Since the mid-1980s, political scientists, in particular historical institutionalists, have employed evolutionary theory to study institutional stasis and change. More recently, there have been calls for 'taking evolution seriously'. This article will frame the earlier uses of evolutionary theory by historical institutionalists, and the recent calls for 'taking evolution seriously' into a hierarchy of levels of interaction between natural and social sciences. Put in this perspective, the earlier efforts can be seen as limiting the use of evolutionary theory at the lowest, metaphorical level. On the other hand, the recent calls are striving to advance political science's interaction with biological science to analogous and homologous levels, and even make it part of the larger project of generalizing Darwinism. These are noble scientific explorations. However, they should not lead to an impression that using evolutionary theory metaphorically is necessarily unserious.
Keywords: historical institutionalism; Darwinian evolutionary theory; interaction with natural sciencesCoincidentally or not, two separate articles written by political scientists, both containing the phrase 'Taking Evolution Seriously' in the main titles, have appeared in recent years in academic journals in different fields -one in biosciences (Theory in Biosciences) and the other in political science (Polity). The first article, by Orion Lewis and Sven Steinmo (2010), discusses the merits of switching the scientific foundation of political studies from Newtonian physics to Darwinian biology. The second article, by Ian Lustick (2011), argues that a Darwinian evolutionary perspective is particularly valuable for political studies whenever 'history matters'.Application of evolutionary perspective to political studies is in fact nothing new. As early as the mid-1980s, political scientists began to employ the evolutionary theory of punctuated equilibrium to analyze institutional stasis and change, leading to the emergence of historical institutionalism as a major research pillar of political science. Were these earlier applications of evolutionary theory by political scientists not serious enough? What do recent calls for 'taking evolution seriously' actually mean? In what direction are these calls pointing? To tackle these questions, this article will first frame the earlier uses of the evolutionary theory of punctuated equilibrium by historical institutionalists, and the recent calls for 'taking evolution seriously' into a hierarchy of levels of interaction between natural and social sciences, developed by the historian of science I. Bernard Cohen. Put under this philosophy of science perspective, the earlier efforts can be seen as limiting the use of evolutionary theory at the lowest, metaphorical, level. On the other