Bring Me the Headnof John D.nby Philip N. MarcusnThe Politics of Knowledge: ThenCarnegie Corporation,nPhilanthropy, and Public Policynby Ellen Condliffe LagemannnMiddletown: Wesleyan UniversitynPress; 347 pp., $35.00nCharity Begins at Home:nGenerosity and Self-interestnAmong the Philanthropic Elitenby Teresa OdendahlnNew York: Basic Books;n299 pp., $22.95nSn