are more or less near to each other, as a measure of their over-all similarity to each other.

According to philosophical naturalism, the main anti-naturalism in philosophy derives from Kant and depends on transcendental arguments, which are invalid or polemically toothless. Many of naturalism's characteristic features follow from this repudiation of Kantian method. Anti-naturalists should be aware that the rationale for naturalism depends on this attack on their own position. There remains for philosophy a distinctively philosophical role that depends on the indexical element in our thought, the role of elaborating a scientific worldview.