INDEX 



435 



Corn, production, 326, 327; 



stem, 89, 90; 



tests, 54, 55, 59. 

 Corolla, 31, 32. 

 Corpuscles, blood, 163, 164 ; 



colorless, 163, 164, 168, 174, 175. 

 Cotton, 2, 330. 

 Cotton-boll weevil, 362, 363. 

 Cotyledons, 52, 56. 

 Cowpox, 274. 

 Cows, 392. 

 Crab, 241, 350. 

 Cranium, 114. 

 Cretinism, 166. 

 Cricket, 27. 

 Crocodile, 246, 366. 

 Crocodilia, 247. 

 Crops, rotation of, 341, 342. 

 Cross-pollination, 35-39. 

 Croton bugs, 295. 

 Crow, 359, 360. 

 Crustacea, 242, 349. 

 Ctenophora, 240. 

 Culex, 279, 280. 

 Culture medium, 254, 

 Cushing, Dr. Harvey, cited, 167. 

 Cuts and bruises, treatment, 175. 

 Cutworm, 362. 

 Cycads, 237. 



Dairies, 4. 



Dandelion leaves, 80. 



Darwin, Charles, life, 411, 412; 



on heredity and variation, 383, 384 ; 



on pollination, 36. 

 Decay, caused by bacteria, 339, 



340. 

 Deforestation, result of, 314. 

 Dendrites, 198. 

 Department of Agriculture, 365, 390, 



391. 

 Dermis, human, 112. 

 Determiners of characters, 381. 

 De Vries, Hugo, 385, 413. 

 Diabetes, 168. 

 Diaphragm, 116, 147, 180. 

 Diastase, 60. 

 Diatoms, 236. 

 Dick test, 273. 

 Dicks, investigators, 411. 



Diet, daily fuel needs, 132-134; 



mixed diet, 132 ; 



properly balanced, 134 ; 



relation of age to, 129 ; 



relation of appetite to, 130 ; 



relation of cost of food to, 130 ; 



relation of digestibility to, 129, 130 ; 



relation of environment to, 128 ; 



relation of sex to, 129 ; 



relation of work to, 128 ; 



relation to kidneys, 188 ; 



table of 100-Calorie portions, 135. 

 Dietary, 120-137. 

 Diffusion, explained, 70; 



physiological importance, 73. 

 Digestibility of foods, 129, 130. 

 Digestion, in animals, 61, 110; 



in man, 116, 147-160; 



in plants, 60, 61, 91, 92, 93, 146; 



purpose of, 146-147. 

 Digestive tract of frog and man, 



147. 

 Dihybrids, 389. 



Diphtheria, 263, 269, 272, 273. 

 Dipnoan, Dipnoi, 245, 246. 

 Diptera, 27, 242. 

 Disease, cause of, 254; 



caused by bacteria, 3, 260-266 ; 



caused or carried by animals, 278- 

 290; 



communicable and uncommuni- 

 cable, 216, 268; 



germ or infectious, 261 ; 



how communicated, 261 ; 



immunity to, 270-276 ; 



incubation period, 269, 270; 



infectious, 254, 261 ; 



relation to alcohol, 140, 142 ; 



resistance against, 271 ; 



resisted by antibodies, 165. 

 Dishes, washing of, 295. 

 Disinfection, 259. 

 Division of labor, physiological, 108- 



109. 

 Dogs, 391 ; 



skeleton, 243. 

 Domesticated animals, 353, 391, 392. 

 Dominance, law of, 388. 

 Dominant characters, 388, 389, 397. 

 Dorsal, 243. 



