Book reviews in this article:The Pentagonists.By A. ERNEST FITZGERALDThe Ring of Power: The White House Staff and Its Expanding Role in Government, By BRADLEY H. PATTERSON, Jr.The Politics of the U.S. Cabinet: Representation in the Executive Branch 1789–1984.By JEFFREY E. COHEN.Comparing Public Bureaucracies: Problems of Theory and Method.By B. GUY PETERS.Pathways to Power: Selecting Rulers in Pluralist Democracies.Edited by MATTEI DOGAN.Policy Studies: Integration and Evaluation.By STUART S. NAGE