10 



INDEX 



References are to pages 



215, 



Corn, continued 



summary of ... . 



wind-pollinated flower 

 Cornea of eye (fig.) 



Corolla, described 



Corpuscles, red and white . . 

 Cortex of root (fig.) . . 267, 

 Cortical layer of kidney . . . 



of root 



Cotton, member of mallow fam- 



iiy 



production, map of . . . . 



seed of (fig) 



source of clothing 



Cottony cushion scale . . . 



Cotyledon of corn 



Cotyledons, affected in bean 

 blight 



of bean 



importance of as food . . . 



size of 



storage of food in ... . 



parts of seed 



Cover crop, use of clover for . 

 Cow, example of mammal . . 



stomach of 



Cowbirds (fig.) 



nesting habits of 



Cowpox, Jenner and .... 

 Coxa, part of grasshopper's leg 



Coyote (fig.) 



Crab, soft-shelled (fig.) . . . 

 Crabs, classified 



common name for crayfish . . 



economic importance of . . . 



example of Crustacea . . . 



Cranium 



Crayfish (fig.) 



appendages of 86 



bearing eggs (fig.) 



circulatory system of ... . 



digestive system of .... 



example of Crustacea .... 



food and food-getting .... 



green glands of 



laboratory study of .... 



life history of 



limited environment of . . • . 



nervous system of 



organs of (fig.) 



321 

 305 

 216 

 296 

 197 

 268 

 207 

 267 



329 

 332 

 313 

 401 



27 

 263 



315 



260 



261 



261 



261 



301 



270 



7 



154 



147 



142 



251 



16 



150 



91 



6 



86 



90 



6 



118 



87 



,87 



86 



90 



89 



6 



89 



90 



88 



87 



162 



90 



89 



Crayfish, continued 



respiration of 90 



typical crustacean 86 



Creeping- disk of snails ... 98 

 Creeping- stem, of trailing ar- 

 butus (fig.) 288 



of Canada ginger (fig.) . . . 291 

 Crenate margins of mint 



leaves 331 



Cricket, member of Orthoptera 20 



hai'mful insect 22 



Crocodiles, distribution of . . 133 



example of reptiles 129 



Crop of earthworm .... 81 

 Cross-fertilization, changes 



produced by 311 



Cross-pollination, advantage 



of 



305 

 320 

 7 

 147 

 148 



effect upon wild plants . . 

 Crow, example of birds . . 

 Crows, as scavengers . 

 at bread crumb station . . 



at suet station 148 



at whole grain station . . . 149 



food of 22, 27, 31 



in nest (fig.) 146 



Crowfoot family, biting juice 



of 328 



characteristics of 327 



members cultivated for orna- 

 ment 327 



products of 327 



Crustacea, classified .... 86 



economic importance of . . . 90 



Crustacea and related forms 86 



Cryptogams, classified ... 7 



defined 6 



Cuckoos, food of .... 27, 31 



Cucumber, example of pepo . 310 



Cucumber tree (fig.) .... 379 

 Cud, stomach of animals that 



chew the 154 



Culex (mosquito) 42 



•eggs and larvae of (fig.) ... 42 



Culture, for protozoa .... 49 



from clean milk (fig.) . . . 252 



from dirty milk (fig.) . . . 252 



of bacteria 244 



Culture plates of agar-agar . 346 



Curdling of milk, cause of . . 348 



