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and Gas Lighting in Buildings,” and Leeds and Butterfield one on “Acetylene.” A recent book in French by V. Trudelle treats “Lumiere Electrique et ses differentes Applications au Theatre.” Many books treat of photometry, power-plants, etc., but these are omitted because they deal with phases of light which have not been discussed in the present volume. “Light Energy,” by Cleaves, is a large volume devoted to light-therapy, germicidal action of radiant energy, etc. References to individual articles will often be found in the various indexes of publications.

THE END

INDEX

Aaron, 43

Accidents: 8;
street-lighting in relation to, 225 et seq.;
percentage (table) of, due to improper lighting, 231

Acetylene: 62;
light-yield of, 106, 107, 170, 187, 191

Actinic rays: effect of, upon human organism, 275

Africa, public lighting in ancient, 31

Agni, god of fire, 40

Air-pump, 130

Air-raids, 225

Alaska, 18, 29

Alchemy, 20

Aleutians, 18

Alexandria, 43, 163

Allylene, 106

Aluminum, 108, 179, 180

Amiens, Treaty of, 69

Amylene, 106

Aniline dyes, 106

Animal: distinction between, and human being, 3; 15;
  production of light, 24 et seq.;
  sources of light, 30, 31;
  oils, 51

Antimony, 294

Antioch, 153

Arago, 114, 196

Archbishop of Canterbury, 49

Archimedes, 19

Arc: lamps, 69, 89;
  electric, 111 et seq.;
  distinction between spark and, 112;
  Davy’s notes on electric, 113;
  formation of, 115, 116;
  Staite and enclosed, 117, 118;
  principle of enclosed, 118, 119;
  types of, 120;
  flame-, 121, 122;
  luminous, 122;
  electric, 127;
  luminous efficiency of electric (table), 124; 160 et seq.;
  -lamp in lighthouses, 168 et seq.;
  magnetite-, 187; 261