520 



INDEX 



Dolphin, 129, 321 

 Dominant character, 290-295, 383 

 Donnan, 218 



Dorsal aorta, 171-173; See: Aorta 

 Dorsal nerve root, 201, 207, 208 

 Dragonfly, 94 

 Drone, 330 



Drosophila, 305, 306, 309, 311 

 Duckbill, 127 

 Duct, See: Gland 



Ductless gland, 160, 196; See: Hor- 

 mone 

 Dust, 220, 222, 418 

 Dysentery, 391, 407 



Ear, 105, 210, 212, 213, 357, 358 



Earth, 221, 222, 227, 359, 360 



Earthworm, 52, 81, 82, 100-103, 145, 

 161, 183, 189, 201, 209, 231, 235, 

 237, 344, 346, 416, 477; embry- 

 ology, 263-267; excretion, 183; 

 feeding instinct, 346; nerve cells, 

 201; regeneration and grafting, 

 237 



Earwig, 94 



Echidna, 127 



Echinococcus, 396, 399 



Echinoderm, 83-86; See: Sea urchin 



Ecology, 4, 335, 368, 415, 420; See: 

 Web of life 



Ectoderm, 8, 60, 99, 100, 134, 200, 

 214, 215, 231, 238, 272; See: Germ 

 layers 



Ectoplasm, 10, 19, 27, 35, 252 



Education, 5, 347, 388, 437, 444 



Eel, 115, 218 



Efferent nerve, 208; -See: Nerve 



Egg, 11, 57, 59, 191, 230, 231, 239, 

 247, 251, 252, 253, 340, 466-468; 

 bird, 253; frog, 190, 239, 268; hu- 

 man, 191, 239, 252, 273; mem- 

 brane, 252, 253; organization, 254, 

 275-280; rabbit, 273; sea urchin, 

 264, 279; shell, 252, 253 



Egypt, 218, 446 



Ejaculatory duct, 194 



Elasmobranch, 113, 114 



Elements, cycle of, 39-45 



Elephant, 129, 370, 371 



Elf, 118 



Elk, 419 



Embryo, 272, 365; human, 193, 273, 

 365 



Embryology, 4, 57-61, 231, 263-280, 

 364-366, 454, 466, 468 



Embryonic membrane, 128, 191-193, 

 271-273 



Emergent evolution, 384 



Emerson, 111 



Empedocles, 472 



Encyclopaedist, 460, 461 



Endamoeba, 48, 390, 396 



Endocrinology, 160, 172, 196-198, 

 319, 367 



Endoderm, 8, 60, 99, 100, 231, 238, 

 272, 337 



Endomixis, 55, 258, 259 



Endoplasm, 19, 27, 35, 252 



Endopodite, 106, 107 



Endoskeleton , 138, 145; *S'ee: Skeleton 



Energy, 14, 16, 24, 25, 27, 32, 33, 

 34, 37, 42, 159, 168, 197, 318; con- 

 servation of, 463; kinetic, 25, 32, 

 33, 36, 45; potential, 25, 32, 33, 

 36, 45, 498 



Enteric cavity, 8, 60, 61, 71, 73, 99, 

 100, 264, 266, 268, 480 



Enteric pouch, 264 



Enteron, 76, 99, 264, 269; See: Enteric 

 cavity 



Enterozoa, 480 



Entomology, 350, 392, 416; See: In- 

 sects 



Entomostraca, 90 



Environment, 27, 285, 286, 301, 312- 

 316, 372, 383, 473, See: Adapta- 

 tion 



Enzyme, 23, 33, 41, 61, 151-159, 226, 

 318 



Eoanthropus, 433, 434 



Eocene epoch, 359-362, 430 



Eohippus, 362-364 



Eolith, 438 



Ephyra, 75 



Epidemic diseases, 391 



Epidermis, 8, 103, 134, 135, 274, 280 



Epigenesis, 274-280, 467 



Epiglottis, 148, 162, 421 



Epipharynx, 330 



Epipodite, 106 



Epithelium, 11, 28, 61-G4, 70, 134, 

 151, 201, 208, 211, 216 



Equatorial plate, 241 



Equilibration, sense of, 210, 212 



Equilibrium of nature, 335; See: Web 

 of life 



