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Published online by Cambridge University Press: 01 April 2022
This paper is a descendent of one I read at the 1982 Eastern APA symposium on species, commenting on an ancestor of Philip Kitcher's present paper. I thank Philip Kitcher for stimulating discussion, which helped create the selection pressure that guided the evolution of the ancestral paper into the present descendent. I also am grateful to the Graduate School of the University of Wisconsin, Madison for financial support in the form of a Romnes Faculty Fellowship.