Published online by Cambridge University Press: 01 April 2022
Essentialism—understood as the doctrine that there are natural kinds—can be sustained with respect to the most fundamental physical entities of the world, as I elsewhere argue. In this paper I take up the question of the existence of natural kinds among complex structures built out of these elementary ones. I consider a number of objections to essentialism, in particular Locke's puzzle about the existence of borderline cases. A number of recent attempts to justify biological taxonomy are critically examined. I conclude that theory partially justifies such taxonomies but supports only a weaker form of essentialism.
I should like to thank the two anonymous referees whose criticisms were extremely helpful.