INDEX 



(Illustrations are indicated by page numerals in bold-face type.) 



Abdomen, of insect, 25. 

 Abilities, natural, 402-403. 

 Absorption, of food, 157, 158. 

 Accommodation, of eye, 206. 

 Acetanilid, poison, 144. 

 Adam's apple, 178. 

 Adaptations, 19-20; 



in a bee, 33 ; 



in birds, 247 ; 



in frogs, 109 ; 



in mammals, 237, 249. 

 Adenoids, 182, 310. 

 Adrenaline, 167. 

 Adrenals, 167. 

 Adrenine, 167. 

 Adulteration, 138, 139. 

 Aedes, 281. 

 Agglutinin test, 166. 

 Agglutinins, 165, 276. 

 Air, change of, 186 ; 



composition of, 8, 179 ; 



needed by man, 177 ; 



needed by plants, 57, 58, 82. 

 Alcohol, dangers from, 141-142 ; 



economic effect, 214; 



effect on the blood, 175 ; 



food, 139-140; 



in patent medicines, 143 ; 



poison, 140; 



relation to crime, 216 ; 



relation to efficiency, 215, 216 ; 



relation to heredity, 217. 

 Alg«, 223, 236. 

 Alimentary canal, 147. 

 Alligator, 366. 



Alternation of generations, 228. 

 Amino-acids, 120, 158. 

 Amoeba, 99, 100; 



and Paramecium, 108; 



receives stimuli, 193. 

 Amphibia, 243, 246. 



Amylase, 150, 155. 

 Anaerobic bacteria, 258. 

 Analogy, 238. 

 Ancon ram, 385. 

 Angiosperms, 237. 

 Animals, 98-100, 108-111; 



breeding of, 384, 385-389, 391, 392; 



cell, typical, 46, 49 ; 



classification of, 238 ; 



disease-causing, 278-290 ; 



diversity of form, 43 ; 



domesticated, 353, 391, 392 ; 



economic importance, 347-366 ; 



fibers, 353,354; 



food of man, 347-353 ; 



harmful, 278-290, 361, 362, 366; 



influence of environment, 14-21 ; 



organs and functions of the higher, 

 110; 



primary needs, 107 ; 



relation to man, 3-4, 5, 278-290, 

 347-366; 



relation to plants, 4, 30-31, 35, 40, 

 102-106; 



reproduction in, 220, 222, 226-232 ; 



responses in, 192-193, 195, 196 ; 



simplest, 95; 



summary of the functions, 92-94 ; 



unselfishness, 6. 

 Annual rings, 88. 

 Annulata, 240, 241. 

 Anopheles, 279, 280. 

 Antennae, 26, 196. 

 Anther, defined, 32. 

 Anthrax, 266, 271. 

 Antibodies, 165-166, 271, 272, 276; 



effect of alcohol, 175. 

 Antiseptics, used by Lister, 410. 

 Antitoxin, 272, 273, 274. 

 Anura, 246. 

 Aorta, 170. 



431 



