345 



Subgroups 74, 82, 91, 92, 98, 99, 105, 



106. 



Submicroscopical lamellae. 188 200. 

 Substitution (and crystalform) 138, 139. 

 Successive reflections 27, 28, 29, 30, 31, 



32. 



Sugar-acids 206. 



Sugars . . . 224, 228, 202, 303, 309. 

 Sulphides (crystalforms of) ... 144. 



Sulphurdioxide 150. 



Sulphur-atom (asymmetric) . . . 242. 



Sulphuric acid 202. 



Sunflower 161, 166, 168. 



Superposition (of hpysical causes) 95, 



105, 106, 107, 108, 109, 110, 111, 316. 

 Supersaturated solutions 210, 212, 213, 



215, 216. 



Surface-density 118. 



Susceptibility (magnetic) . . 249, 320. 



Swarts (F.) 246. 



Swietenia mahagoni 61. 



Sylvine 152157, 174. 



Symbols (fylfot-) 37. 



Symbols (of groups) 37, 71. 



Symmetry 1, 2, 7, 11, 12, 34. 



Symmetry (aesthetic action) 2, 3, 5, 6. 

 Symmetry (apparent) 1 2 1 , 1 22, 1 76 1 83. 



197200, 

 Symmetry (axis) 3, 9, 14, 15, 20, 22, 



23, 27, 34, 35, 42, 43, 73, 89, 90, 91, 



105, 113, 119, 126, 127, 128. 

 Symmetry (centre) 73, 103, 104, 118, 



245, 256. 



Symmetry (character). . . . 12, 18. 

 Symmetry (crystallonomical) 137, 138. 

 Symmetry (definition) . .11, 12, 15. 



Symmetry (doctrine of) 2. 



Symmetry-elements. ... 20, 22, 26. 



Symmetry (maximum) 98. 



Symmetry (mimetic) 122, 171, 176, 185, 

 187, 197, 198, 199. 



Symmetry (minimum) 99. 



Symmetry (molecular) 202, 203, 204, 



236243, 247, 251, 254268, 312. 



Symmetry (of natural forms) . . 7, 8. 



Symmetry (of patterns) 99, 100, 101, 



102, 103, 104. 



Symmetry (physical) 88, 89, 96, 97, 98, 

 99, 100, 101, 316. 



Symmetry-plane (diagonal) .57, 64, 66, 

 67, 68, 72, 73. 



Symmetry-plane (horizontal) 5, 6, 58, 

 64, 66, 72, 73. 



Symmetry-plane (vertical) 5, 6, 58, 64, 

 65, 72, 73. 



Symmetry-principle 1, 322. 



Symmetry-properties 11, 12, 20, 21, 22, 

 49, 82, 84, 245, 247. 



Synoecum turgcns 63. 



Synthesis (artificial) 298, 300, 301, 304, 



309, 315. 



Synthesis (asymmetric) 253, 284, 293. 



299, 300, 301, 302, 304, 309, 310, 



311, 315, 319, 321, 322. 



Synthesis (natural) 298, 300, 301, 304, 



311, 312, 315, 316, 319, 



System (cubic) 83, 86, 121, 141, 142. 



System (crystal-) . . 74, 82, 83, 84. 



System (regular) .116, 129, 130, 131. 



Systems (congruent) 8, 9, 10, 17, 19, 



21, 31. 



Systems (infinite) 17, 18, 19, 113, 129, 

 130, 131, 159. 



Systems (limited) 17, 19, 28, 112, 113. 

 Systems (point-) 93, 115, 116, 130, 131, 



132, 133. 



Systems (symmetrical) 129, 130, 131, 



132, 133. 



Systems (unlimited) 17, 18, 19, 28, 



93, 113. 



T. 



Talc 174. 



Tammes (J.) 111. 



Tanret (G.) '. . . 262, 263. 



Tartaric acid 205, 211, 219, 223, 224, 



227, 231, 235, 256, 268, 270, 297, 



310, 312, 320. 



Tartrates 205, 208. 



Tautomeric changes 235. 



Tendency (to higher symmetry) . 183. 



Tendril 9. 



Terada (T.) 148. 



Teratology 201,202. 



Ternary axis .... 23, 24, 81, 131. 



Ternary symmetry 35, 201. 



Tetartohedral forms . 55, 74, 82, 132. 

 Tetartohedrism. ... 82, 84, 91, 131. 



Tetarto-symmetry 32. 



Tetracetyl-helicine 307. 



Tetra-ethyl-ammonium-stannichloride 



199. 

 Tetra-ethylenediamme-/i-amino-nitro- 



dicobaltibromide . . 255. 



