INDEX 



467 



Dominance and subordination in form 



control, 282, 283, 284, 285, 431 

 Dominant characters, 323 

 Drone, 385 



Drosophila melanogaster, 341 

 Duckbill, 120, 121 

 Ductless glands, 203 

 Duodenum, 159, 160 

 Dwarfism, 204 



Ear of vertebrates, 229, 230 

 Earthworm, 109, no, ijg, 140, 754, 



157, 138, 166, 17J, 184. 195, 796, 



213, 274, 374 

 Earthworm, nephridia, 184, 186 

 Echidna, 120 

 Echinodermata, 107, 108, 125, iji, 135, 



142, 143, 213, 214, 263, 296, 401 

 Echinoidea, 108, 109 

 Ecology, 53, 377, 431 

 Ectoderm, 707, 103, 130, 131, 132, 145, 



J47, 186, 210, 215, 240, 258, 270-271. 



See also Reproduction and Develop- 

 ment. 

 Ectoplasm, 55 

 Ectosarc, 55, 56 

 Edentata, 121 

 Effectors, 209, 240 

 Egg white, 15 

 Eggs, 75, 8g. 130, 794, 195, 251-276. 



See also Ovum, Gametes, Germ cells, 



Reproduction. 

 Eimer, 395 



Elasmobranchii, 777, 118 

 Electric fishes, 353 

 Electric organs, 353 

 Electrolytes, 11 

 Electrons, 7, 25 

 Elements, 6 



Elements in protoplasm, 13 

 Elephant, 123 



Embryo, 130, 271, 272, 273 

 Embryology, 53, 130, 424. See also 



Development. 

 Embryonic brain, 277, 279 

 Embryonic membranes, 279, 280 

 Embryonic vertebrate brain, 279, 220 

 Emulsification of fats, 163 



Enamel, 118, 144, 155, 756 



Endocrine glands, 203, 204, 244, 271 



Endocrines, 299 



Endocrinology, 52, 203 



Endoderm, 700, 103, 131, 133, 7J5, 



747, 258, 266, 270, 271. See also 



Reproduction and Development. 

 Endolymph, 231 

 Endolymphatic sac, 232 

 Endomixis, 71 

 Endoplasm, 55, 67 

 Endosarc, 55 

 Endoskeleton, 146-150 

 Endothelium, 183 

 Energy, 6, 17, 18, 23-29, 40-47, 58, 242, 



264, 289, 348, 366, 367, 426 

 Entamoeba, 97 

 Enteropneusta, 114, 775 

 Entomology, 357 

 Environment. See Adaptation. 

 Enzymes, 76-80, 154, 157, 162-165, 301 

 Eohippus, 406-408 

 Epidermis, 145, 746 

 Epigenesis, 345 

 Epsom Salts, 13 



Equilibrium, organs of, 22g, 2jo, 232 

 Erepsin, 163, 164 

 Erythrocytes, 774 

 Ethyl alcohol, 10, 61 

 Eugenics, 336-339 

 Euglena, g8, 225 

 Eustachian tube, 230, 231, 275 

 Eutheria, 120 



Evolution, 53, 387-420, 436 

 Excitation, 209 



Excretion, 52, 60, 184, 189, 190 

 Excretory systems, 184, 18$, 186, 187, 



188, 189 

 Exhalation, 172 

 Exocrine glands, 244 

 Exoskeleton, 142, 143, 144, 147 

 Exothermic reaction, 190 

 Experimental technique, 429 

 External ear, 230, 233 

 External fertilization, 193 

 Extinction, 398, 399 

 Extracellular digestion, 132 



