INDEX. 



Ability of adjustment, 379. 



Abysmal zone, and ctenobranchina, 

 138. 



Acadian revolution, 42. 



Acceleration of development, 319; 

 and retardation, 197. 



Accounting for variability, 198. 



Acme of life-period of genus, 293. 



Acquirement of characters, 252; of 

 differences by modification, 344; of 

 permanency, 198, 296, 299; of va- 

 riation, 158. 



Act of evolving and order of events, 

 372. 



Actinimeres, 222. 



Adaptation to environment, 114. 



Adaptation of Cyclobranchina, 141; 

 Aspidobranchina, 141 ; Pteno- 

 glossa, 141 ; Rachioglossa, 141 ; 

 Toxiglossa, 141 ; Rhipidoglossa, 

 141 ; Taenioglossa, 141; Siphonos- 

 tomata, 141 ; Holostomata, 141 ; 

 families of Gastropoda, 142 ; gen- 

 era of Gastropoda, 142 ; of gen- 

 era with restricted specific ad- 

 justment. 142 ; and taxonomic 

 rank, 148. 



Adjustment to environment and 

 time, 117; to changed habitats, 139; 

 closeness of, and rank, 142; con- 

 cerns varietal characters, 143; and 

 structure, 147. 



Adolescent, 94. 



Adult, 94. 



Agamogenesis, 169. 



Ages, geological, 26, 69. 



Age of earth, Dana, 58; Houghton, 

 59; Kelvin, 58; Clarence King, 58; 

 Upham, 59; Wallace, 60; of Fishes, 

 26; Invertebrates, 26; Mammals, 

 26; Man, 26; Reptiles, 26, 68. 



Algonkian, 30. 



Alluvial formation, 13, 19. 



American continent and revolutions, 

 46; geological history, 25; school 

 of evolutionists, 197 ; spirifers, 

 range of, 313. 



Amoeba, 221, 165. 



Ammonites, and formations, 28. 



Ammonoidea, a description of, 345. 



Anabolism, 177. 



Analogy and analogous parts, 227. 



Analytic and synthetic methods of 

 classification, 238. 



Ancestry, definition of, 120; and en- 

 vironment, 98; and environment, 

 as causes of evolution, 119; and 

 the beginning of the individual, 

 120; and hard parts, 98; and ori- 

 gin of species, 127. 



Ancient notions of geology, n. 



Ancylobrachia, evolution of, 256, 

 263. 



Angeschivempt Gebirge, 13, 16. 



Am^ulatus zone, 68. 



Animal kingdom, classification of, 

 201. 



Antimeres, 222. 



Antiquity and distribution, 144; of 

 individual characters, 190. 



Appalachian revolution, 34, 40, 42. 



Appearance, first, of new characters, 

 267. 



Archaean, 14. 



Archetypal structure, 233. 



Area, 70. 



Aristotelian species and genus, 200. 



Arthromeres, 224. 



Arthropoda, definition of, 204. 



Arthropomata, evolution of, 256. 



Astacus ftuviatilis, development of, 

 1 80. 



Astrceidce, rate of differentiation, 85. 



Astronomical time estimates, 56. 



Atavic, 94. 



Athyridce, 279. 



Athyris, 286. 



Atrypa reticularis, life-history of, 

 315, 320. 



Atrypidce, 279. 



Attainment of diversity by cell, 165. 



Auxology of Bather, 94. 



Avicenus, u. 



Axes of spiral cones, in Helicopeg- 

 mata, 287. 



Azoic, 22. 



Bather, and the term Auxology, 94. 

 Bathmism, or growth force, 197. 

 Bathmology, Hyatt, 94; Cope, 94. 

 Bathybic Plankton, 116. 

 Bathymetric zones, 117; and Cteno- 

 branchina, 137. 

 Beginning of individual life, 220. 



385 



