316 



Dichlofo-dimethyl-propionic acid .302. 

 Dichloro-dimethyl-succinic acid . 302. 

 Dicotyledons ........ 35, 164. 



Didodecahedron 84, 85. 



Dielectric polarisation . . 96, 97, 102. 

 Diethylamine-platini-chloride . . . 193. 

 Diethylamine-stanni-chloride . . . 193. 

 Diffraction (of Rontgen-rays) 77, 97, 

 142, 144, 146. 

 Diffraction-phenomena 77, 97, 142, 



144, 146. 

 Diffraction-theory . . 142, 144, 146. 



Diffusion-velocity 281. 



Digitalis pur pur ea .... 195, 196. 

 Dihedron-groups (Is order) 38, 39, 40, 



73, 87. 



Dihedron-groups (2nd order) 62, 63, 

 65, 66, 73, 87. 



Dihedron . 39. 



7-^-Diketo-2-5-dimethyl-piperazines 



247. 



Diketo-piperazines . . 244, 246, 247. 

 Dimensions (intermolecular) . . . 142, 



146, 151. 



Dimethyl-bromo-succinate .... 226. 

 ^-^-Dimethyl-cyclopentane-l-car- 



boxylic acids ..." 249. 



Dimethyl-dichloro-propionic acid . 302. 

 Dimethyl-dichloro-succinic acid . 302. 

 Dimethyl-dioxy-glutaric acid . . . 203. 



Democritos 2. 



2-J"-Dimethyl-diketo-piperazine . 247. 

 2-<?-Dimethyl-diketo-piperazine . 247. 

 dJ-^'-Dimethyl-succinic acid . . . 214. 



Dimorphism 183, 191, 266. 



Dinitro-diethylenediamine-cobalti- 



chloride 208. 



Dinitro-tribromo-toluenes . . . .135. 



Dioptase 53. 



Dipentene-tetrabromide .... 223. 



Diploid 84, 85. 



Directional affinities 229. 



Directional influence (of atoms) 277, 



294, 295. 



Directional influence (of crystal-nucleus) 



210. 



Discomedusae . ' 54, 59. 



Discontinuous medium . . 141, 142. 



Dispersion (rotation-) . . . 239, 240. 

 Disposition (of leaves) 155, 156, 157, 



158, 159, 160, 161, 162, 163, 164, 165. 

 Dissymmetry 105, 106, 200, 228, 234, 



235, 236, 237, 238, 256, 260, 261, 



262, 267, 273, 283, 285, 288, 293. 



Distance (of net-planes) 114, 115, 144, 



145, 146, 149, 151. 



Distortion (of molecules) 231, 234, 278. 



Distribution (of points) 113. 



Divergency (in phyllotaxis) 156, 158, 



164. 



Divina proportio 158, 159, 164, 195, 196. 

 Doctrine (of symmetry) . . 2, 21, 26. 

 Dodecahedron (pentagonal) . 42, 43. 

 Dodecahedron (rhombic) . . 85, 86. 

 Dodecamine-hexol-tetra-cobalti-bromi- 



de i 253. 



Domain (fundamental). . . 131, 132. 

 Double bonds .... 253, 254, 255. 

 Double-salts . . .201, 204, 205, 224. 



Drymonema victoria 59, 64. 



Dualism (in symmetry-definition) 10. 



Dutilh (H.) 215. 



Dyacisdodecahedron . . 84, 85, 86. 

 Dyad character (of substitutes) . 265. 

 Dynamical equilibrium . . 227, 228. 

 Dynamical theory (of optical rotation) 



273. 



E. 



Eccentricities (crystallographical) .167. 



Eder (]. M.) 303. 



Effects (aesthetic) . . 2, 3, 4, 5, 6. 

 Effects (physical) .... 92, 93, 102. 



Eidophone 2. 



Einthoven (W.) 106. 



Electric current 103, 104. 



Electric momentum 102. 



Electromagnetic field . . 95, 96, 106. 

 Electrostatic field . 94, 95, 96, 106. 

 Electrolysis (in magnetic field) . . 304. 

 Elements (crystal-forms of) 138, 140, 



141. 



Elements (of pseudo-symmetry) .119. 

 Elements (symmetry-) . 19, 21, 25. 

 Elliot (J. H.) 285. 



