347 



Trimethylene-dicarboxylic acids . 262. 

 Trimethylene-tricarboxylic acids . 262. 

 Trioxalates (complex) . . . 249, 250. 

 Trioxyglutaric acid . . 254, 255, 256. 



Triphasia trifoliata 36. 



Tri-a-phenantroline-salts 110. 



Triphenylmethyl 158. 



Tripotassium-hydroselenate . . . 198. 

 Tripotassium-hydrosulphate . . .198. 

 Tripotassium-sodiumchromate . . 198. 

 Tripotassium-sodiumsulphate. . . 198. 

 Tripropylamine-platinichloride . .199. 

 Tripropylenediamine-salts (complex) 



253. 

 Tris-a-dipyridyl-ferrosalts .... 232. 



Trisoctahedron 88. 



Tris tetrahedron 88. 



Trithallo-hydrosulphate 198. 



Triton cristatus 201. 



Trivalent carbon-atom 158. 



Trivalent nitrogen-atom .... 242. 



Tropic acid 299. 



Tropine . 235. 



Tropism 57. 



Tschermak (G.). . . , . . 76, 177. 



Tschugajeff (L.) 231. 



Tucker (S. H.) 293. 



Tungsten-anticathode 151. 



Turmaline 59. 60, 98, 100, 101, 102, 



103, 184. 

 Tutton (A. E. H.) ...... 139. 



Twinning 55, 104, 174, 175, 176, 177, 



178, 192, 199. 



Twinning-axis .... 174, 175, 176. 



Twinning-laws . . . . 174, 175, 176. 



T winning-plane 174, 175, 176, 177, 



179, 181. 

 Twinning (polysynthetic) .... 55. 



Twins (completion-) 174. 



Twins (compound) 174. 175, 176. 187. 



Twins (cyclic) 175, 176. 



Twins (polysynthetic) 175, 177, 187, 192. 



Tijmstra. Bzn. (S.) 307. 



Types (of space-lattices) 118, 119, 121, 



153. 



Types (of symmetrical figures) 74, 75. 

 Typical operations 19, 20. 



u. 



Ulpiani (C.) . . 

 Unary axis . . 

 Undosa undulata 



. . 301. 

 . . 24. 

 61, 65. 



Uniaxial crystals. . . 184, 185, 187. 

 Unit (of pattern) . . 114, 115, 117. 

 Unit-stere (theory of). ... 139, 140. 

 Unlimited systems ... 17, 18, 113. 



Unrestricted forms 86, 87. 



Unsaturated compounds 236, 242, 



264269. 



Unsymmetrical figures 36. 



Uranyl-double-acetates 186. 



Uranyl-magnesium-sodiumacetate 1 97. 



Uranylsalts (photochemical catalysis 



by) 318. 



V. 



Valency, . . 139, 140, 235, 242,291. 



act. Valeric acid 307. 



Valine . 224. 



Vectorial properties 93,238. 



Vectors (symmetry of) 93. 



Vegard (L.) 147, 188. 



Vegetable cells 298, 299, 301, 302, 303. 



Velocity-constants 234, 295. 



Velocity (of decomposition) 223, 224, 

 225, 229, 313, 314. 



Velocity (of diffusion). . . .295,296. 



Velocity (of inversion) 295. 



Velocity (of racemisation) 233, 234, 235, 

 236, 237, 308. 



Velocity (of reaction) 1 10. 223, 224, 225, 

 226, 227, 228, 229, 234, 235, 236, 

 294, 296, 297, 298, 302, 320. 



Vibrating radicals 235. 



Vibrations (harm onic) . . . . 3, 4, 5. 



Villari (E.) 106. 



Villiers (A.) 263, 264. 



Vinci (Leonardo Da) 163. 



Vine 55. 



Viola (C.) 30, 31, 76, 126. 



Virtual reflections 31,32. 



Visual observation 2, 3, 5, 6. 



Vitalism 223,301,304. 



Vitalists 301, 311, 316. 



Voigt (W.) 105. 



Volatility (of inorganic compounds) 203. 



Volume-effect (polymorphic) . . . 198. 



Volume (of elementary cells). . .118. 



Volvo x globator 36. 



Vries (H. de) 201. 



W. 



Wagner (E.) 147, 151. 



