INDEX 



Note. — References to pages on which a figure appears are in bold face type. However, if a reference 

 covers two or more pages, no indication of figures is given. Any outstanding reference in the text, 

 when occurring among several, is in italics. If two or more references to the same page exist the page 

 number is not duplicated. 



Abalone, 224 

 Abdomen, crayfish, 255 



insect, 277, 280 



spider, 302 

 Abdominal cavity, 323 

 Abiogenesis, 270 



Abnormalities, inheritance of, 564 

 Abomasum, 441 

 Abscess, 519 

 Absorption, 33, 35, 488 

 Abundance rhythms, 510 

 Abyssal fauna, 511 

 Acanthias, 344 

 Acanthocephala, 180, 185 

 Accommodation, 338 

 Accretion, 18 

 Acetabulum, 327 

 Acidity, 507 

 Acids, 8 



cyanic, 27 



fatty, 35 

 Acinous glands, 468 

 Acipenser rubicundus, 351 

 Acontia, 148 



Acquired characters, inheritance of, 545, 549 

 Acquired immunity, 519 

 Acropara, 154 



Actinosphaerium eichhorni, 81 

 Action pattern, 500 

 Adambulacral plate, 196 

 Adaptation and adaptations, 168, 172, 365-369, 



382-384 

 Adelochorda, 314 

 Adhesive papillae, tunicate, 318 

 Adjustment (.see Adaptation) 

 Adjustor, 496, 498 

 Adolescence, 45, 460 

 Adrenal bodies, 373 

 Aedes, 292 

 Aeolosoma, 249, 253 

 Aepyornis, 409 

 Aerial types, 512 

 Aeronautic spiders, 305 

 Afferent fiber, 244 

 Afferent impulse, 165, 333 

 Afferent path, 243 

 Afterbirth, 447 

 Aftershaft, 405 

 Age immunity, 519 



Ages, of fishes, 362 



geological, 540 

 Agnatha, 341 

 Air bladder, 354 

 Air sacs, 281, 407 

 Albino crow, 550 

 Albumen, egg, 383 

 Alder flycatcher, 609 

 Alexander the Great, 579 

 Alimentary canal, 179, 186, 198, 327, 466 



of man, 328 

 Alkalinity, 507 

 Allantoic cavity, 384 

 Allantoic placenta, 430, 447 

 Allantoic stalk, 384 

 Allantoic vessels, 386 

 Allantois, 384, 447 

 Allelomorphs, 556 

 AUergy, 517, 520 

 Alligator gar, 351 

 Alligator mississippiensis, 399 

 Alligators, 387, 399 

 Alligator's brain, 387 

 Alternation of generations, 108 

 Altitude, effect on distribution, 530 

 Altricial young, 418, 420 

 Alveolar connective tissue, 101 

 Alveolar structure of protoplasm, 23 

 AlveoH, lung, 370, 469 

 Amber, fossils, 538 

 Ambergris, 448 

 Ambulacral groove, 195 

 Ambulacral plates, 196 

 Ambulacral pores, 196 

 Ambulacral rows, 206 

 Ambystoma, 380 

 Ambystoma tigrinum, 371 

 Ameba, 33, 63-65, 66, 67, 68 

 Amebic dysentery, 88 

 Amebocytes, 200, 470 



Ameboid cells, 133, 330, 356, 376, 468, 490, 518 

 Ameboid movement, 494 

 American hookworm, 182 

 Ametabola, 283, 284 

 Amino acids, 20, 35, 329 



absorption, 36 

 Amitosis, 50 

 Ammocoetes, 342 

 Ammonoids, 541 

 Amnion, 383, 446 

 Amniotic cavity, 384 



615 



