Centrosome, 4S8 



Cereals, 84-85 



Cerebellum, 271-273; functions of, 273; human, 271; 

 of vertebrates, 273 



Cerebral hemorrhage, 217 



Cerebrospinal fluid, 272 



Cerebrum, 271-274; functions of, 272-273; and 

 hearing, 282; human, 271; of sheep, 271; of 

 vertebrates, 273 



Chalk cliffs, 64 



Chance, effect on heredity, 466-467 



Chaos chaos, 64 



Character (see Characteristics) 



Characteristics, acquired, 487-490, 560; of amphibi- 

 ans, 30-31; of animals, 15-71; of arthropods, 41- 

 53, 41; of bacteria, 311-312; of birds, 20-26, 21; 

 and breeding, 493-507 ; and chromosome changes, 

 481-483, 482; and chromosomes, 466-467; in 

 classification, 95-103; of coelenterates, 58-60; of 

 crustaceans, 52-53; dominant, 467-468; of early 

 man, 566-570; of echinoderms, 55-56; and en- 

 vironment, 485-491, 486, 488, 490; of ferns, 79- 

 80; of fish, 31-34, 32; of flowering plants, 80-90; 

 heredity of, 454-519; heredity in fruit fly, 471; 

 of human races, 573-577; table, 574, 575; in- 

 herited in man, 508-513; of insects, 41-50, 45; 

 of invertebrates, 39-71; and laws of heredity, 

 468-473; linked, 472; of mammals, 16-20; of mol- 

 lusks, 53-55; of mosses, 78; of plants, 72-94; and 

 mutation, 479-481, 480; of protozoa, 61-64; re- 

 cessive, 468; of reptiles, 26-30, 29; secondary 

 sexual, 421-422, 421, 435; sex-linked, 473; of 

 spiders, 50-51; of sponges, 61; of thallophytes, 

 73-78; of tissues, 129-133; and variation, 485- 

 492; of vertebrates, 15-39; of viruses, 339-340; 

 of worms, 57-58 



Chemical, action, 110; change, def., 189; energy, 

 120; "messenger," 200, 246-258; regulators, 246- 

 258; resemblances, 550 



Chemicals, and bacteria, 315 



Chemistry, 108 



Chemotropism, 302 



Chest, 121; in breathing, 228; change in size, 228- 

 229; expansion, 228 



Chewing, of food, 192 



Chickadee, 25 



Chicken, 177; cholera, 323-324; chromosome num- 

 ber of, 459 



Chickenpox, 340 



Chigger, 51 



Children, and gonorrhea, 333; and learning, 293- 

 294; and syphilis, 332-333; vaccination of, 331 



Chilopoda, 66 



Chimpanzee, 16; and reasoning, 295-296; trained, 

 274 



Chinch bug, 392-393 



Chitin, 41 



Chlorine, 109; and water supply, 345 



Chlorophyll, 106, 111, 139, 142, 143; composition 

 of, 139-140 



Chloroplasts, 106, 111, 139, 139-141 



Cholera, in chickens, 323-324; epidemic, 343; spiril- 

 lum of, 312 



Cholesterol, and vitamin D, 181 



Chordates, 15 



Choroid coat, of eye, 280, 280 



Chromatin, 107, 111, 457; in cell division, 456-459, 

 457, 458; def., 456 



Chromosome, def., 456-457 



Chromosome changes, effect of, 483 



Chromosome number, def., 459; significance of, 459 



Chromosomes, 457, 458; changes in, 481-482; and 

 fertilization, 461-462; giant, 474; and heredity, 

 459; map of, 470; in reduction division, 461; and 

 sex, 472-473; sphtting of, 457-458; X, Y, 473 



Chronic alcoholics, 366-367 



Chrysalis, 42 



Cicada (17-year locust), 49 



Cilia, 62, 63; of epithelium, 227; of Paramecium, 62 



Cinchona, 89 



Circulation, diagrams of blood, 218, 219; in man, 

 206-225 



Circulatory diseases, 361 



Circulatory system, blood, 206-220; lymph, 206, 

 220-225; main, 207; pulmonary, 219; systemic, 

 218 



Circus giant, 247, 253-254 



Citric acid, and resemblances, 550 



Citrus fruits, in diet, 178 



Civilization, and ecology, 387 (see Culture) 



Clam, 53, 54, 55 



Class, def., 15, 99 



Classes, of arthropods, 41-53, 41; of coelenterates, 

 60; of echinoderms, 56, 56; of moliusks, 53-55, 

 75, 76, 78; of plants, 91; of vertebrates, 16-39, i6 



Classification, 95-103; of animals, 15-66; of coins, 

 95-96, 96; explanation of, 551; of gray squirrel, 

 100; Linnaeus' scheme of, 97-101; of man, 564, 

 573-576, 574, 575; outline of animal kingdom, 

 65-66; outline of plant kingdom, 90-91 ; of plants, 

 73-91, 101; principles of, 95-96, 101; and re- 

 semblances, 551; of stamps, 95 



Clay, 148 



Cleanliness, and health, 348 



Cleavage, def., 425, 425 



Cliff dwellings, 572 



Clothes moth, 395 



Clotting, of blood, 210-211; diagram, 211 



Clover, 86-87, 87 



Club mosses, 80, 91 



Coal, 383; and carbon cycle, 376; formation of, 527, 

 536-537; fossils in, 527 



Coat color, heredity in cats, 465 



Cobra, 29 



Cocci, 312 



Coccyx, 548 



Cochlea, of ear, 281-282, 281 



Cockroach, of Carboniferous period. 536 



Coconut palm, 85 



Cocoon, def., 42; silkworm, 43 



Cod liver oil, 181 



Codling moth. 393-394; control of, 395; life iiisJory 

 of, 394, 394 



Coelenterates, 58-60 



Coffee, 88; 89 



Cohn, Professor Edwin, 212 



Colchicine, and chromosome number, 482 



Cold-blooded, def., 26 



Colds, 340, 364 



Collecting living things, 5 



Colon, 188 



Colony, of bacteria, def., 313; 314; and bacterial 

 variation, 338 



Color blindness, heredity in man, 473 



Colorado [lotato beetle, 46 



Community, and disease, 343-347 



Companion cell, 153 



Comparative anatomy, def., 548 



Composite family, of plants, 89-90, 89 



Compound leaf, 89 



Compounds, 109 



Conditioned responses (reflexes), 9 10, 288 289 



602 



