558 



INDEX 



Dair>' cattle, inheritance, 402 



Darwin, Charles, 9, 420 



Damvin's theory, factors of, 421 



Davenport, C. B., 520 



De-aminases, 68 



Death, 7, 49, 249; an advantage, 

 255; immediate causes of, 253; 

 Weisman's theory of, 252 



Decay, 259 



Deciduous forest, 460 (fig.) 



Decomi)osition, 7, 259; agents of, 

 261; kinds of, 260; of fats and 

 oils, 266; of nitrogenous waste, 

 266 



Defense, of communities, 234; and 

 of organisms, 228; of young, 

 437 



Degeneration, 202 



Denitrifying bacteria, 273, 276 



Deposits of unicellular organisms, 

 27, 487 



Desert, 467 



Determinate evolution, 429 



Determination of sex, 313 (fig), 366 



Development of animals, 302, 416 



De Vrics, Hugo, 351 



Dexteritv, manual, 534 



Dial)etes, 175, 184 



Diatoms, 3, 44, 485 (fig.) 



Dietary accessories, 50 



DifFcrrntial genes, 381 



Differentiation, 305; of sex, 327 



Diffusion, 52, 84, 98 



Digestion, 91 



Dioxid, carbon, see carbon dioxid 



Diphtheria, 231 



Disease.H, of plants, 204; due to harm- 

 ful organisms, 216; due to malad- 

 justment, 179; and insects, 236 



Dispersed, means of animal, 473 



DisjKMMil of organic wast-ea, 259 



Dissolvctl substances, as stimuli, 

 135; movement of in plants, 56 



Distance, perception of, 146; re- 

 ceptors, 136, 142, 157 



Distribution, geographical, 9, 417; 

 laws and results, 475; of animals, 

 473; of life in the ocean, 482; of 

 plants, 449-471; of rainfall, 109 



Division, cell, 19, 283, 286 (fig.); 

 reducing, 310 (fig.), 342; of 

 lal>or, 30 



Do<ldcr, 108 (fig.) 



Dominance, 354 



Dormancy, of seeds, 341 



Drosophila, 365 (fig); determina- 

 tion of sex in, 366; heredity of, 

 36^-384; linkage in, 366 



Ductless glands, 171 



Duration of life, 249 



Dwarfishness, 173, 512 (fig.) 



Ear, 143 (fig.) 



Early development of animals, 302 



Early history, of germ cells, 310 

 (fig.) ; of the human race, 496 



Economic importance of disease, 

 204; of plant breeding, 390 



Education, 528, 537, 547 



Effectors, 150, 154, 



Effects of cultivation, 274; of 

 freezing, 250; of ocean currents, 

 483; of parasite on the host, 203 



Eggs, 163, 298 (fig.), 325, 329, 334; 

 maturation of, 313; parental 

 care of, 306; winter production 

 of, 401 



Embryo, 329, 339 



Embryolog>', evidence of evolu- 

 tion from, 416 



Emotions, 166, 186, 533, 539 



Emotional characteristics, 539 



Emulsion, 67 



Endosperm, 338; nucleus of, 339 

 (fiR.) 



Energv', 17, 37, 39, 73, 76; changes 

 in decomix>sition, 262; con- 

 servation of, 78; cycle, 279; 

 radiant, 39; release in metal)- 

 olism, 260; source of, 17 



Enrichment of life, 544 



Environment, 109; human, 519, 

 528; control of, 543; ideal, 542; 

 unsuitable, 204 



Enzyms, 66, 74, 77, 96, 260; classi- 

 fication of, 67; coagulating, 68; 

 decomposition, 261; fermenta- 

 tion, 68, 263; manufacture of, 

 93 



Epilepsy, 522 



Equilibrium sense, 137, 139 



Erect posture, 531 



Ethiopian realm, 479 



Eugenics, 526, 527, 554 



Euroi>ean racejt, later, 502 



Evidences of evolution, 408 



Evolution, 9, 407; determinate, 

 429; evidence of, 408; of camel, 



