Bronchial tubes, 204, 205 



Bryophyllum, regeneration in, 231 



Bryophytes (bri'6 fits), frontispiece, 689 f. 



Bubonic plague, 619, 625 



Budding, 369 



Butler salts, 196 



Bulbs, 395 



Burbank, Luther (1849-1926), 497 



Burning of food materials, 83 



Butterfly, 350 



Cabbage, epidermal cells of, 87 



Caecum (se'kr<m), 174 



Calcium, 97, 98, 123 ; and parathyroids, 

 100; and heart action, 124; in flour, 128 



Callus, 229 



Calorie, 116 



Calorimeter, respiration, 118, 120 



Calosoma (kal 6 so'mc) beetle, 594, 596 



Cambium (kam'bi um), 146, 147; in grafts, 

 369 



Camerarius, Rudolf J. (1665-1721), 389 



Canadian zone, 563 



Cancer, 230 



Canines, 177 



CapiUaries, 189, 190 



Carbohydrates, 98, 125 ; energy value of, 125 



Carbon, in protein, 97 



Carbon cycle, 148 ff. 



Carbon dioxide, in air, 84 ; as raw material, 

 85, 138 ; test for, 93 ; and heartbeat, 302 



Caries (ka'ri ez), 102 



Carnivores (kar'ni vorz), 150, 151, 698; 

 teeth of, 177 



Carnivorous plant, 542 



Carotin (kar'6 tin), 110, 132 



Carpels, 398, 399 



Carriers, disease, 245 



Cartier, Jacques (1491-1557), 103 



Cartilage cells, 348 



Casein (ka'se in), 97 



Catkin, 408 



Cattle, selenium poisoning of, 102, 103 ; and 

 ticks, 346 



Caucasian, 63 



Cells, 20 ff. ; division of, 10, 368 ; variety of, 

 24, 25 ; multiplication of, 24 f. ; diffusion 

 between, 85 ff. ; epidermal, 87 ; gas ex- 

 change of, 201 f . ; nerve, 273 ff. ; growth 

 of, 343 ff. ; differentiation of, 348 ; fusion 

 of, 374 ff. 



Cellulose (sel'u los), 84, 86 



Centipedes, 693 



Central cyhnder of root, 143, 144 



Cerebellum (ser e heViim), 281, 283 



Cerebrum (ser'e br«m), 279 ff. ; functions of, 

 283 



Cesspool, 631 



Characters, in heredity, 475 ; combinations 

 of, 477 f. ; sex-linked, 488 



Chemical influences on development, 357 f., 

 360 



Chicken, tissue of heart of, 323 ; develop- 

 ment of, 350 



Chimpanzees, 699 ; brain of, 297 



Chin, human, 50, 52 



Chlorophyl (klo'rofil), 138, 141 



Chloroplasts (klo'ro plasts), 27, 215 



Chordates, food tube of, 173, 695 



Chromatin, 368, 389 



Chromosomes, 368, 376, 389 ; and inherit- 

 ance, 486 ff. ; and linkage, 488 ; numbers 

 of, 488 ; in man, 491 ; maps of, 491 



Cities, biological problems of, 6 ; health 

 differences among, 600 



Civilization, 72, 430 



Clams, 92, 209, 695 



Classes of plants and animals, 38, 688 ff. 



Classification, 29 ff. ; basis of, 34 ff. ; of 

 plants and animals, 687 ff. 



CHmate, influence of, 460, 462, 463 



Cloaca, 173 



Clotting of blood, 108, 133, 187 



Club mosses, 690 



Cocain, 659 



Coccus (kok'ws) group of bacteria, 242 



Cochlea (kok'lec), 286 



Cockroach, 350 



Cod-liver oU, 109 



Coelenterate (se len'ter at), frontispiece, 

 692 ; reproduction in, 382 



Coelocanth (se'16 kanth), 457 



Colchicine (kol'chisen), 513 



Colloids, 163 



Colonies, coral, 382 



Color blindness, 493 



Communicable diseases, 617; combating, 

 620, 626 ff. 



Communities, natural, 563 ff. ; formation of, 

 566 ff. ; climax, 568, 570 



Competition and struggle, 554 f. 



Composite (kom poz'it), 31 



707 



