INDEX 



Numbers refer to pages 



Aberration, chromatic and spherical, 15 



Abiogenesis, 8, 165 



Absorption, 57, 144. (See also Diges- 

 tion.) 



Acanthocephala, classified, 270, 274 



Acarina, classified, 270 



Accessory organs of genital systems, 128 



Accessory respiratory organs, 123 



Acetabulum, 138 



Achromatic figure, 73, 76 



Acids, glandular secretions, 154 



Actiniaria, classified, 269 



Actinomorphes, 262 



Actinophrys, 81 



Actinosphserium, 81 



Actions, automatic, 161, 163; reflex, 161, 

 162 



Actitus macularia (see Spotted sand- 

 piper) 



Adaptation, 356; color, 280; not purpose- 

 ful, 277; physiological, 276; struc- 

 tural, 275 



Adrenal glands, secretions of, 154 



.5<]pyornithiformes, classified, 271 



Afferent fibers, 142 



African elephant, 323 



Agassiz, Louis, 263 



Age, of amphibians and lycopods, 315; 

 of fishes, 315; of invertebrates, 315; 

 of mammals, 315; of modern floras, 

 315; of reptiles, 315, 332; of unicellu- 

 lar life, 315 



Alanine, 51 



Albumen in salivary secretion, 144 



Alcohols, 187 



Alcyonacea, classified, 269 



Alcyonaria, classified, 269 



Aldehyde, 187 



Alexander the Great, 8 



Alimentary canal, control of, 163 



Alimentary system, 95 



Alligator, range of, 289, 291 



Alpaca, 329 



Alternation of generations, 186 



Altricial forms, 201, 203 



Alveolar gland. 111 



Alveoli, 35, 36 



Amber, fossils in, 310 



Ambystoma, congregation of sexes, 192; 

 fertilization in, 192 



Ambystoma tigrinum, 183 



Amino-acids, 39, 50, 51, 145, 146; absorp- 

 tion of, 147 



Amino radical, 51 



Amitosis, 80-81; limited occurrence of, 

 80, 81; in Protozoa, 81; in regenera- 

 tion, 81 ; in reproductive tissues, 81 



Ammonia, excretion of, 151 



Ammonites, 331, 333; sutures of, 330 



Amoeba, 60, 61, 62, 66, 68, 85, 91, 93, 107, 

 175; classified, 271 



Amaba diplomitotica, 81 



Amoeba proteus, 61, 62 



Amoeba verrucosa, 61 



Amoeboid movement, 60, 61, 62, 73, 171 



Amphiaster, 72, 76 



Amphibia, 184, 331, 335; age of, 315; 

 classified, 271, 274; congregation of 

 sexes, 192; copulation in, 192, 193; 

 fertilization in, 192, 194; hermaph- 

 roditism in, 191; in red beds, 319 



Amphibious animals, disposition of eggs, 

 204; fertilization in, 194; method of 

 bearing young, 198; parental care 

 in, 204 



Amphibious mammals, range of, 292 



Amphicoelous vertebrae, 137 



Amphidisc spiciiles, 170 



Amphineura, classified, 269, 273 



Amphioxus, 115, 223; classified, 273; 

 gastrulation in, 220; mesoderm for- 

 mation in, 222 



Amphipoda, classified, 270 



Amplexus, 190, 192, 193; in Bufo ty- 

 phonius, 193 



Amylene, 187 



Amylolytic enzymes, 56 



Amylopsin, 56, 145, 146 



413 



