INDEX 



463 



Corn, stigma of, 292. 301. 



strengthening fibers of, 231,* 266 



structure of grain of, 2, 3.* 



wandering of, 440. 



water in, 437. 



Xenia in, 311. 

 Corn, Sugar, endosperm of, 3. 



— seed-leaf of, 179. 

 Corolla. 288.* 

 Correlation, 79,* 359. 360. 

 Corrosive sublimate as disinfectant, 364. 

 Cortex. See Rind. 

 Corylus. See Filbert, Hazel. 

 Cosmos, cross-pollination, 304. 

 Cottonseed oil. See Oil, Cottonseed. 

 Cotyledons. See Seed-leaves. 

 Cover. See Seed cov* r. 

 Cow Wheat loves mild humus, 351. 

 Cowpox, 379. 



Cracks, seeds buried in, 69. 

 Crataegus. See Hawthorn. 

 Crocus, opening and closing of flower of, 



affected by heat, 296. 



storage of food in, 260. 

 Crops, dependence on water supply, 133. 



green, in crop rotation, 160. 



rotation of, 160, 161. 



white, in crop rotation, 160. 

 Cross-pollination, 301,302, 303,* 304,* 305,* 



306.* 

 Crossing, process of 430. 431,* 432. 



results of, 411,* 413.* 416,* 422,* 423,* 

 424,* 425,* 426,* 427,* 428, 429,* 434. 



species originate from, 451. 



utility of, 421. 

 Crude food. See Food, Crude. 

 Crust. See Soil crust. 

 Cucumber, Squirting, dispersal of seed of, 



321.* 

 Cucurbita. See Pumpkin and Squash. 

 Crystals, 232,* 254. 



Cultivation conserves soil moisture, 115,* 

 116,* 117, 125, 129, 133. 



should be adapted to depth of root, 135. 

 Cupra-ammonia as light filter, 265. 

 Currant, acid in, 315. 

 Curve of variation. See Variation , Curve 



of. 

 Cut. fever caused by, 262, 263. 



Cuticle, 197, 198,* 199,* 328. 334.* 



effect of light on, 345. 



of water plants, 339. 

 Cuttings, correlation in, 359. 



fever in, 262, 263. 



propagation by, 433. 



regeneration in, 257. 



soil required by. 262. 263. 



transpiration of. 282. 



treatment of, 263. 

 Cydonia. See Quince. 

 Cypress, wood of. 230. 

 Cytisus, 331, 332.* 



protection of, from drying, by sunken 

 stomata, 215. 



See, also, Broom. 



Dahlia, root pressure, 243. 



Daily movements of flowers, 295-298. 



leaves, 218.* 



Daisy, cross-pollination of, 304. 



European, 422. 



Field, 422, 423.* 



Japanese, 422, 425. 



Ox-eye, variation in, 417, 418,* 419.* 



Shasta, 422, 423,* 424.* 425,* 427. 



hybrids, 422, 423,* 424,* 425,* 427. 

 Dandelion, behavior of leaf of, 252. 



dispersal of seeds of, 322, 323. 



effect of saturated atmosphere on. 341, 

 342.* 



flowers of, arrangement of, 298. 



affected by light, 298. 



opening and closing of flowers of, affected 

 by light, 295. 



protection of pollen by, 295. 



root by, 162. 



stalks of, tissue tensions in, 269, 273.* 

 Darkness. See Light. 

 Darwin, on orchid pollination, 307. 



— origin of species, 441, 442. 



— self- vs. cross-pollination, 301. 



— soil formation, 109. 

 Date, germination of, 180.* 



fruiting of, 356. 



seed-leaf of, 180.* 



vitality of pollen of, 294. 

 Daucus. See Carrot. 

 Decay, 381-387. 



