Epidermis, 168. Epiglottis, 135. Epithelial cells, 168, 169. Eruptions, 193. Esophagus, 7. _See also_ Gullet. Ether, 97. Ethers, 94. Eustachian tube, 257. Exercise, 241-251; appetite and, 208; heart and, 120-122, 126, 127, 128; muscles and, 204, 205, 208, 209. _Also_ 154, 162, 163, 176, 238. Extensors, 206. Eyes, care of, 266; development of, 167, 252, 253; structure of, 259-265. Eye-strain, 236. Fat, 51-55; fuel value of, 27, 51, 52; in digestion, 16, 17, 51; in liver, 198, 199; in milk, 30, 39. Fatigue, 241-243. Feces, 9, 18, 19, 192. Femur, 214. Fermentation, 94. Fever, 175-177; effect of, on heart, 125; in consumption, 124. Fibula, 213. Filters, domestic, 88; nature's, 74, 75, 83, 85, 86; of waterworks, 85, 86. Fish, fuel value of, 29; wastes from, 201. Fission of a bacillus, 288. Flexors, 206. Flies, 309-312. Food, absorption of, 17-19; appetizing, 9-10; as fuel, 4-7, 21, 25, 26; changed into blood, 18; cleanliness of, 22; "coal," 25, 26, 27-55; digestion of, 9-18; in blood, 110-113; irritating, 55, 59, 60; "kindling," 25, 26, 56-61; "paper," 25, 26, 31, 56-61; preservation of, 22, 23; sunlight in, 5-7; variety in, 23-25; water in, 73. Food tube. _See_ Alimentary canal. Foot, 230-232. Formaldehyde, 305-307. Formalin, 305-307. Fractures, 323, 324. Freckles, 190. Fruits, composition of, 24, 57, 58; fuel value of, 26, 58; in diet, 23-25; tainted, 22. Furs, as clothing, 182. Gall bladder, 199. Gall stones, 199. Games, 242-251. Ganglia, 217, 221, 223. Gardening, 61, 247, 248. Gas, illuminating, 143; sewer, 143. _See also_ Carbon dioxid, Carbonic acid. Gastric juice, 198. Gelatin, in veal, 29; for bacteria culture, 293, 309. German proverb, 269. Germany, smallpox in, 197; typhoid in, 80 _note_. Germicides. _See_ Disinfectants. Germs, 17 _note_, 301. _See also_ Bacilli, Bacteria, Cocci, Disinfection, Disease. Glands, development of, 10, 11 _note_; hair, 171, 172; lachrymal, 261; lymph, 17; of ear, 269; of intestine, 17-19; of stomach, 15,16; of throat, 256; oil, 171; parotid, 10; salivary, 10, 11; sublingual, 10 _note_; submaxillary, 10 _note_; sweat, 170, 171. Glucose, 41. Gluten, 28, 42, 48, 63. Glycogen, 198. "Goose-skin," 171. Gout, 32. Gray matter, 219, 221. Gristle. _See_ Cartilage. Gullet, 7, 9, 12, 13, 15, 134, 135. Habit, regularity of physical, 19.