694 



INDEX 



Coccus, kind of bacteria, 183 



Cochineal, insect origin, 561 



Cochlea, function of, 439 



Codling moth, 565 



Coelenterata, characteristics, 224 ; clas- 

 sification, 226 ; examples of, 224-225 



Colds, cause of, 415-416 



Cold storage, and bacteria, 458 



Coleoptera, 60-61, 238 



Color in leaves, cause of change in, 159 



Commercial life, abilities needed for, 

 647-648 



Communal life, of insects, 69-75 



Communicable diseases, 508-510 



Communities, plant and animal, 298-300 



Community, improvement of conditions 

 in, 503-507 ; inspection of food sup- 

 plies, 504, 505 



Composite family, 212-213 



Composite flower, pollination of, 92 



Compounds, meaning of chemical, 19-21 



Conditions, improve community, 503— 

 507 ; improve home, 597-600 ; improve 

 school, 501-503 



Conifers, 206 



Conjugation, in Spirogyra, 201-202, 615 ; 

 of Paramecium, 221-222 



Conqueror, how man has become world, 

 420-451 ; of disease, 659-665 



Conservation, applied to man, 599- 

 601 ; of birds, 594-597 ; of fish and 

 other aquatic animals, 587-593 ; of 

 forests, 581-587 ; of mammals, 598- 

 599 ; of natural resources, 2, 572-601 ; 

 of trees, 574-581 



Constipation, 379-380 



Contractile vacuole, of amoeba, 219 ; 

 of Paramecium, 220 



Coral, economic value of, 542 



Corn, cross section of grain of, 125 ; 

 cross section of stalk of, 169 ; en- 

 dosperm of, 125 ; use of food supply 

 during germination, 128 ; uses of, 

 524-525 



Corn worm, harm done by, 562 



Corolla, of flower, 83, 84 



Corpuscles, red, 387 ; white, 387-388 



Cortex, of stem, 166 



Cotton, uses of, 528-529 



Cotton-boll weevil, 562-564 ; control of, 

 567 ; life history, 563 ; spread of, 563 



Cotyledons, bean, 117; food in, 117-118 



Cowbird, 559, 560 



Crab, fiddler, 236 ; rock, 236 ; used for 

 food, 534 



Crayfish, antennae, 233 ; appendages, 

 233 ; circulatory system of, 235 ; 

 description of, 233 ; digestion of, 234- 

 235; eyes, 233-234; excretion of, 

 235; food-getting, 234; gills, 235; 

 life history of, 235-236 ; locomotion 

 of, 233 ; nervous system of, 235 ; 

 skeleton of, 233 



Cretinism, cause of, 393 



Crocodiles, 259 



Crops, damaged by insects, 562-565; 

 rotation of, 188-189 



Cross-pollination, 88 ; artificial, 634-635 ; 

 devices to secure, 92-94 ; specific ex- 

 amples of, 91—96 



Crow, 548, 558-559 



Crustaceans, as food, 533-534 ; compared 

 with insects, 237 ; crab, 534 ; lobster, 

 533; shrimp, 534 



Culture medium, for bacteria, 181-182 



Cure-alls, medicine, 356-357 



Cuts, treatment of, 401 



Cycads, 205-206 



Cycle, carbon, 286 ; nitrogen, 285 ; 

 oxygen, 285-286 



Cypress knees, 150 



Dakin solution, 664-665 



Damsel fly, 79 ; order of, 238 



Darwin, Charles, family tree of, 639; 



on natural selection, 605 ; on polli- 

 nation of flowers, 56 ; on progressive 



development, 665-667; on variation, 



605 

 Decay, caused by bacteria, 186-187 

 Dehiscent fruits, scattering seeds by, 



109-110 

 Dendrites, of neuron, 431 

 Development, of birds, 618-619 ; of 



mammals, 619-620 ; progressive, 665- 



667 

 de Vries, Hugo, mutants, 633 ; on plant 



breeding, 671 

 Diabetes, cause of, 395 

 Diastase, action on starch, 130 

 Dick test, 479 ; for scarlet fever, 665 

 Dicotyledonous stem, circulation of food 



in, 170-171; cross section of, 167; 



growth of, 167-168 ; structure of, 166- 



167 

 Dicotyledons, 126, 127; buttercup 



family, 210-211; carrot family, 212; 



composite family, 212-213 ; heath 



family, 212 ; legume family, 209-210 ; 



mint family, 211 ; mustard family, 



211 ; rose family, 210 ; willow family, 



211-212 

 Diet, best proposition of nutrients in, 



340-343 ; relation of appetite to, 339 ; 



relation of cost of food to, 345-346 ; 



relation of digestibility to, 338-339; 



relation of environment to, 335- 



338 ; relation of sex to, 338 ; relation 



of size and age to, 338 ; relation of 



work to, 335 

 Diffusion, 147 ; demonstration showing, 



147 ; physiological importance of, 149- 



150 

 Digestibility, of food, relation to diet, 



338-339 

 Digestion, 129-130; demonstration to 



