1999, Mark Olssen, Michel Foucault: Materialism and Education (page 58)Foucault recognizes that different forms of categorization are based on different forms of kindhood.
2008, Paul E. Griffiths, What Emotions Really Are (page 202)Biological taxa and chemical elements have been the twin paradigms of natural kinds, and it has often been assumed that the kindhood of biological taxa must be just like the kindhood of chemical elements.
