340 



Pentagonal dodecahedral symmetry 



43, 44. 



Pentagonal dodecahedron. . . 43, 44. 

 Pentagonal dodecahedron-group 43 46. 

 Pentagonal dodecahedron (tetrahedral) 

 Pentagonal icositetrahedron 86, 87, 88. 

 Pentagonal symmetry 61, 62, 163, 165, 



169,201. 

 Pentamery . . . . . . .61, 164, 169. 



Pentavalent nitrogen . . 236, 242, 247. 



Pentose 299. 



Pentosuria 299. 



Pentremites orbignyanus . . . . 62, 65. 

 Period (of axis) . . . . 23,119,120. 

 Periodical repetition . . 113,114,162. 

 Periodnumber 24, 25, 26, 39, 42, 49, 50, 



51, 53, 54, 65, 66, 69, 77, 81, 89, 120. 

 Perkin Jr. (W. H.) . .261,265,266. 



Perowskite 184, 192, 193. 



Perrier (A.) ........ 97, 100. 



Pfeffer (W.) . 223. 



Pfeiffer (P.) ..... 147,236,290. 

 Phaenoschisma acutum .... 62, 65. 



Phaeodavia 46. 



Phalaenopsis Schilleriana . . . .201. 



Phase 149, 150, 154, 155. 



Phase-differences . .149, 150, 154, 155. 



Phaseomannite 263. 



a-Phenantroline-derivatives . . .110. 



Phenoles (substituted) 201. 



Phenomena (chemical) 109. 



Phenomena (diffraction-) 79, 146, 147, 



148, 149, 150, 154, 155. 



Phenomena (physical) 23, 47, 89, 90, 91, 



92, 93, 95, 100, 105, 106, 107, 108, 



109, 145, 146. 



Phenyl-alanine 224. 



Phenylbromolactie acid . . . 267, 268. 



Phenylcrotonic acid 306. 



a-Phenyl-ethylamine . . . .219, 308. 

 Phenyl-ethyl-glycolic acid .... 309. 



^3-Phenylglycerinic acid 232. 



Phenylgroup (influence of). . . . 286. 



d-Phenyllactic acid 267, 268. 



Phenyl-oxy-acrylic acid 267. 



Phenyl--tolylacetic acid (/-men- 



thylether of). . . 322. 



Phenyl-p-tolylketene 322. 



Phillipsite ... 181, 182, 183, 187. 



Phlogopite 174. 



Phosphorus-atom (asymmetric) . . 242. 

 Phosphoruspentabromide . 289, 292. 

 Phosphoruspentachloride . 289, 292. 



Phosphorustribromide 288. 



Photographical method 150. 



Photochemical reactions 316, 317,318, 



320. 

 Photochemistry .316, 317, 320, 321. 



Phototropism 57. 



Phyllotaxis 36, 112, 160, 162, 163, 



164, 165, 166, 167, 169, 170. 



Physical phenomena 23," 47, 89, 90, 



9*, 92, 93, 94, 99, 103, 104, 105, 205. 



Physical symmetry ... 92, 93, 319. 



Physiological action (of antipodes) 224, 



225. 

 Physiological processes 224, 225, 303, 



312, 315, 316, 319. 



Pickard (R. H.) 257, 292. 



Pictet (A.) 225. 



Pidgeon (H. A.) 106. 



Piezoelectricity 105. 



Pine-apple 161. 



Pinene. . 299. 



Pinus 161, 166, 167. 



Piles (of crossed lamellae). 186, 196. 



/3-Pipecolinebitartrate 222. 



Piperidonium-derivatives . 281- 282. 



Pisano (L.) 162. 



Piutti (A.) 212, 224, 



Plane (of symmetry) 5, 6, 26, 58, 59, 

 64, 66, 67, 68, 254, 259. 

 Plane (of gliding symmetry). . .143. 

 Plane (of indirect symmetry) 254, 257. 

 Plants (phyllotaxis in) . . 16CV-165. 

 Platinum-anticathode . . . 151, 152. 

 Platinum-compounds (complex) . 253. 



Platinummetals 144. 



Plato 1, 8. 



Platonic polyhedra 43. 



Platycodon grandiflorus 62. 



Plotinos 2. 



Plurivalent atoms 206, 240, 241, 242, 



243, 244, 245, 282. 



Podalyria cordata 55, 56. 



Pohl (R.) . 146. 



Pointsystem 1 15, 1 16, 1 17, 1 18, 121 , 145. 



Polar forms 42, 43, 89. 



Polarisation (dielectric) ... 98, 99. 

 Polarised light ..... 94, 95, 185. 



Pole (of projection) 85. 



Polemonium coeruleum 36. 



Pollen-cells 47, 70, 74. 



Polyclinum constellatum 60. 



Polygoneae 74. 



Polygonum amphtbium 47. 



