Compound eye, 14, 15, 290 

 Compound leaves, 43 

 Concentration and osmosis, 124 

 Conditioning, 266 ff., 316, 670 ff. 



Conflicts, 670 ff. 



Conjugation, 374, 375 



Connectors, 275 



Conservation, of forests, 590 ff. ; of soil, 156, 

 645 



Convolutions of brain, 281 



Convulsions, 124 



Copper, in hemocyanin, 102 



Copperhead, 4 



Corals, 692 



Cork ceUs, 91, 147 



Corms, 372, 395 



Corn, 12 ; stem of, 146; hybrid, 498, 499 



Corn borer, European, 655 



CoroUa, 401, 402 



Corpuscles, red, 186, 189; white, 188 



Correns, Karl (1864-1933), 479 



Cortex, of root, 143, 144; of cerebrum, 

 279 ff., 283 ; of adrenals, 307 



Cortin, 307, 314 



Cotton aphid, 655 



Cotyledon (kot i le'dzm), 145, 415 



Cow, stomachs of, 174; teeth of, 176; milk 

 production by, 651 



Cowpox, 235 



Crab, 92, 391 



Creation, special, 446 f . 



Cretinism (kre'tm iz'm), 306, 309, 311 



Crocodiles, 211, 696 



Cro-magnon (kro ma nyon') man, 52, 57 ; 

 brain of, 297 



Crop, in bird, 173, 176 



Crops, rotation of, 151 f.; damage to, by 

 insects, 655 



Crossing over, 494 



Cross-poUination, 407 f. 



Crustaceans, 101, 693 ; balancing organ of, 

 285 ; modification of, 357 ; sexual dimor- 

 phism in, 391 



Crystalloids, 163 



Cud-chewing animal, 174 



Cultivation, of plants, 83, 155 



Cultures, 429, 519 f. 



Cuttings, 370, 373 



Cuvier, Georges (1769-1832), 176, 447 



Cycle, carbon, 148 f.; oxygen, 148; nitro- 

 gen, 14© S. 



Cypress, 204 

 Cysts (sists), 370 f. 

 Cytolysins (si tol'i sinz), 242 

 Cytoplasm, 368 



Dandelion, 12 



Darwin, Charles (1809-1882), 461, 464^ 

 466 £f. 



Davenport, Charles B. (1866-1944), 483 



Davy, Humphry (1778-1829), 659 



Death, 20, 527 ff. ; rates of, 605 f. 



Deficiencies, nutritional, 100, 104 ff. ; of 

 ductless glands, 306 f . 



Deficiency diseases, 104 ff., 133 



Deforestation, 645 



Democracy, 71 



Dendrites (den'drlts), 25, 275 f. 



Dermis (dur'mis), 217 



Descartes, Rene (1596-1650), 262 



Descent, 35 ; continuity of, 464 



Development, influence of thyroid on, 309 -, 

 irregularities in, 335; of chicks, 350; of 

 frog, 351 ; similarities in, 354; conditions 

 for, 357 ff. ; changes in, 450 ; of verte- 

 brates, 459 



Diabetes, 195, 307, 312 f. 



Diaphragm, 205, 206 



Diastase (di'a stas), 163 f. 



Dicots (dl'kots), frontispiece, 145, 147, 691 



Diet, minerals in, 123; planning a, 124 ff.; 

 shares of nutrients in, 126 f. 



Differentiation, 61 ff., 351, 357 ff. ; lines of, 

 417 f. 



Diffusion, 85 ff. 



Digestion, 163 f . ; in man, 165 ff. ; intestinal, 

 168 



Dimorphism (dl mor'fiz'm), sexual, 391 



Diphtheria, 233 f., 235, 239, 240; carriers 

 of, 245 



Diploid (dip'Ioid), number, 386 



Diseases, specific tests of, 242 ; communi- 

 cable, 617 ; organic, 631 



Distribution, geographic, 460 ff. 



Division, of cells, 25, 344 ; nuclear, 368 ; of 

 labor, 529 ff. 



Dobson fly, 209 



Dog, teeth of, 177 ; conditioning of, 266 ff. ; 

 brain of, 281 ; pancreas of, 303 



Dominant characters, 475 ; in plants, 480 ; 

 in animals, 481 ; in man, 500 



Dorsal root, 279 



708 



