vi PREFACE and includes COAL- AND ASH-HANDLING PLANT, RECIPROCATING- ENGINES, TURBINES, CONDENSING PLANT, and an article on the OPERATION OF LAND POWER PLANTS. In this last article the needs of power-station engineers have been kept more especially in view. This volume also contains a section on ENGINEERING CHEMISTRY. Volume VI is devoted to Internal-combustion Engines, and deals with GAS-ENGINES, OIL-ENGINES, MOTOR-CARS, AERO-ENGINES, GAS-PRODUCERS, the OPERATION OF OIL-ENGINES, and the OPERATION OF GAS-ENGINES. THE EDITORS. J!