INDEX 



Abdomen, 317 



Absorption of food, 278, 325 

 Accommodation of eye, 404 

 Acids, 105 



characteristics of. 106 

 Adaptation of animals, 252 



of plants. 222 

 Adenoids. 354 

 Adrenal bodies. 368 

 Adrenalin, 368 

 Adult, 262. 267, 374 

 Adulteration of food, 307 

 Agassiz, Alexander, 130 

 Age of man, 295 

 Air, as matter, 2 



comparison of inhaled and 

 exhaled, 351, 352 



composition of, 121 



importance to plants and ani- 

 mals. o4."> 



-ae. 340 



storage by plants, 216 

 Alcohol as a stimulant, 330 

 Alimentary canal, of animals. 

 276 



of man, 310 



Ameba. 272. 279. 280, 282 

 Amphibians, 261 

 Anatomy, definition of. 296 

 Anchorage of plants. 222 

 Animal life dependent upon 



water, 115 

 Animals, adaptation of, 252 



change due to new conditions, 

 252 



classification of, 254ff. 



distribution of, 249ff. 



life processes in, 272ff. 



relation to man, 286ff. 



unable to maintain their 



ground, 251 

 Anther, 234 

 Anticyclone, 142 

 Antiseptics, 422 

 Antitoxin, 414, 416 

 Aorta, 340 

 Appendix, 318 

 Argon, 121 

 Arm, bones of, 372, 373 



muscles of, 379 

 Arteries, 339, 340, 342, 368 

 Arthropods, 264 

 Astigmatism, 405 

 Atmosphere, composition of, 

 121 



effect on earth's surface, 164 



importance of, 120 



moisture in. 124ff. 



pressure of, 129ff. 



properties and uses of, 121 



variations in, 120 

 Auditory canal. 406 

 Auricles. 338 



Bacteria. 243 



b. and disease, 245 

 conditions for growth of, 245 

 decay due to, 246 

 for diphtheria, 416 

 in lymph glands, 368 



431 



