646 



INDEX 



Annelida, 93, 103, 344 

 Annual rings, 246, 2Jilf 

 Annuals, 240 

 Anodonta, 97 

 Anopheles mosquito, 618 

 Anoplura, 101 

 Anseriformes, 114 

 Ant-eater, 487 

 Antelopes, 509 

 Antennae cleaner, 207 

 Antennae, insects, 199, 202, 205 

 Anterior limb, 332 

 Anterior peduncles, 351 

 Antheridia, moss, 175 



Oedogonium, 172 

 Anthozoa, 81 

 Anthrax, 622 



Anthropological measurements, 563 

 Anthropology, 531 

 Anthropometry, 563 

 Antibodies, 218, 303, 311, 514 

 Anticoagulin, 217 

 Antienzyme, 217 

 Antigen, 632 



Antitoxin, diphtheria, 632 

 Antitoxins, 489 

 Ants, 549 

 Anura, 109 

 Aorta, 309 



Aortic arches, 308, 309 

 Aortic plexuses, 354 

 Ape-man, 565 



Apes, 115, 233, 514, 535, 5S8, 539, 

 544, 551 



experiments with, 386-387 

 Aphids, 413 



Apical nervous system, 343 

 Apoda, 109 

 Appendages, 329 

 Appendix, 292 

 Apterygiformes, 113 

 Aqueduct, 350 

 Aqueous humor, 360 

 Arabs, 561 

 Arachnoidea, 102 

 Arachnoid membrane, 345 

 Arbacia, 95 

 Arbor vitae, 350 

 Arcella, 77 

 Arcellidae, 328 

 Archaeopteryx, 113, 506, 507 

 Archaeornithes, 113 

 Archegonia, moss, 175, 176 

 Archenteron, 4^8 

 Archeozoic era, 475, 476, 513 

 Archiannelida, 93 

 Arctic tern, migi'atioii of, 38 

 Aristotle, 437 

 Armadillo, 115, 508 



Armbruster, L., 208 

 Armenians, 561 

 Armenoid races, 561 

 Armor, protective, 493 

 Arms, evolution of, 544 

 Arteries, 304, 305 



Ai-thropoda, 67, 68, 99, 103, 328, 334, 

 336, 344 



structure of, 199 

 Arthropods, 234 



parasitic, 222 

 Artifacts, 479, 554 

 Artificial light, relation to food-making 



in green plants, 259-260 

 Artiodactyla, 117 

 Ascaris, 423 



infection by, 617 

 Ascaris lumbricoides, 225 

 Ascaris megalocephala bivalvens, 428 

 Ascidians, 105 

 Ascomycetes, 71, 73 

 Asexual development, in Hydi'a, 184 

 Asexual propagation, 455 

 Asexual reproduction, types of, 410- 



411 

 Ash, plant residue, 242, 254 

 Associations 



plant and animal, 5-20 



maple-birch, 28 

 Asteroidea, 95 

 Asthma, 394 

 Astrangia, 81 

 Astronomy, 473 

 Atwater, 276, 312 

 Auchter, E. C, 249 

 Auditory nerve, 352, 361 

 Augustine, Saint, 494 

 Aurelia, 81 

 Auricle, 308 

 Aurignacians, 557, 560 

 Autonomic nervous system, 354, 355 

 Autosomes, 469 

 Autotomy, 410 

 Aves, 103, 113 



Axial filament, sperm, 415, 416 

 Axial gradient theory, 365, 381, 431 

 Axon, 340, 359 

 Azeel fowl, 515 

 Aztecs, 562 



Baboon, 508, 537 

 Bacillus, 71, 165 

 Backbone, curvature of, 54-2 

 Bacteria, 69, 71, 216 



aerobic, 59 



anaerobic, 59 



ecological adaptations in, 490 



forms of, 165 



how they enter the body, 622 



