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11 - Evolution, population thinking, and essentialism

Published online by Cambridge University Press:  14 January 2010

Elliott Sober
Affiliation:
University of Wisconsin, Madison
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Summary

INTRODUCTION

Philosophers have tended to discuss essentialism as if it were a global doctrine – a philosophy which, for some uniform reason, is to be adopted by all the sciences, or by none of them. Popper (1972) has taken a negative global view because he sees essentialism as a major obstacle to scientific rationality. And Quine (1953b, 1960), for a combination of semantical and epistemological reasons, likewise wishes to banish essentialism from the whole of scientific discourse. More recently, however, Putnam (1975) and Kripke (1972) have advocated essentialist doctrines and have claimed that it is the task of each science to investigate the essential properties of its constitutive nature kinds.

In contrast to these global viewpoints is a tradition which sees the theory of evolution as having some special relevance to essentialist doctrines within biology. Hull (1965) and Mayr (1959) are perhaps the two best known exponents of this attitude; they are local anti-essentialists. For Mayr, Darwin's hypothesis of evolution by natural selection was not simply a new theory, but a new kind of theory – one which discredited essentialist modes of thought within biology and replaced them with what Mayr has called “population thinking.” Mayr describes essentialism as holding that

… [t]here are a limited number of fixed, unchangeable “ideas” underlying the observed variability [in nature], with the eidos (idea) being the only thing that is fixed and real, while the observed variability has no more reality than the shadows of an object on a cave wall … [In contrast], the populationist stresses the uniqueness of everything in the organic world.… […]

Type
Chapter
Information
From a Biological Point of View
Essays in Evolutionary Philosophy
, pp. 201 - 232
Publisher: Cambridge University Press
Print publication year: 1994

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