332 



Triceratium pentacrinus 64. 



Triceratium Robertsianum . . 64, 68. 



Trichites 167. 



Triclinic symmetry . . . 55, 81, 119. 

 Trichlogin maritimum . . . . . . 59. 



Tridimensional gratings . . 113, 143. 

 Tridimensional patterns 113, 143, 144. 

 Tri-ethylenediamine-chromi-iodide 



214, 242. 

 Tri-ethylenediamine-chromi-rhodanide 



242. 

 Triethylenediamine-cobalti-bromide 



189, 190, 213, 214, 240. 

 Tri-ethylenediamine-cobalti-iodide 



240, 242. 

 Tri-ethylenediamine-cobalti-rhodanide 



240, 242. 

 Tri-ethylenediamine-rhodium-bromide 



214, 225, 260. 

 Tri-ethylenediamine-rhodium-iodide 



242. 

 Tri-ethylenediamine-rhodium-rhodanide 



242, 260. 



Tri-ethylenediamine-salts (complex) 107, 

 225, 239, 240, 242, 253, 260, 261, 266. 



Trigonal axis 22. 



Trigonal system 81, 119. 



Trigonal trapezohedron ..... 39. 



Trillings 173. 



Trimethylamine 227. 



Trimethylene-dicarboxylic acids . 250. 

 Trimethylene-tricarboxylic acids . 250. 

 Trioxy-glutaric acid .... 245, 246. 



Triphasia trifoliata 35. 



Tri-#-phenantroline-salts 107. 



Triphenylmethyl 153. 



Tripotassium-hydro-selenate . . .192. 

 Tripotassium -hydro-sulphate . . .192. 

 Tripotassium-sedium-chromate . .192. 

 Tripotassium-sodium-sulphate . . 192. 

 Tripropylamine-platini-chloride . .193. 

 Tris-#-dipyridyl-ferro-salts .... 225. 



Trisoctahedron 86. 



Tristetrahedron 86. 



Tri-thallo-hydro-sulphate .... 192. 



Trivalent carbon-atom 153. 



Tropine 226. 



Tschermak (G.) 74, 172. 



Tschugajeff (L.) 223. 



Tungsten-anticathode . . . . . . 147. 

 Turmaline 58, 96, 98, 99, 100, 101, 179. 



Tutton (A. E. H.) 136. 



Twinning 54, 101, 169. 



Twinning-axis 169, 170, 



Twinning-laws 170. 



Twinning-plane 169, 170, 173, 174, 175. 



176, 177. 

 Twinning (polysynthetic) .... 54. 



Twins (completion-) 170. 



Twins (compound) . . 169, 170, 171. 



Twins (cyclic) 171. 



Twins (polysynthetic) 171. 



Tijmstra. Bzn. (S.) 292, 



Types (of space-lattices) . . . .115, 

 116, 118. 148. 



Types (of symmetrical figures) . . 73. 

 Typical operations 18, 19. 



u. 



Ulpiani (C.) 286. 



Unary axis 23. 



Undosa undulata 59, 64. 



Uniaxial crystals . . . 180, 181, 182. 

 Unit (of pattern) ... Ill, 112, 114. 

 Unit-stere (theory of) . . . 136, 137. 

 Unlimited systems ... 16, 17, 110. 



Unrestricted forms 84, 85. 



Unsaturated compounds 227, 253 255. 



Unsymmetrical figures 35. 



Uranyl-double-acetates. 181. 



Uranyl-magnesium-sodium-acetate 192. 

 Uranyl-salts (photochemical catalysis 

 by) 301. 



V. 



Valency 136, 137, 227, 277. 



act. Valeric acid 292. 



Vectorial properties 91. 



Vectors (symmetry of) 91. 



Vegard (L.) 183. 



Velocity-constants 280. 



Velocity (of decomposition) 217, 218, 



219, 220, 221, 280, 288, 293299. 



Velocity (of diffusion) 281. 



