368 



CIVIC BIOLOGY 



Dahlia, 86 



Dandelion, 72 



Dandruff, 236 



Darwin, Charles, 330, 331, 333, 338 



Datura stramonium, 72, 75 



Death-cup mushroom, 76 



Death-of-man, 75 



Deer, 169, 171, 172, 261, 263 



Deer farming, 172 



Deer flies, 113 



Delaware grape, 85 



Devilfishes, 274 



Devil's apple, 75 



Devil's-bite, 76 



Diamond-backed terrapin, 324 



Diarrhea, 232, 233, 234 



Diphtheria, 177, 232, 234, 235, 236, 

 239, 243, 245, 246, 248, 250, 251 



Diptera, 153, 155 



Discoverers, biological, 359-362 ; 

 present-day, 359 



Discovery, history of, 358, 359 ; im- 

 portance of, 357-358 ; kinds of, 

 356, 357 ; progress in, 355-362 



Distemper, 248 



Dock, 72 



Dodder, 188 



Dodo, 42, 43 



Dog, 165, 182. 257, 263 ; influenced 

 by alcohol, 341 ; itch mite of, 166 ; 

 as a transmitter of rabies, 256 



Dog tick, 168 



Dogwood, 75 



Dourine, 259 



Doves, 34, 42, 43 



Downy woodpecker, 6, 46 



Dragon flies, 129, 153 ; nymphs of, 

 as enemies to young mosquitoes, 

 131 



Drop, a disease of lettuce, 210 



Drug plants, 72 



Drug-store beetles, 155 



Dry rot, or stem blight. 216 



Duck, 38 ; attacked by rats, 174 

 Duck hawk, 45 

 Duck potato, or wapata, 307 

 Duckmeat (Lemna), 307 

 Duck-retter, 76 

 Dwarf larkspur, 76 

 Dysentery, 20, 107, 110, 233, 235, 

 245, 256 



Eagle, 44 

 Earthworm, 25 

 Eczema, 236 

 Effluvia, 237 

 Egg record, 104 

 Egret. 40 

 Elderberry, 86 

 Elk, 169, 171 

 Elm, 59, 82-84, 165 

 Elm-leaf beetle, 21, 156 

 Elodea, 307 

 Endocarditis, 232 

 English sparrow, 45, 49, 50, 182 

 Enteritis, 107, 232, 234, 235. See- 

 also Gastro-enteritis 

 Entomostraca, 287 

 Eohippus, 333 

 Erysipelas, 234. 251 

 Eugenics, 344 

 European root disease, 212 

 Evening primrose, 70 

 Evolution, 338 

 Excursions, plans for, 7, 8, 9 



Facultative bacteria, 221 

 Fall webworm, 155 

 Farm crops, relative fertility of, 101 

 Feeble-mindedness, causes and con- 

 sequences of, 344 

 Felons, 233 

 Fence swift. 325 

 Fermentation, 191, 194, 195, 196 

 Ferns. 188 

 Field mice. 34. 44 



