436 



INDEX 



Drink habit, 214. 



Drowning, artificial respiration, 183. 



Drugs, use and abuse of, 143-144. 



Ducks, wild, 376. 



Ductless glands, 166, 167. 



Duff, 318. 



Dusting, proper method, 293-294, 



297, 337. 

 Dysentery, 266, 274. 

 Dyspepsia, 159, 160. 



Ears, 203, 204; 



of frog, 110; 



used for balancing, 196-197, 204. 

 Earthworms, grafting, 221. 

 Eating, habits of, 159, 160. 

 Echinodermata, classified, 241. 

 Echinoderms, as food, 348. 

 Ectoderm, 227. 

 Eczema, 272. 

 Edentata, 249. 

 Egg cell, development, 381, 382, 



383 

 Eggs, 223,224,225,226; 



fertihzed, 226, 227; 



fish, 372, 373, 374. 



formation of hen's egg, 231 ; 



value as food, 121, 123, 129. 

 Egret, 375. 

 Ehrhch, Paul, work on immunity, 



410. 

 Elasmobranch, Elasmobranchii, 245, 



246. 

 Element, defined, 8, 

 Elephantiasis, 289. 

 Elodea, 45, 46. 

 Embryo, chick, 231, 232; 



of mammal, 232 ; 



of plants, 51-58, 93, 226. 

 Embryo sac, of plant, 225. 

 Emulsion, 155. 

 Endocrine glands, 166, 167. 

 Endoderm, 227. 

 Endoskeleton, 243. 

 Endosperm, 58, 226. 

 Engine, compared with body, 112, 

 177, 208, 253 ; 



compared with living organism, 118 ; 



energy released in, 56. 

 English sparrow, 360. 



Environment, 7-8; 



influence on living things, 14-22 ; 



of man, 21-22, 292-311, 395; 



of plants and animals, 7, 14-22. 

 Enzymes, 60, 148; 



in intestine, 155, 157; 



in plants, 91, 92; 



of bacteria, 336 ; 



of yeast, 338. 

 Ephemerida, 242. 

 Epicotyl, 52. 

 Epidermis, human, 112; 



of a leaf, 76; 



of onion, 45. 

 Epiglottis, 150, 151. 

 Epithelial, layer, in blood vessels, 169 ; 



in viYli, 158. 

 Equilibrium, function of ear, 196-197, 



204. 

 Erepsin, 157. 

 Erosion, of soil, 314. 

 Esophagus, in man, 152. 

 Eugenics, 398. 

 Euglena, 193. 

 Eustachian tube, 150, 204. 

 Euthenics, 395. 

 Evaporation from leaves, 75, 76, 77, 



78. 

 Evergreens, 237. 

 Excretion, in man, 111, 187, 188, 189; 



in plants, 93. 

 Exercise, 174, 186. 

 Exoskeleton, 243; 



offish, 245; 



of insect, 25. 

 Experiment stations, 365, 390. 

 Eyes, 205, 206 ; 



care of, 213, 214, 310; 



of frog, 110: 



of insect, 26, 33. 



Fabre, entomologist, 209. 

 Factories, inspection, 298-299. 

 Fallowing, 342. 

 Family, in classification, 235. ' 

 Fatigue, 174, 186; 



of brain, 212; 



of nerve cells, 212. 

 Fats, 53, 119; 



absorption, 158; 



