516 



INDEX 



Appendages of crayfish, 96, 105, 106, 



356 

 Appendicular skeleton, 142, 143 

 Apple, 408 



Applied science, 386, 388 

 Aptera, 92, 94 

 Apteryx, 124 

 Aqueous humor, 215 

 Arachnoidea, 95 

 Arcella, 48 



Archaeopteryx, 123, 361, 362 

 Aristotle, 2, 23, 188, 218, 251, 446, 



449, 451, 456, 462, 464, 466, 471, 



472 

 Armadillo, 128, 129 

 Army worm moth, 408, 415 

 Arterial system, 171-177 

 Artery, 105, 170-179 

 Arthropoda, 90-97, 104-109, 130, 



215, 478 

 Artificial parthenogenesis, 260, 261 

 Artificial selection, 378-384, 473-476; 



See: Selection 

 Artiodactyl, 130 

 Ascaris, 80, 396 

 Ascon, 69, 70 



Asexual reproduction, 57; See: Bud- 

 ding, Regeneration, Reproduction, 



and Schizogony 

 Associative memory, 347 

 Aster, 240, 241 

 Asteroidea, 86 

 Astronomy, 2 

 Atlas, 142 

 Atmosphere, 320 

 Auditory nerve, 212, 213 

 Audubon Societies, 419 

 Aurelia, 73-75 



Autonomic system, 201, 205, 208, 209 

 Autotrophic, 33, 42 

 Aves, 123-126 

 Avoiding reaction, 344 

 Axon, 200 



Baboon, 131 

 Babylonian science, 446 

 Bacillus, 38, 39; See: Bacteria 

 Backbone, 111; See: Skeleton 

 Bacon, 452 



Bacteria, 38-45, 158, 220-223, 318, 

 319, 342, 343, 391, 402-404, 407, 

 453; denitrifying, 45; nitrite, 45; 

 nitrogen-fixing, 42, 338 



Badger, 321 



von Baer, 1, 467, 468 



Balanced aquarium, 45; See: Web of 

 fife 



Balantidium, 396 



Barley, 409 



Barnacle, 91 



Bat, 128, 129, 321, 324, 355 



Bath sponge, 69, 70 



"Beagle," voyage of, 372 



Bean, inheritance, 380, 381 



Bear, 129, 321, 352, 367 



Beaver, 129, 323, 352 



Bee, 93, 94, 327-336, 346, 414 



Bee-fly, 329 



Behavior, 253, 314, 343-348 



Belief, 228 



Beri-beri, 159 



Bibliography, 481-491 



Bilateral symmetry, 78, 104, 132 



Bile, 154; duct, 133, 146, 148, 154, 

 155, 398 



Binary fission, 50, 56, 188, 229, 230, 

 255 



Binomial nomenclature, 353, 457 



Biochemistry, 5, 366, 403 



Biocoenosis, frontispiece, 494 



Biogenesis, 218-228, 454 



Biogenetic law, 364-366, 468 



Biological sciences, 3, 4 



Biology, 1-6, 466 



Biophysics, 5 



Biosocial reactions, 437, 444 



Biparental, 274 



Biramous, 106, 107 



Bird, 111, 123-126, 204, 251, 253, 319, 

 325, 355, 361, 362, 365, 369, 372, 

 376, 419, 420, 479 



Birth, 191, 192, 194 



Bison, 419, 441 



Bivalve, 87-89 



Bladderworm, 399, 400 



de Blainville, 23 



Blastocoel, 60, 264, 266, 268 



Blastoderm, 253, 272 



Blastopore, 60, 264, 266, 268 



Blastostyle, 72 



Blastula, 60, 98, 263, 264, 266, 268 



Blending inheritance, 287, 297-301 



Blind spot, 215 



Blood, 11, 15, 64, 165, 166, 169-179, 

 182, 192, 367, 430, 452, 454; corpus- 

 cles, 11, 28, 64; pressure, 176, 177; 



