INDEX 



Bold-face numbers refer to pages on which illustrations occur. 



Abdomen, 222, 223 



Abducens nerve, 307 



Abiogenesis, 29 



A-B-O blood groups, 513 



Aboral, 270 



Absorption, 460, 466, 467 



Accommodation, 400, 401 



Acetabulum, 305, 306, 376, 381 



Acetylcholine, 428 



Achilles, tendon of, 304, 385, 386 



Achondroplasia, 613 



Acid, 29, 458, 459 



Acid-base balance, 515 



Acidosis, 488 



Acoela, 166 



Acorn worm, 281, 282, 283 



ACTH, 446, 449 



Actinophnjs sol, 127, 128 



Adaptation, 658, 664-667 



Adaptive radiation. See Evolution, divergent 



Addison's disease, 445 



Adductor magnus, 304 



Adenosine diphosphate, 389 



triphosphate, 389 

 Adhesion, 24 

 Adjustors, 410-429 

 Adrenal, 434, 444 

 Adrenalin, 444 

 Adrenin, 444 

 Adsorption, 24 

 Aesclia, 236 

 Aestivation, 88, 89 

 African sleeping sickness, 125, 126 

 Agglutinate, 511 



Agkistrodon mokasen. See Copperhead 

 Ainus, 3.59 

 Air, 485 



complemental, 482 



residual, 483 



supplemental, 482 



tidal, 482 

 Air bladder, 292, 293 

 Albinism, 591, 592 

 Alcaptonuria, 587 

 Alcohol, use of, 472-474 

 Allantois, 320, 533, 534 

 Allele, 587 



multiple, 596 

 Allelomorph. See Allele 

 Alligator mississippiensis, 324, 325 

 Alpine, 360 

 Alveolus, 477, 478 



Amaurotic idiocy, 613 

 Ambulacral system, 270 

 Amhijstoma tigriimm, 296, 297 

 Amino acid, 42, 464, 465 

 essential, 469, 519 

 non-essential, 519 

 Amnion, 320, 533, 534 

 Amoeba, 38, 109, 110, 383, 384, 451, 452, 476, 



491, 522 

 Amoebic dysentery, 129, 130 

 Amoebocytes, 271 

 Amphibia, 289, 294-320 

 Amphiblastula, 138, 139 

 Amphineura, 261 

 Amphioxus, 283, 285, 286 



embryology 562, 563, 567 

 Amphoteric, 42 

 Aniplexus, 299, 300 

 Ampulla, 269, 271, 408, 409 

 Amylopsin, 463, 464 

 Anabolism, 61, 518-519 

 Anaerobic, 389 

 Anaphase, 552, 553, 554 

 Anasa, 602 

 Anatomy, 16, 



comparative, 636, 637 

 Anaximander, 649 

 Animal distribution, 642-646 

 Anion, 28 



Anisogamy, 530, 531 

 Annelida, 185-199 

 Anopheles, 131, 132 

 Anoplura, 221 

 Ant, 242, 243 

 Antagonist muscles, 384 

 Antenna, 207, 208, 209 

 Antenna cleaner, 230, 231 

 Antennules, 207, 208, 209 

 Anthozoa, 153 

 Anthropoid, 351-361 

 Antibody, 509, 510 

 Antigen, ,509, 510 

 Antitoxin, 515 



Anus, 79, 211, 212, 225, 226, 302 

 An\il. See Incus 

 Aorta, pulmonary, 497 



systemic, 497 

 Aphrodita hastata, 189 

 Appendage, biramous, 210 



origin of, 287, 289, 290 



uniramous, 210 

 Appendix, vermiform, 454, 465 



703 



