390 



INDEX. 



Horizon, 69. 



Houghton, relative time-duration, 



48. 

 How does evolution proceed, 269. 

 Haeckel and phylogenesis, 95. 

 Humphreys and Abbott, report, 57. 

 Hyatt and Bathmology, 94. 

 Hyatt's law of rapid expansion at 



point of origin, 341. 

 Hypostrophic, 94. 



Idea of creation, evolutional, 373. 



Idea of mutability and origin of spe- 

 cies, 187. 



" Ideal plan " in classification, 236. 



Immutability and mutability, 125. 



Immutability of species, 125, 155; 

 idea of, 153. 



Imperfection of evidence, 208. 



Importance of fossils, 20. 



Improvement resulting from evolu- 

 tion, 357. 



Increase in Darwin's theory, 194. 



Increment, in evolution, 296. 



Individual characters, 5; formation 

 of, 125; development, 219; nature 

 of, t6o, 162; of Scaliger, 201. 



Individuality of an organism, 166. 



Infantine stage of growth, 94, 174. 



Inferior stratified rocks, 18. 



Initial stage of evolution, 2S2. 



Initiation, development, and evolu- 

 tion, 352; of generic characters, 

 291 ; new characters, 267; new gen- 

 era, 256; a new genus, 291; new 

 species of cephalopods, 340; and 

 origin, 70; of Cyrtoceratidre. 339; 

 of Nautilidae, 340; of Orthocera- 

 tidae, 339; of species of Ptychop- 

 teria, 322. 



Inorganic and organic matter, 166; 

 properties and organic characters, 

 186; things not evolved, 96; things, 

 unchangeable, 83. 



International Congress, nomencla- 

 ture of, 69. 



Interpretation of facts of evolution, 

 119, T2I. 



Interruption of record, 46. 



Intrinsic character, example of, 271; 

 and extrinsic characters, 265, 270; 

 and extrinsic evolution, laws of, 

 311, 312; and extrinsic in machin- 

 ery, 272; marks of organism, 175; 

 tendency of organism, 176. 



lonians and transmutation, 152. 



Jugum of Brachiopods, 283, 288. 

 Jurassic formations, 28. 

 Jura-trias, 30. 

 Juvenescent stage, 174. 



Katabolism, 177. 

 Kelvin — time estimates, 56. 

 Kinds of hard parts, 99. 

 Kirwan, Richard, 14. 



Lamarckians and Neolamarckians, 



198. 

 Lamarck and mutability of species, 



152. 

 Lamellibranchs, described, 245. 

 Laminarian zone, Ctenobranchina 



of, 137. 

 Land, as environment, 113. 

 Land surfaces, lowering of, 60. 

 Lankester's schematic mollusk, 325; 



classification of mollusca, 246. 

 Larval stage, 94, 174. 

 Law of adjustment to environment, 



138; of chronology of rocks, 76; 



of development, 185; of mutabil- 

 ity, 158. 

 Laws of adaptation of Gastropoda, 



147; of evolution, 129, 140, 197, 



322; emphasized, 359. 

 Le Conte, Joseph, 24. 

 Lehmann's classification, 12, 17. 

 Length of geological time, 55, 61. 

 Leonardo da Vinci, 11. 

 Life-history, generic, 276; of Heli- 



copegmata, 277; time-scale for 



study of, 57. 

 Life-period of a genus, 88, 291. 

 " Like produces like, with an incre- 

 ment," 296. 

 Limnobios, 116. 

 Linne and number of species, 149; 



Or do. Class is of, 201. 

 Lipocephala, 249. 

 Littoral zone, and Ctenobranchina, 



137- 

 Living, characteristic of organism, 

 163; implies change, 164; organ- 

 isms and purposeful development, 



97- 



Locomotion, 230; and nervous sys- 

 tem, 231. 



Loop of Ancylobrachia, 282 ; and 

 Brachidium, 282. 



Lyell, Sir Charles, 11. 



Lyell, and time-value of fossils, 66. 



Lyell's classification, 21, 22, 24. 



Madreporaria, evolution curve of, 

 86; rate of differentiation of, 85. 



Maclure and American rocks, 18. 



Magellania flavescens, 265. 



Mammals, evolution of, 323. 



Man, an organism, i. 



Marine conditions of life, 116; or- 

 ganisms and paleontology, 116. 



Marine province, 113. 



