A half century of controversy over the treatment of depreciation in railroad and public utility regulation culminated in a decade of storm and fury, ending in the late ′30s. The appearance of a new book on depreciation two decades later is indeed newsworthy. It is a somewhat nostalgic, as well as a gratifying, picture of a champion reviewing the old battles, overlooking some of the intermediate victories and defeats, and ungrudgingly accepting the new order of things.