326 



INDEX 



Combustion, 49; and respiration, 



64. 



Commensalism, 280. 

 Conducting organs, 39. 

 Conjugation, cytoplasmic, 151 ; in 



animals, 155 ; nuclear, 152 ; 



partial, 151 ; in Paramecium, 



165 ; in Protozoa, 164. 

 Connective tissues, 41. 

 Conservation of energy, 50. 

 Cork, function of, 124. 

 Corn-root louse, 282. 

 Correlation, 209. 

 Creation, special, 299, 306. 

 Ctenodrilus, 132. 

 Ctenophor, 261. 



Curve, variation, 202 ; skew, 204. 

 Cycads, ciliated sperms, 313. 

 Cycle of the elements, 68. 

 Cytoplasm, 20. 



Darwin quoted, 307-308. 



Darwinism, 314 ; critique of, 318. 



Death, 4. 



Defects, Inheritance of, 239. 



Denitrification of the soil, 75. 



Determiner, 194. 



De Vries, Mutation theory, 208. 



Differentiation, in animals, 104 ; 



in plants, 121. 

 Digestion, 29 ; specialization in, 



42 ; in higher animals, 62. 

 Dioncea, 59. 



Disease, inheritance of, 236. 

 Dissimilation, 56. 

 Division of labor, 36. 

 Dodder, 292. 



Draba verna, species of, 305. 

 Drosera, 59. 

 Drosophila, 234. 



Ectoderm, 162. 

 Egg and sperm, 150. 

 Electric ray, 78. 

 Electric response, 247. 

 Electricity in organisms, 79. 

 Elements, cycle of, in Nature, 68. 

 Elephant, history of the, 310. 

 Endoderm, 162. 

 Endoskeleton, 110, 111. 



Energesis, 66. 



Energid, 25. 



Energy, conservation of, 50. 



Enterokinase, 85. 



Environment, 242, 245. 



Enzymes, 82. 



Epigenesis, 192. 



Eudorina, 147. 



Eugenics, 240. 



Evolution, of plants, 184 ; of sp< 



307. 

 Excretory organs, 117, 118; in 



Protozoa, 119. 

 Exoskeletou, 112. 



Fats, production of, in the 



organism, 55. 

 Ferments, 84. 

 Ferns, reproduction, 176. 

 Fertilizers, 71. 

 Filial regression, 219. 

 Firefly, 81-82. 

 Fission, in Mctazoa, 132; in lower 



plants, 135. 

 Flagellata, 33. 

 Flame cells, 119. 

 Flowers, 178. 

 Flying fish, 263. 

 Foods, 60; fate of, in animals, ill ; 



influence of, on response, 258. 

 Fortuitous variation, 202. 

 Fowl's combs, inheritance, 231. 



Galton, Francis 241 ; ancestral 

 inheritance, 217 ; device illus- 

 trating variation, 201. 



Galvanotropism, 251. 



Gamete, 141. 



Ganglia, 107, 108. 



Gastrulation, 161. 



"Genes," 324. 



Germ layers, 162. 



Germplasm, 150. 



Glands, 44 ; ductless, 86. 



Glycogen, 12. 



Grafting, 295. 



Growth, 90. 



Hemophilia, 239. 

 Hawthorn, species, 305. 



