INDEX 



695 



show use of, 363; experiments to 

 show stomach, 372 ; hygiene of, 380 ; 

 in crayfish, 234-235; in frog, 250- 

 251; in mouth, 364-365; in plants, 

 171-172 ; in small intestine, 373-374 ; 

 in stomach, 369-372 ; meaning of, 

 129 ; purpose of, 130 ; salivary, 364- 

 365 ; table of chemical, 381 



Digestive organs, of fish, 246 ; of frog, 

 368; of man, 368, 369-380 



Digestive system, offish, 246 ; laboratory 

 study of frog's, 367-368 ; laboratory 

 study of man's, 367-368 



Digestive tract, description of man's, 

 369 ; laboratory study of frog's, 367- 

 368 ; laboratory study of man's, 

 367-368 ; parts of, 368-369 



Dihybrid, 623 ; breeding of, 623 



Dinosaur, 273 ; eggs of, 266-267 



Diphtheria, antitoxin treatment for, 

 477-478 ; cause of, 466 ; prevention of, 

 478 ; Schick test of susceptibility to, 

 478-479 ; transmission of, 472 



Diptera, 59 ; classified, 238 ; discussed, 

 75-76 



Disease, some conquerors of, 659-665 



Disease carriers, Aedes mosquito, 487- 

 488 ; Anopheles mosquito, 483-484 ; 

 bedbug, 491 ; body louse, 491 ; flea, 

 491 ; house fly, 489-491 ; people, 469 



Diseases, carried by insects, 483-484, 

 487-488, 489-491 ; caused by proto- 

 zoans, 482-486 ; caused by worms, 

 492-496 ; how caused by bacteria, 

 461-463; how get, 463-470; of nose 

 and throat, 407-408 ; spread by rats. 

 491-492. See also Bacterial diseases. 



Disinfectant, laboratory problem to show 

 most effective, 460 



Disinfection, need of, 461 ; terminal, 

 509 



Division, cell, cause of, 611-613 ; process 

 of, 48, 49 



Dodder, 105 



Domesticated animals, economic value 

 of, 537 



Dominance, Mendel's law of, 621 



Dominant characters, 621, 630-631 



Dragon flies, 78-79 ; classification, 238 



Drug-producing plants, 529-530 



Drugs, in medicine, 355 



Duct, thoracic, 399 



Ductless glands, 361, 392-395; adrenal, 

 393 ; location of, 392 ; pancreas, 392 ; 

 parathyroid, 392 ; pituitary, 393-394 ; 

 reproductive, 392, 394-395 ; secretions 

 of, 392 ; thymus, 394 ; thyroid, 393 



Dwarfs, probable cause of, 393 



Ear, diagram of, 439; in fish, 245; in 

 frog, 250; inner, 439; middle, 438- 

 439 ; organ of hearing, 438 ; outer, 

 438 



Earthworm, grafting, 614; laboratory 

 exercise on, 229 ; life process of, 230- 

 231 ; locomotion of, 229-230 ; repro- 

 duction of, 231 ; segments of, 229 ; 

 setae of, 229 



Echinodermata, characteristics, 226-228 ; 

 classification, 227 



Echinoderms, characteristics, 226 ; clas- 

 sification, 227 ; examples, 226-228 



Ecological realms, 308-309 



Ecological succession, 300-305 



Ecology, 282 



Economic importance, of birds, 547-551 ; 

 of insects, 560-569 



Economic values, of animals, 530-544; 

 of plants, 520-530 



Ectoderm, development of, 618 ; systems 

 formed from, 617, 618 



Edwards, Jonathan, family of, 638-639 



Egg, development of fertilized, 617- 

 618 ; in Vaucheria, 615 



Egg cell, 617 



Elements, found in living things, 29 ; 

 found in the environment, 29 ; mean- 

 ing of, 19 



Elodea, cells of, 46 ; protoplasm of, 47 



Embryo, 86; development of bird, 618; 

 factor necessary to awaken, 120, 121 ; 

 in plant, 616 ; protection in birds, 

 618-619 ; protection in mammals, 619- 

 620; of bean, 117; what becomes of 

 parts during growth, 122-123 



Embryo sac, in flower, 85 



Emulsion, 374 



Endocrine glands, 361 ; adrenal, 393 ; 

 location of, 392; pancreas, 392, 394; 

 pituitary, 393-394 ; reproductive, 392, 

 394-395 ; seoretions of, 392 ; thymus, 

 394; thyroid, 392, 393 



Endoderm, development of, 618 ; sys- 

 tems formed from, 617, 618 



Endosperm, how formed, 616; of corn, 

 125 ; of other seeds, 125-126 



Energy, conservation of, 27 ; forms of, 

 26; kinetic, 313; potential, 313; 

 sun, source of, 157 



Energy requirement, how to compute, 

 342-343 



Environment, affecting animals, 610- 

 611; affecting plants, 608-610; cause 

 of changes, 300-305 ; factors affecting 

 ecological relationship, 290-297 ; how 

 man controls natural, 32-54 ; improve- 

 ment of natural, 33-34 ; man control 

 for health, 455-511; man control for 

 wealth, 518-569 ; relation to diet, 335, 

 338 ; versus heredity, 606-607 



Enzymes, 129, 137; diastase, 130; in 

 plants, 162, 1.71 ; work of, 361, 362 



Ephemerida, order of insects, 238 



Epidermis, human body, 316 ; of leaf, 

 152, 153 ; of root hairs, 144 ; of stem, 

 166 



