Bunge, v., 248 Bütschli, 91 Calcium, 97 Calkins, 33 Cambium, 120, 183, 220 Catalysis, 164, 203 Categories, 6 f. Cause, 99 ff. Cell, 27 f. -division, 28 ff., 53, 94 -lineage, 58, 70 -theory, 27 f. Chemical theory (of morphogenesis), 134 ff. Chemistry, systematics of, 244. Child, C. M., 180 Chromatic regulations, 197 Chromatin, 28 f. Chromosomes, 30, 237 Chun, 66 Classification, 246 f. *Clavellina*, 129, 154, 162 f. Cleavage, 35 ff., 53, 58, 60, 63, 71, 92 Colloids, 187 Compensatory process, 112 Complex potencies, 112, 120 Conic sections, 243 Conjugation, 33 Conklin, 86 Contingency, 218, 284 ff. 304 Continuity of germ-plasm, 215, 227 Cope, 273 Correlation (of masses), 93 (of parts), 247 Correns, 228 Crampton, 70 f. Crayfish, 105 Ctenophores, 66 Cumulation, 301 ff., 308 ff., 314, 317 Cuvier, 247 Darwin, Ch., 260 ff., 271, 283 Darwinism, 260 ff., 271, 283 ff., 293 ff., 304 Davenport, 191, 206 Delage, 32 Descent, theory of, 250 ff. Description, 12, 50 Detto, 172 Directive stimuli, 102 ff. Doncaster, 232 Dreyer, 92 *Echinus*, 27, 33 ff., 60 ff., 68, 81, 85, 87, 98, 104, 108, 111, 154, 232, 235 Ectoderm, 41, 81, 122 Egg, 31, 33 f. Ehrlich, 207 f. Eimer, 292 Elementary organs, 46 ff. processes, 46 ff. Elements of nature, 9 Embryo, 44 frog’s, 59, 65, 67 half, 59, 61, 66 ff. whole, 61, 67 f. Endoderm, 41, 81 Entelechy, 143 f., 224 f., 295 Entwickelungsmechanik, 57, 70, 78, 241 Enumeration, 297, 300 Enzymes, 164, 203 Epigenesis, 26, 45, 54, 72, 144, 301 Equifinality (of restitutions), 159 f. Equipotential, 83 Eschenhagen, 195 Evolutio, 26, 45 f., 54, 59, 61, 64, 72, 144, 205, 301 Evolution, 8, 21, 46, 250, 301, 305, 311 ff., 317 Experience, 7 f., 12, 212 Experiment, 51, 56 f. “Explaining,” 51, 309 Explicit potency, 84 Fasting, 199 f. Ferments, 164, 203 f. Fertilisation, 32 ff. Fischer, 278 Foges, 107 Form, closed or open, 49 Form, organic, specific, 16 ff., 25, 92, 293 ff. Forma accidentalis, 293 essentialis, 294 f. Formative stimuli, 102 ff., 113, 118, 133 Francé, 158, 239 Frédéricq, 196 Frog, embryo of, 59, 65, 67 Fromm, 205 Function (mathematical), 80 Fungi, metabolism of, 201 Gaidukow, 197 f. Galls, 101 Galton, 228, 238 Gamble and Keeble, 198 Gastrula, 41, 61, 81 Gautier, 239 Geographical distribution, 251 f. Geometry, solid, 243 Germ-layers, 41, 44, 61 -lineage, 215 -plasm, 52, 215 Gifford, Lord, 1 ff., 322 Godlewski, 105, 155, 235 Goebel, 116 Goethe, 247 Goette, 48, 56, 214 Goltz, 181 Growth, 30, 93 f. Gruber, 236 Haeckel, 37, 41 Half-embryo, 59, 61, 66 ff. Haller, A. v., 26 Harmony, 107 ff., 117, 295 Hausmann, 206 Heat production, 193 Hegel, 307, 311 ff.