CHAPTER		PAGE
I	Light and Progress	[3]
II	The Art of Making Fire	[15]
III	Primitive Light-Sources	[24]
IV	The Ceremonial Use of Light	[38]
V	Oil-Lamps of the Nineteenth Century	[51]
VI	Early Gas-Lighting	[63]
VII	The Science of Light-Production	[80]
VIII	Modern Gas-Lighting	[97]
IX	The Electric Arcs	[111]
X	The Electric Incandescent Filament Lamps	[127]
XI	The Light of the Future	[143]
XII	Lighting the Streets	[152]
XIII	Lighthouses	[163]
XIV	Artificial Light in Warfare	[178]
XV	Signaling	[194]
XVI	The Cost of Light	[208]
XVII	Light and Safety	[225]
XVIII	The Cost of Living	[238]
XIX	Artificial Light and Chemistry	[256]
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]
[The new flood lighting contrasted with the old outline lighting]	[304]
[Niagara Falls flooded with light]	[305]
[Artificial light honoring those who fell and those who returned]	[320]
[The expressiveness of light in churches]	[321]
[Obtaining two different moods in a room by a portable lamp which supplies direct and indirect components of light]	[336]
[The lights of New York City]	[337]
[Artificial light in community affairs]	[352]
[Panama-Pacific Exposition]	[353]

CONTENTS

LIST OF ILLUSTRATIONS

ARTIFICIAL LIGHT

I

LIGHT AND PROGRESS