INDEX 



Key : fate, pref ace, care, am, in f^nt, arm, ask, so id, eve, e vent, end, re cent, ev er, ice, ill, 

 old, 6 bey, orb, 6dd, con nect, food, foot, use, u nite, urn, up, cir cms 



Abdomen (ab do'men), of mammals, 14; of 



insects, 15 

 Absorption, by root, 142 ; of digested food, 



170f. 

 Accretion (akre'sh/m), 19 

 Acquired characters, 465 f. 

 Activities, energy needs for, 121 ff. 

 Adaptation, 20, 550 ; in plants, 255 ff. 

 Adenoid (ad'e noid), 205 

 Adjustments, 89 ff., 269 

 Adrenals (ad re'nalz), 305, 307 

 Adrenin (ad ren'in), 307, 313 

 Aeration (a er a'shfm) of soil, 83 

 Aesthetic values, 662 f. 

 Afferent nerve, 277, 282, 284 

 Agglutination test, 241 

 Agglutinin (a gloo'ti nin) , 242 

 Air, and seeds, 81 ; and life, 83 ; composition 



of, 84 ; and energy, 84 ; as rav^' material, 85 

 Air bladder, 173 

 Air-tubes, 207 

 Albumen, 97 

 Albumin, 220 



Alfalfa, tubercles of, 152, 203 

 Algae (al'je), frontispiece, 25, 688 f. 

 Alimentary canal, 165 

 "AlkaH disease", 102, 103 

 Alkaloids, 216, 231 

 AUergy (al'er ji), 242 

 Alligators, 211 



Alternation of generations, 383 ff. 

 Aluminum, 103 

 Alveolar glands, 170 

 Alveoli (al ve'6 h), 205 

 Ameba (cme'bc), 10, 23, 24, 25; digestion 



in, 164; functions in, 273 

 Amino-acids, in protein, 97, 123 ; as product 



of digestion, 169 

 Amphibians, 38, 696 ; red corpuscles in, 189; 



breathing of, 210 ; metamorphosis in, 355 ; 



reproduction of, 378 

 Ampulla (am piil'a), 287 

 Anaerobic (an a er ob'ik) organisms, 209 



Analogy, 458 



Anaphylaxis (an a fi lak'sis), 243 



Anatomy, 322 



Ancon ram, 509 



Anemia, 197 



Anemone (a nem'6 ne), sea, 92 



Anesthesia (an es the'zhic), 659 



Anesthetic, local, 659 



Anger, 316 f. 



Angiosperms (an'ji 6 spunnz), frontispiece, 

 691 



Animals, activities of, 17 ; cells of, 25 ; clas- 

 sification of, 41, 691 ff. ; predatory, 175; 

 excretion in, 216 ; removal of wastes from, 

 216 ff. ; heredity in, 481 ; breeding of, 498 



Annelids (an'e lidz), frontispiece, 693 



Anopheles (a nof'e lez), 621 



Antennae (an ten'e), 14 



Anther, 401, 403 



Antheridia, 384, 385 



Anthrax, 612 



Anthropoids, 699 



Antibodies, 236 



Antineuritic vitamin, 133 



Antirachitic (an ti ra kit'ik) vitamin, 133 



Antiscorbutic (an ti skor bu'tik) vitamin, 

 133 



Antiseptics, 618 



Antisterility factor, 133 



Antitoxin, 233 f., 236, 238, 239 



Aorta (a or'tc), 190, 191 



Apes, 699 ; and man, 53 ; characteristics of, 

 54 



Aphids (a'fidz), 595 



Appendages, of vertebrates, 48 



Appendix, 167, 174, 175 



Arachnid (a rak'nid), 693 



Arc, reflex, 277 



Arch, of fingerprint, 73 



Archegonia, 384, 385 



Arctic Alpine zone, 563 



Areas of brain, 283 



Argon (ar'gon), 84 



705 



