458 



INDEX 



Antibody, 338 



Antitoxin, 338 



Antlers, 206 



Ants, instincts, 343; associated 



with Aphids, 333 

 Anus, 121, 153 

 Aorta (see Dorsal and Ventral 



aorta) 



Aortic arches, 171 

 Aphids and Ants, 333 

 Apis (see Bee) 

 Aqueous humor, 201 

 Arabian scientists, 383 

 Archaeopteryx and Pigeon, 360 

 Archegonium, 101, 104 

 Aristotle, 2, 15, 209, 379, 380, 383, 



390, 394, 398, 401, 406 

 Arterial system, 166 

 Arteries, 163-1 65; pulmonary, 



150, 151, 152 

 Arterioles, 163 

 Arthropoda, 129; classification, 



415; structure of primitive, 180 

 Artificial parthenogenesis, 249 

 Ash, 80 

 Asparagine, 36 

 Asparagus, 70 

 Aspidium, 103, 104 

 Associations, communal, 331 

 Aster, 225 

 Atavism, 269 

 Auditory capsule, 145 

 Auditory nerve, 197, 198 

 Aurelius, Marcus, 44, 382 

 Auricle, 163, 172 (see Circulation) 

 Autonomic nervous system, 186, 



191, 192 

 Azalea, 75 



B 



Babylonian science, 379 

 Bacillus tetani, 311 

 Bacon, R., 386 



Bacteria, 44-53; discovery, 388; 

 chief types, 45] denitrifying, 49; 

 as food, 42; nitrate, 48; nitro- 

 gen-fixing, 49, 333; nutrition, 

 50; reproduction, 46; sulfur, 

 309; types of flagellation, 46 



von Baer, 1, 402 



Balanced aquarium, 53 



Barberry, 72 



Bark, 88 



Barley, 80 



Barnacle, 115 



de Bary, 7 



Bat, 318; wing skeleton, 352 



Beagle, voyage of, 369 



Bean, 66; inheritance in, 300; 

 section of stem, 81 



Beaver, 349 



Bee, 325, 415; head, 826] in- 

 stincts, 343; legs, 324-329; 

 parthenogenesis, 249; pollina- 

 tion by, 330 



Bee-fly, 323 



Bernard, 91 



Bibliography, 417-428 



Biennial plant, 67 



Bilateral symmetry, 124 



Bile duct, 137, 148, 151, 152, 155 



Binomial nomenclature, 391 



Biochemistry, 5 



Biogenesis, 210, 388 



Biogenetic law, 364, 403 



Biological sciences, 5 



Biology, 1; divisions of, 4; his- 

 tory, 379-411; and medicine, 

 381; scope of, 1-5 



Biophysics, 5 



Biparental inheritance, 251 (see 

 Inheritance) 



Biramous appendage, 132 



Bird, 117, 136; brain, 189; circu- 

 lation, 165; dissection of, 151; 



