Muhammad Ali Khalidi
Department of Philosophy and Cognitive Science Program
Boyd, R. : ‘Kinds, Complexity, and Multiple Realization’, Philosophical Studies, 95, pp. 67–98.
Hacking, I. : ‘Natural Kinds: Rosy Dawn, Scholastic Twilight’, Royal Institute of Philosophy Supplement, 61, pp. 203–39.
Khalidi, M. A. : Natural Categories and Human Kinds, Cambridge: Cambridge University Press.
 See, for example, (Hacking ).
 Boyd (, p. 69) writes that there is a ‘fit or accommodation between natural kind categories and induction-supporting causal powers of things’.
 Compare, for example, (Khalidi ).
 A private allele is one that is found in just one population (here, the population of Native Americans) in a broader collection of populations.