Index 



Aardvark, 176 



Abraxas, distasteful, 247 



Abyssal zone, 21 



Acacia, leaves of, 51 



Acanthocephala, 139 



Acceleration of evolution, 330 



Acineta, 130 



Acquired characters, inheritance of, 76, 



77-78, 79 

 Actinopterygii, 161-163 

 Adaptation, 14, 39 



of eggs, 51-52 



to extreme conditions, 250 

 Adaptive peaks, 264 

 Adapti\e radiation, 152 



in forelimbs of mammals, 38-39 



of honey-creepers, 310-312 



of reptiles, 168 

 Adaptive resemblances, 240-249 

 Adaptive valleys, 264 

 Adenosine triphosphate, 59 

 African-Malagasy sweepstakes, 319-320 

 Agar, W. E., 85 

 Age and Area theory, 322-323 

 Agelaius, 27, 28 

 Agnatha, 159 

 Agnostic period, 82-84 

 Alcohol, formation of, 94 

 Aldehyde, formation of, 94 

 Aldrich, L. T., 75 

 Algae, advances of, 109 



age of, 111 



origin of, 124 

 Allantois, 168 

 Allee, W. C, 326 

 Allen's rule, 211 

 Allometry, 261-262 



equation, 261 



of bear teeth, 255-256 

 Allopolyploidy, 152 



defined, 293 

 AUotetraploidy, formation of, 298-299 

 Alpatov, W. W., 211 

 Alpine species, 15, 16 

 Alternation of generations, 108-109 

 Amber, fossils in, 68 

 Ambystoma, breeding season, 275 

 American Ornithologists' Union Checklist, 



28 

 Amia, 163 



Amino acids, abiotic origin of, 94 

 Ammocoetes, 149, 159 

 Ammonoidea, 142 

 Amnion, 168 

 Amoeba, 89, 130 



and origin of Metazoa, 134 



proteus, 129, 130 



Amphibia, absent from oceanic islands, 25 



and visual pigments, 60 



kidney of, 48 



origin of, 166-167 



origin of modern orders, 167 



vertebrae of, 33 

 Amphidiploidy, defined, 298 

 Amphineura, 141 

 Amphioxus, 157, 158 



aortic arches, 48 

 Ampliiuma, 57, 58 

 Amylase, 55 

 Anabolism, 97 

 Amgale, 182, 183 



Analogy, contrasted with homology, 39-42 

 Anderson, E., 85, 291, 292 

 Andrews, H. N., 127 

 Andrews, R. C, 335, 337 

 Animal breeding, 331-332 

 Animal Kingdom, 89, 104 

 Animals, differentiated from plants, 102 

 Angiosperms, 122-124 



abundance of, 122 



life cycle of, 123 



origin of, 124 



reproduction in, 124 

 Annelida, 142-143 



fossils of, 71 



morphology of, 142-143 



phosphagens of, 59 



tlieory of origin of chordates, 156-157 

 Antennae, of crayfish, 36, 37 



of molluscs, 37 

 Antheridia, 107 



of moss, 112, 113 

 Anthony, ]., 177 

 Anthozoa, 137 

 Antibody, defined, 57 

 Antigen, defined, 56 

 Antigen-antibody reactions, 56-59 

 Antirrhinum, 208 

 Ants, 277 

 Anura, aortic arches of, 49 



origin of, 167 

 Aortic arches, 48-50 

 Apes, 179-181 



fossil, 183-188 

 Apoda, 167 

 Aposematism, 243-246 

 Appendages, of Crustacea, 35-39 

 Appendix, vermiform, 42 

 Arachnida, 146 



Arachnid theory of chordate origin, 155 

 Archegonia, of moss, 112-113 

 Archeopteryx, 171, 172 

 Archeozoic Era, 63, 65 

 Archetypes, theory of, 29 



339 



