XX LIGHT AND HEALTH 269 XXI MODIFYING ARTIFICIAL LIGHT 284 XXII SPECTACULAR LIGHTING 298 XXIII THE EXPRESSIVENESS OF LIGHT 310 XXIV LIGHTING THE HOME 325 XXV LIGHTING--A FINE ART? 341 READING REFERENCES 357 INDEX 359 LIST OF ILLUSTRATIONS Light and Liberty _Frontispiece_ FACING PAGE Primitive fire-baskets 16 Crude splinter-holders 16 Early open-flame oil and grease lamps 17 A typical metal multiple-wick open-flame oil-lamp 32 A group of oil-lamps of two centuries ago 33 Lamps of a century or two ago 56 Elaborate fixtures of the age of candles 57 Flame arc 128 Direct current arc 128 On the testing-racks of the manufacturer of incandescent filament lamps 129 Carbon-dioxide tube for accurate color-matching 160 The Moore nitrogen tube 160 Modern street lighting 161 A completed lighthouse lens 176 Torro Point Lighthouse, Panama Canal 176 American search-light position on Western Front in 1919 177 American standard field search-light and power unit 177 Signal-light for airplane 232 Trench light-signaling outfit 232 Aviation field light-signal projector 232 Signal search-light for airplane 232 Unsafe, unproductive lighting worthy of the dark ages 233 The same factory made safe, cheerful, and more productive by modern lighting 233 Locomotive electric headlight 240 Search-light on a fire-boat 240 Building ships under artificial light at Hog Island Shipyard 241 Artificial light in photography 256 Sterilizing water with radiant energy from quartz mercury-arcs 257 Judging color under artificial daylight 272 Artificial daylight 273 Fireworks and illuminated battle-fleet at Hudson-Fulton Celebration 288 Fireworks exhibition on May Day at Panama-Pacific Exposition 289