When developing phylogenetic systematics, the entomologist Willi Hennig adopted elements from Nicolai Hartmann’s ontology. In this historical essay I take on the task of documenting this adoption. I argue that in order to build a metaphysical foundation for phylogenetic systematics, Hennig adopted from Hartmann four main metaphysical theses. These are (1) that what is real is what is temporal; (2) that the criterion of individuality is to have duration; (3) that species are supra-individuals; and (4) that there are levels of (...) reality, each of which may be subject to different kinds of law. Reliance on Hartmann’s metaphysics allowed Hennig to ground some of the main theoretical principles of phylogenetic systematics, namely that the biological categories—from the semaphoront to the highest rank—have reality and individuality despite not being universals, and that they form a hierarchy of levels, each of which may require different kinds of explanation. Hartmann’s metaphysics thereby provided a philosophical justification for Hennig’s phylogenetic systematics, both as a theory and as a method of classification. (shrink)

I proceed from the hypothesis that the difficulties in Kant’s presentation of his plan and, accordingly, the implicit reason for the critical attitude to this plan on the part of many contemporary philosophers stem from the fact that he had no theoretical link at his disposal which would offer a more solid scientific grounding for his entire system. I believe that Darwinism is such a link which bolsters the central but ungrounded thesis of the Critique of Pure Reason on the (...) existence of a priori synthetic judgments. The synthesis of Darwinism and critical philosophy dictates, however, a substantial restructuring of the latter since some of its key elements prove to be weak in the light of modern studies and need to be revised or even reversed. The first reversal explored in this article determines the origin of the categories which are now revealed not “from the top down” where Kant sought them, i. e. not in logical functions in accordance with metaphysical deduction and not in self-consciousness as transcendental deduction claims, but “from the bottom up” if one considers things in the evolutionary dimension, i. e. in the instincts. The second reversal shifts the freedom of will which Kant placed in the same ontological basket with things in themselves at “the top,” to another level of the pyramid of ontologies, by changing dualism to pluralism because dualism is too narrow to accommodate all the autonomous components of critical philosophy. Thus spirit and freedom find a new place separate from the sphere of physical nature; the category of adaptation explains how different ontologies can coexist; while the problem of two interpretations of transcendental idealism (two-world vs. two-aspect interpretation) finds a solution through their reconciliation. (shrink)

The paper presents color as a case study for the analysis of phenomena that pertain to several levels of reality and are typically framed by different sciences and disciplines. Color, in fact, is studied by physics, biology, phenomenology, and esthetics, among others. Our thesis is that color is a different entity for each level of reality, and that for this reason color generates different observables in the epistemologies of the different sciences. By analyzing color as a paradigmatic case of an (...) entity naturally spreading over different levels of reality, the paper raises the question as to whether making explicit the usually implicit ontological assumptions embedded within the different observables exploited by the different sciences may eventually clarify some of the difficulties of developing a comprehensive theory of color. (shrink)

This article examines the connections among heuristics, the epistemological and ontological presuppositions that underlie theorizing, and substantive explanations in sociology. It develops and contrasts three heuristics: “doing as knowing” (DK), “categorizing as knowing” (CK), and “praxis as knowing” (PK). These are each composed of four dimensions: the theory of knowledge, the theory of reality, the theory of the growth of knowledge, and the theory of knowledge producers. The article then shows the importance of heuristics for empirical work by demonstrating how (...) they shape explanations in the sociological subfield of the historical sociology of knowledge. The essay draws two main conclusions: it argues that PK offers a more useful basis for developing explanations in sociology than either of the two alternatives (DK and CK) that currently shape substantive work; furthermore, it claims that the exposition of heuristic assumptions is an important task for sociology. (shrink)