INDEX 



Deductive method, 6 



Dehydration, 518 



Deletion, 608 



Deltoid, 304, 386 



de Maillet, 650 



Dendrites, 74, 75, 411 



Dentalium, 262 



Dentine, 454 



Dermal branchiae, 272 



Dermis, 302, 367, 368, 372 



Desert, 101, 102 



Development of an indi\ idual, 560-580 



Devilfish, 267, 268, 397 



Devonian (period), 625 



coral reef, 629 

 De Vries, 582 

 Dextrose. See Glucose 

 Diabetes insipidus, 437, 449, 450, 528 



melhtus, 436-437, 613 

 Diapause, 228 

 Diaphragm, 325, 479, 480 



iris, 398, 399 

 Diastole, 497, 498 

 Didinium, 133, 134 

 Diencephalon, 307, 310, 420 

 Difflugia, 127, 128, 374, 375 

 Diffusion, 52, 53 



Digestion, in the mouth, 455, 456 

 in the stomach, 458, 459, 460 

 in the intestine, 464, 465 

 Digestive gland, 211, 212, 213 

 Digestive systems, crayfish, 211, 212 

 earthworm, 191, 192 

 frog, 310-312 

 grasshopper, 225 

 hydra, 141, 142 

 lobster, 211, 212 

 man, 451-474 

 planaria, 162, 163 

 Digits, 305, 306 

 Dihybrid, 592, 593 

 Dinoflagellates, 123 

 Dinosaur, 321, 322 



tracts, 322 

 Dioecious, 139, 169 

 DiphyUobothrium latum, 173 

 Diplodocus, 323 



Diploid number of chromosomes, 555 

 Diptera, 221 

 Disaccharide, 41 

 Discorbis, 128, 129 

 Distribution of animals, 642-646 

 Division of labor among cells, 67, 68 

 Dolichoglossus kotcalevskyi. See Acorn worm 

 Domestic fowl, 333 

 Domestication, 663 

 Dominant trait, 583 

 Dopa oxidase, 587 

 Dorsal aorta, 314, 316 

 Dragon flies, 99, 237, 238 

 Drone, 228, 229 

 Dwsophila, 585, 654 

 Diyopethicus, 354 

 Duck, young, 332 



707 



Duckbill, 337, 338, 339 



Duct, bile, 311, 312, 453, 462, 463 



genital, 312 



pancreatic, 311, 312, 462, 463 



sperm, 165, 228 



urinary, 312, 521 

 Ductus arteriosus, 544 

 Dugesia, 164 

 Duodenum, 435, 461 

 Duplication, 608 

 Dutrochet, 57 

 Dyad, 556, 557, 558 

 Dytiscus, 239 



Eagle, 332 



Ear, inner, 403, 405 



middle, 403, 405 



outer, 403 

 Ear bones, 281 

 Eardrum, 300, 302, 308 

 Earth, 21 



Earthworm, 78, 189-198, 383, 384, 392, 393, 451 

 452, 491, 522 



Echidna, 337 



Echinodermata, 252, 268-277 



Ecology, 16, 87 



Ectoderm, 68, 142, 562, 564 



Ectoplasm, 110 



Efi^ectors, 429-433 



Egg, 83, 301, 320 



Electric eel, 433 



Electric organs, 433 



Electrocardiograph, 503 



Electrolyte, 29 



Electrons, 26 

 Elephantiasis, 182, 183 



Elytra, 239 



Embryo, human, 543 

 Embryology, 16, 560-580, 632 



experimental, 570-575 

 Empedocles, 649 

 Emu, 355 

 Emulsions, 47 

 Enamel, 454 

 Encasement theory, 561 

 Encephalon, 420 

 Enchytraeus, 198 



Endamoeba histolytica, 90, 129, 130 

 Endocrine glands, 433-450 

 Endoderm, 562, 564 

 Endoplasm, 110 

 Endopod, 210 

 Endothelium, 494, 495 

 Enterokinase, 464 

 Enteron, 78, 79, 141 

 Environment, 87 



and heredity, 609-612 

 Enzymes, 43, 225 

 Eocene (epoch), 625 

 Eohippus, 656, 657 

 Eosinophil, 494 

 Ephedrin, 444 

 Ephemeroptera, 221 



