The history, workings, and development of windmills are respectably reviewed by the Browns, who describe early types in the Eastern and Western worlds; trace the windmills' spread through Europe and their evolution as new inventions eased the miller's task; explain their heaviest use in Holland, ""the nation that windmills built""; and point to variations in America where conditions demanded different solutions. The Browns end with a look at current and projected small and large-scale experiments with wind generators, increasingly attractive as fossil-fuel supplies dwindle. A satisfactory addition, but dull compared to Dennis' lively, intelligent coverage of the same material in last year's Catch the Wind.