Contemporary discussions of political forms exhibit a concern with constitutional procedures and values seldom encountered in the history of political thought. The search for a parallel development would require a turning to the classical period of Greek and Roman philosophy and politics. In the light of contemporary constitutional self-consciousness, as well as of the sustained inquiry of the ancient world into the various forms of polity, pure and degraded, ideal and historical, the political analyses of the seventeenth and eighteenth centuries assume the character of politico-ideological crystallizations of the breakdown of the ancien regime. There are, of course, fundamental underlying differences between these three periods of political reflection. The ancient Greek analyses, although centering on Greek realities and problems, bear, prima facie, a style of detached theory intended to be taken as philosophy, no more, no less.