341 



Polyhedra 17, 18, 26, 40, 42, 55, 64, 

 68, 69, 87, 88. 



Polymerisation 203. 



Polymorphism 185, 188, 197, 198, 199, 



200. 



Polypeptides 225, 227, 289. 



Polysymmetrical changes . 198, 199. 



Polysymmetry 198, 199. 



Polysynthetic twins 176. 



Pope (W. J.) 112, 139, 141,145,212, 

 214, 218, 219, 222, 229, 230, 231, 



232, 235, 239, 241, 242, 246, 251, 

 257, 258, 265, 266, 274, 277, 296, 

 301, 305, 319. 



Poplar-leaf 4, 8. 



Ponies furcata 61, 65. 



Porter (C. W.) 4 226. 



Position-isomerides .... 138, 139. 



Positions (change of) 13, 14, 15, 16, 



17, 19, 20. 



Positions (parallel) 15. 



Possible axes 80, 81. 



Possible crystal-edges 80. 



Possible faces 78, 79, 80. 



Possible symmetries . . 12, 16, 26. 

 Potassium . 152, 153, 154, 155, 156. 



Potassiumbichromate 37. 



Potassiumchloride .... 152 156. 

 Potassiumchromi-oxalates 220, 232, 



233, 249, 250, 274, 276, 297, 318. 

 Potassium-cobalti-oxalates 216, 249, 



250. 



Potassiumcyanide . . . 216, 249, 250. 

 Potassium-dithionate ... 184, 186. 

 Potassiumterrocyanide 184, 189, 194, 



195. 



Potassiumhydroxide. . 288, 290, 309. 

 Potassium-iridium-oxalate 250, 274, 



276. 



Potassiumpermanganate 310. 



Potassiumrhodiumoxalates 215, 220, 

 249, 250, 274, 275, 276, 279. 

 Potassiumsodiumchromate . . . 198. 

 Potassiumsodiumracemate .... 208. 

 Potassium-strychnine-chromi-oxalate 



233. 

 Potassiumsulphate . . 178, 179, 198. 



Potassium- tartrate 213. 



Potassium tetrathionate ... 54, 55. 



Pottevin (H.) 228. 



Poulsson (E.) 225. 



Precipitation (from solutions) 214, 215, 



216. 



Pre-existing dissymmetry 298, 302, 303, 



309, 311, 



Prehnite 190. 



Prendel (R.) 209. 



Preponderant factors .... 275, 277. 

 Preservation (of symmetry) . . . 57. 



Price (Th. S.) 229, 305. 



Primordial cells 167, 168. 



Principal group 73, 74, 75, 82, 91 , 92, 98. 

 Principle (of Huyghens) . . . 148. 

 Principle (of symmetry) . .1.2, 322, 



Pringsheim (E. G.) 255. 



Pringsheim (H.) 163, 224, 225, 227, 



299, 



Process (of repetition) 2. 



Projection (Gadolin's) 84, 85, 86, 87. 

 Projection (stereographical) . 84, 85. 



Propeller 41, 42. 



Proportio divina 163, 169, 201, 202. 



Propylalcohol 202. 



Propylalcohol (tsp) ....... 202. 



Propylamine 202. 



Propylamine-stannichloride . . . 199. 



Propylene-diamine 253. 



Propyl-iodide 281. 



Propyl-isopropyl-cyano-acetic acid 248. 

 Propylamine-stannichloride . . . 199. 

 Propyl-isopropyl-cyano-acetic acid 248. 



Propylpiperidine 281. 



Proteids 223, 298, 300. 



Prunier (G.) 264. 



Przibram (R.) 57. 



Pseudo-asymmetric carbon-atoms 256, 



261 



Pseudocoprosterol 222. 



Pseudocubic space-lattices 176, 182, 



192, 200. 



Pseudoracemism . . . 229231, 232, 



280, 319. 



Pseudoracemism (partial) .... 232. 



Pseudorhombohedron . . . . 182, 183. 



Pseudosymmetry 122, 123, 171, 176, 



177183, 197200, 271, 277, 278. 



Pseudosymmetry (elements of) . 122, 



123, 187, 188. 



Purdie (T.) 212, 219, 



Pyramidal hemihedrism ... 90, 91. 



Pyrite 73, 175. 



Pyritohedron 87, 88. 



Pyro-electricity . .99, 100, 105, 271. 

 Pyro-inductive phenomena . 97, 100. 



Pyrophyllite 174. 



Pyruvic acid 297. 



