INDEX GLOSSARY. 



445 



Drosera, 49 

 Drupe, 154 

 Ducks, 650 

 Duck bill, 177, 652 



mole duck bill. 

 Dugong, 652, 667 



Eagles, 650 



Ear, 84 



Ear drum, 401-403 



Ear of insects, 397 



Ear of vertebrates, 398 



Ear sacs, 387 



Ear stone, 392 



Earthworm, chemical sense of, 368 



locomotion of, 411 



respiration in, 476 

 Earthworms, 305, 543 

 Earwigs, 582 



Ecdysis, molting, or shedding, the 

 superficial layers of the in- 

 tegument, 214, 731 

 Echidna, syn. for Tachyglossus, the 



spiny ant eater. 

 Echinodermata, 550 

 Echinoderm larva, 64 

 Echinoidea, 555 



Ecology. The science of the rela- 

 tion of organisms to each 

 other and to their inanimate 

 environment, 182-223 

 Ectoderm, 713 



of hydra, 339 

 Ectoplasm, 672 

 Edentata nomarthra, 652, 66 1 



xenarthra, 652, 661 

 Eels, 636 



Effectors, 439-441 

 Efts, 639 

 Egg, 671 



apparatus, the egg nucleus and 

 two other nuclei, synergids, 

 which lie together at one end 

 of the embryo sac, 299 



maturation of, 696 



membrane, 702 



of bird, 647 



pronucleus, 698, 699 



size of, 697 



yolk of, 711 

 Eimeria, 127 

 Elaters, 267, 287 

 Electrical organs, 874 

 Electric eel, 636, 874 



light bug, 591 

 Elephants, 666 



Elytra, 589 

 Embryo, 43, 44 



human, 249 



of dicotyledon, 189, 709 



of fern, 188, 709 



of hydra, 123 



sac megaspore, 293 

 Emeu, 650 



Enamel, of scales, 348 

 Endolymph, 398 

 Endoskeleton, the internal skeleton, 



420, 422- 

 Endospores, 228 

 Endosperm, 53 



gametophyte, 299 

 Endothelium a thin layer of cells 



lining a cavity, 379 

 Energy of animals, source of, 484 



relations of the animal, 446 

 Entamceba, 765 



coli, 510 



histolytica, 510 

 Enteropneusta, 618 

 Entoderm, 713 

 Entomophilous flowers which are 



pollinated by insects 

 Emydosauria, 644 

 Environment, 332 

 Ephemeroidea, 584 

 Ephyra, 528 



Epidermal hairs, of plants, 21 

 Epidermis, 20, 70, 101 



of leaf, 27, 80 



of mammal, 343 



of stem, 73 



of worm, 340 



origin of, 715 

 Epigynous, 134 



Epiphysis, the smaller bone formed 

 on the end of a long bone, 

 with which it ultimately 

 unites. 



Epiphytes, 213 

 Epithelium, a layer of cells covering 



an organ or lining a cavity. 

 Equilibration, 366 



in vertebrates, 392-395 

 Equisetinae, 287 

 Equisetum, 287 

 Eustachian tube, 403 

 Euthyneura, 600, 602 

 Evolution, 781- 

 Excretion, 329, 489- 



by liver, 493 



in amoeba, 489 



in hydra, 489 



Numbers refer to paragraphs; Black Face numbers refer to figures. 



