The Ascent of Man develops a comprehensive theory of human nature. James F. Harris sees human nature as an emergent property that supervenes a cluster of properties. Despite significant overlap between individuals that have human nature and those that are biologically human, the concept of human nature developed in this book is different. Whether biologically human or not, an individual may be said to possess human nature. This theory of human nature is called thecluster theory.Harris takes as his point of departurePlato's comment that in learning what a thing is we should look to the ways in which it acts upon or is acted upon by other things. He commits to a methodological naturalism and draws upon current views from the social and biological sciences. The cluster theory he develops represents one of the very few completely novel theories of human nature developed in the post-Darwin era. It will prove most useful in dealing with philosophical questions involving such contem
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