INDEX 



Figures in boldface (black) indicate pages on which there are illustrations. Figures 

 preceded bv "def." indicate pages where definitions are found. 



Abdomen, bird, 21; grasshopper, 45; insect, 41 

 Abdominal cavity, 229 

 Abscess, 210 



Absorption, def., 124-125; def., 197; of food, 197- 

 198 



Accidents, 362-363; and alcohol, 367 



Acetic acid, and wine, 323 



Acne. 242-243 



Acquired characters, 487-488; and evolution, .'j.^9- 

 560; and heredity, 488-490 



Acquired immunity, 316; active, 324; passive, 328 



Acromegaly, 253 



Active immunity, 324, 327; against tetanus, 331 



Adaptations, 560-561 



Adenoid, 226 



Adolescents, and mental health, 368-369 



Adrenal glands. 238, 252-253 



Adrenin, 252-253 



Aeration, of drinking water, 345 



Afferent neuron, 278, 278 



African sleeping sickness, 349 



African tribe, and disease, 320 



Agar, 75, 313; plate, 314; slant, 313 



Agaricus, 73 



Age of Mammals, 538-539; scenes of, 539 



Age of Man, 539-540 



Age of Reptiles, 537; scene of, 537 



Age of Trilobites, 535-536 



Agglutinins, 316 



Agote, Dr. Luis, and blood banks, 212 



Agricultural Experiment Stations, 391 



Agriculture, U.S. Department of, 391, 402 



Air, in breathing, 226-227; changes of, in breathing, 

 231; gases in, 231 



Air conditioning, 242 



Air pressure, and breathing, 229—230 



Air sacs, 227, 228, 230-231 



Airplane, and insect control, 393 



Albino, def., 509; 510 



Albumen, 430; and pneumonia vaccine, 339 



Alcohol, 174, 366-367; and accidents, 367 



Alfalfa, 87 



Algae, 73, 76, 90, 375 



Alimentary canal, 188, 189; absorption in, 197; di- 

 gestion in, 188-198 



Allergy, and skin, 243; causes, 364-365; def., 364; 

 tests for, 365 



Alligator, 29-30; brain, 273 



Alternation of generations, def., 446; in fern. 445- 

 446; in flowering plant, 446-447; in moss, 447 



Amanita, 75 



Amber, fossils in, 528 



Ameba, 40, 62, 63-64, 118; behavior, 265-266, 266; 

 reproduction, 412-413, 413 



American Tree Association, 406 



Amino acids, 142, 190, 196, 199, 208: and diet, 174 



Amphibians, 30-31 (see Frog) 



Amylase, 196 



Anaesthetic, 367 



Anatomy, def., 548 



Ancon, sheep, 497, 498 



Andalusian fowl, heredity in, 468 



Anemia, 209; and hookworm, 354; in malaria, 351 



Anemone, sea, 59 



Angiosperms, 81, 91 



Animals, classiflcation table of, 65-66; man's use of, 



382; review of, 64-66; survey of, 15-71 

 Annelids, 57 

 Annuals, def., 80 

 Annual rings, 156-157, 156 

 Anopheles, 349; and malaria, 349-351 

 Anoxia, 233-234; def., 233 

 Antealer, spiny. 20 



Antenna (feeler), 41; of grasshopper, 45 

 Anther, 439; def., 441 

 Anthills, 47 



Anthrax, and immunity, 324; cause of, 321 

 Anthropologist, def., 575 

 Antibiotics, def., 334 



Antibodies, 316, 324, 338-339; and typhoid, 327 

 Antiseptic surgery, 332 

 Antiseptics, 315; for wounds. 333 

 Antitoxin, def., 316; and diphtheria, 328-329; and 



diphtheria deaths, 329; preparation, 328-329, 329; 



for tetanus, 331 

 Antivaccination movement, 326, 336—337 

 Ants, 46-47, 47; with aphids, 47; life cycle of, 47; 



tending mealy bug, 47 

 Anus, 188, 198 

 Anvil (bone of ear), 282 

 Aorta, 213, 218, 218 

 Apes, 16 



Aphids, 46, 47; reproduction of, 424 

 Appendage, bat. 549; cat, 549; def., 41; insect, 41; 



man. 547; monkey, 549; seal, 549; whale, 547 

 Appendicitis, 362 



Appendix. 188; in man, 550; in rabbit, 551 

 Apple, 444; and codling moth, 393-394; effect of 



spraying, 395 

 Aquarium, balanced, 378-379, 378 

 Arachnids (spiders), 50-51, 50, 51 

 Archaeornis, fossil, 538 

 Archaeozoic era, 533, 534 

 Aristotle, 96 



Arm, cells and tissues of, 129-130; of microscope, 113 

 Arsenic, and insects, 393; and syphilis, 332 

 Arteries, 206, 207, 207, 214; and blood movement, 



215; structure of, 215-216, 215 

 Arthropods, 41-53; examples of, 41 

 Artifacts, def., 564; Stone Age, 565 

 Artificial parthenogenesis, experiments in, 424 

 Artificial respiration, 232-233, 232; rocking method, 



233; Schaefer method, 232, 233 

 Aryan race, 576 



Ascorbic acid, 180-181, 183; in common foods, 173 

 Aseptic surgery, 332 

 Asexual reproduction, 412-415; def., 417; in fern, 



445-447 ; in flowering plant, 446-447 ; in moss, 447 ; 



by vegetative reproduction, 447—449 

 Assimilation, 143; def., 125 



Asthma. 228; and adrenin, 253; and allergy, 364 

 Atabrine, and malaria, 351 

 Athlete's fool, 311 

 Atoms, tagged, 250 

 Auditory nerve, 281, 282 



Auricle, def., 213; 213, 218, 219. 219, 220, 220 

 .\ustralian mammals, explanation of, 552 

 Autonomic nervous system, 270, 279, 279 

 Autopsy, def., 251 

 Auxin, 303-304; "artificial," 304 



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