The Logical Structure of Kinds

Book excerpt: Eric Funkhouser uncovers a logical structure that is common to many, if not all, classificatory systems or taxonomies. Every conceptual scheme--including the sciences, mathematics, and ethics--classifies things into kinds. Given their ubiquity across theoretical contexts, we would benefit from understanding the nature of such kinds. Significantly, most conceptual schemes posit kinds that vary in their degree of specificity. Species-genus taxonomiesprovide us with familiar examples, with the species classification being more specific than the genus classification. This book instead focuses on adjectival kinds--classifications picked out by kind-terms like'mass', 'shape', or 'belief', to give but a few examples. One of its fundamental claims is that studying the determination relation provides deep insight into the essences of adjectival kinds and their instances (properties). The determination relation is found to contain two components, which are employed to structure kinds at the same level of abstraction into property spaces. In turn, these property space models lead to a theory for individuating properties, which has profound consequenceswhen it comes to reduction, autonomy, and causation. Funkhouser argues that determination and realization are mutually exclusive relations. He defends the claim that multiple realizability entailsvarious senses of autonomy from various reductionist challenges. These theories of determination and realization ultimately provide general standards for establishing the autonomy of the special sciences or, conversely, their reduction.