INDEX 



[Figures in italics designate pages on which illustrations occur.] 



Abdomen, 130, 158 

 Abdominal cavity, 140 

 Abdominal pores, 207 

 Abdominal vein, 165 

 Abiogenesis, 209, 210, 388 

 Absorption, 87, 156, 158 

 Accessory chromosome (see X 



chromosome) 

 Acoelomates, 121 

 Acquired character, 266, 297, 306, 



377, 408, 409 

 Adam's apple, 153, 356 

 Adaptability, individual, 339-344 

 Adaptation, 11, 17, 18, 307-344, 



375; functional, 308-313; to 



living environment, 330-339; 



physical environment, 308-329; 



structural, 313-329 

 Adaptive radiation of Mammals, 



313-319 



Adaptive variation, 378 

 Adrenal body, 152 

 Adventitious roots, 67 

 Aerial roots, 66, 67 

 Afferent nerve, 192 

 Air bladder, 148 

 Air spaces, 83, 84 

 Alcoholism, 267 

 Algae, classification, 413 

 Alimentary canal, 121, 123, 131, 



137, 148-156; derivatives, 160 

 Alimentary system, 116 

 Allelomorphs, 276, 280, 282, 288 

 Alligator, brain, 189 



Alternation of generations, jj4? 

 100-114, 218-220, 229 



Alternative inheritance (see In- 

 heritance) 



Amines, 36, 87 



Amino acids, 13, 42, 158 



Amoeba, 9, 19, 116, 340 



Amphibian, 117, 136, 149, 189 (see 

 Frog) 



Amphioxus, 146, 259, 415; devel- 

 opment, 257] egg, 256 



Anabolism, 16 



Anaerobe, 311 



Analogous structures, 63, 130, 199 



Anaphase, 225 



Anatomy, 4\ comparative, 132, 

 351-356; history, 393, 394 



Ancestral inheritance, law of, 270 



Animal body, 115-153; versus 

 plant body, 115 



Animal, chief groups, 116, 117; 

 circulation, 161-174; classifica- 

 tion, 116, 117, 414-416; colora- 

 tion, 319-324; coordination, 

 181-202; excretion, 175-180; 

 metabolism, 39-43; nutrition, 

 154-160; reproduction, 203- 

 208; respiration, 161-174; ses- 

 sile, 115; unicellular, 39 



Annual plant, 66 



Antenna, 131, 132] cleaner, 326; 

 comb, 326 



Antennule, 131, 132 



Anther, 108, 110, 112 



Antheridium, 101, 104 



457 



