235, 2S6, 250, 251, 271Oxalic Acid, igo.

Particulate Clouds, 140, 232. Patent Policy, German, x91. Penetrants, 29. Persistent lethal substance, 225227, 229, 231. -substances, 29, 29. Phenol, German cornering of, 194. Phenylca rbyl amine chloride, 158. Phosgene, 25, 29, 64, 69, 124,141, 156, z67, 217, 230, 249. 4,delayed action," 45, 53French development of, T 70 German cloud, 44-46. Phosphorus, r75, 181-

Photographic chemicals, 189, 203. Physiological classification, 25.
Poison gas, 25, 1507 151. Porton, experimental station, 97,

110`. Portuguese front, attack on, 77. Potassium permanganate, 126, 2M Price cutting policy, German, 189, 213. Production, 83, 149, 162, 163, 249, 250. critical importance of, 143Y 144, 171, 26o. statistics, 82, 83, 88. Projector, German development Of, 70) 711. -Livens, see Livens Projector. -short range, 182. Propaganda by German dye agents, igr. -,German use of, 113. Protection, 38, 90, 92, 95, 99, loop 109, 113p 114) 121, 124~ 125, 127~ 128, 176, 216, 217, 220, 221. -collective, 231, 233. -future deinclopmentS, 231. -Individual, 231, 232. -of animals, 92. Prussic acid, 26, ixS. Puteaux, American laboratory, 175, 21S.

Rechicourt, attack on French, 7(RedCross appeal toendwar, i ig. Research, 35,85, 108Y176,184,249. Respirator, Box, see Box Respirator. -drurns, 97.—XTXY 13 5. Rhincland occupation, Allied, 206. 279 Index

Royal Society, 50, 94-97. Rubber, German shortage of, x32.
Russia, gas attacks against, 47, 123p 124.

St. Mihiel Battle, z82. Salicylic acid, igg, x94, igg.
Salvarsan, igg. Scientific Advisory Committee, 499 95, 96.
Serni-Circular Canals, 2x5. Sensitisers, photographic, 203.
Service Chemique de Guerre, ioS. Shell, Gas, 30, 40, 41, 64., 136,

A3, 216.

-Falkenhayn's orders,+3.—percentage Of, 77, 79, 80, 141, 245. Smoke, future importance of, ISO, 181, 2A. -use with lethal gases, i40, 180. Somme offensive, 52,55, 6r, 64,143. Speculative element, 2115, 220. Special Brigade R.E., 52, x74. -Companies, 50, 93. Sternutatory compounds, a6, 28, 41. Stokes Mortar, 29, 52, 175. Stovaine, 220. Strategy, chemical, see Tactics and Strategy. Sulphur Black, 155. Sulphuric acid, 171, 253. Supply Department, British, iox, 105. -Organisations, ioz. Surprise, critical factor of, 31, 32, 53, 111. 113, 114, 144.

Tactics and Strategy, 215, 216, 225. Tactical classification, 25, 28. 280