"Mashaw has taken . . . the Social Security Administration's handling of disability claims . . . and from it has drawn, not only a microsopic account and appraisal of SSA's methods and problems, but also a generalized and philosophic inquiry into the nature of the 'justice' such an agency, bureaucratically organized, can dispense. He provides an unorthodox redefinition of what the administrative law that matters is, and fresh insights inot why it...