346 



Tetra-ethylenediamine-/A-amino-peroxo- 

 cobalti-cobalte-salts 255. 



Tetragonal axis 23, 25. 



Tetragonal motifs 123, 124. 



Tetragonal patterns 115, 123, 124, 129. 



Tetragonal repeats 123, 124. 



Tetragonal system 83, 121. 



Tetrahedral-pentagonaldodecahedron 

 86, 87, 88. 



Tetrahedron 11, 16, 43, 87, 88, 206, 

 238, 243, 268,' 291. 



Tetrahedron-group 43, 44. 



Tetrahexahedron .88. 



a-c-Tetrahydro-/3 naphtylamine. . 235. 



Tetrahydro-papaverine-d-tartrate . 222. 



Tetrahydro-qninaldine 218. 



Tetrahydro-quinaldine-hydrochloride 

 218, 274, 275. 



Tetramethylammonium-platinichloride 



199. 



Tetramethylene-derivatives . . . 259. 



Tetramethylmethane ...... 238. 



Tetrapropyl-ammonium-platinichloride 



199. 



Thamnastvaea arachnoides .... 65. 



Theorems (Euler's) 19, 20, 29, 127, 128. 



Theorems (of rational parameters) 



78, 79. 



Theorems (of reflection) 148, 149, 150, 



154, 155. 



Theories (mathematical) 1. 



Theory (Barlow-Pope's) 139, 140, 141, 

 142, 143, 144. 



Theory (Bravais') . . 125, 126, 137. 



Theory (crystalstructure) 18, 19, 113, 

 125, 126, 133, 135, 136, 139, 140, 

 141, 142, 143, 144, 145157, 158, 

 159. 



Theory (Mallard's) . . . 187200. 



Theory (phyllotaxis-) . . . 160170. 



Theory (Stokes') 98, 99. 



Theory (Van 'tHoff-Le Bel's) 157, 

 204, 205, 206, 234, 236, 238, 241253. 



Thermal equilibrium 234. 



Thionylchloride 292. 



Thomas (M. B.) 247. 



Thomas (W.) 250. 



Thompson (H. B.) 309. 



Tin-atom (asymmetric) 242. 



Tolloczo (St.) . 295. 



Torsion 92, 105, 106, 107. 



Transformation (of coordinates) . 10. 



Transformations (polymorphic) 197, 198. 



TVaws-isomerides 257, 258, 259, 261, 



262. 



Transitionpoint 197, 198, 204, 207, 209, 



210, 211, 212, 216, 220, 222, 281. 



Transition (polysymmetric) 197, 198. 



Transitiontemperature 197, 198, 204, 



207, 209, 210, 211, 212, 216, 220, 



222, 231, 281, 308. 



Translation 13, 15, 18, 19, 28, 29, 113, 



114, 126, 127, 128, 162. 



Transversal growth 166. 



Trapezohedron 40. 



Traube (H.) 271. 



Trialkali-hydroselenates . . . . . 198. 



Trialkali-hydrosulphates 198. 



Triammonium-hydrosulphate. . . 198. 



Triboluminescence 231. 



1 -2-3-5-Tribromotoluene . . . . .139. 



1-2-4-6-Tribromotoluene 139. 



Triceratium digitale 65, 69. 



Triceratium pentacvinus 65. 



Tnceratium Robertsianum . . 65, 69. 



Trichites 172. 



Triclinic symmetry . . . 56, 83, 121. 



Trichlogin maritimum 61. 



Tridimensional gratings. . 116, 147. 

 Tridimensional patterns 116, 147, 148. 

 Triethylenediamine-chromi-iodide 220, 



251. 

 Triethylenediamine-chromirhodanide 



251. 



Triethylenediamine-cobalti-bromide 

 194, 195, 220, 233, 249, 250, 252. 

 274. 



Triethylenediamine-cobalti-iodide 249, 



251, 274. 

 Triethylenediamine-cobaltirhodanide 



249, 251, 274. 

 Triethylenediamine-rhodiumbromide 



220, 233, 252. 

 Triethylenediamine-rhodium-iodide 



251. 



Triethylenediamine-rhodiumrhodanide 



251. 



Triethylenediamine-salts (complex) 110, 

 220, 233, 250, 251, 264, 273, 274, 

 280. 



Trigonal axis 23. 



Trigonal system 83, 121. 



Trigonal trapezohedron 40. 



Trillings . .' . . 178. 



Trimakmates (complex) .... 250. 

 Trimethylamine 235. 



