Hair, 70, 171, 172 _and note_; care of, 172, 193, 194; diseases of, and scalp, 191, 193. Ham, 54, 55. Hammer, 267. "Ham-string" muscle, 208. Hang nail, 189. Headache, 235-237, 264. Heart, alcohol and, 99, 123, 124; beat, 9, 13, 117, 118, 119, 126-129; blood vessels connecting with, 111, 112; care of, 122; disease of, 123-128; exercise and, 120-122, 241, 243; function of, 108; nerves and, 126-128; repairing power of, 122, 123; structure and action of, 115-117, 118, 119; tea and coffee and, 128. Heart-burn, 13. Heat of body, normal, 175; radiation of, 175-177. Heating, 149, 151. Hemispheres, 216. Hives, 59. Hookworm, 191-193. Humerus, 213. Humus, risks to water from, 73, 74. Hydrophobia, 287, 318. Hygiene, 1-3. Hyperopia, 262, 264. Influenza. 239. _See also_ Colds. Insanity, 239, 240. Insect pests, 309-312. Instincts, 3, 21. Intestine, absorption in, 14, 16-19; digestion in, 9, 15-18, 20; effect of fibrous foods on, 47, 60; hookworm in, 192; muscles supporting, 204. Iris, 265. Jaundice, 199. Jenner, Dr., 296-298. "Joint oil." _See_ Synovial fluid. Joints, 213, 214; injury to, 323, 324. Kidneys, 196, 197, 199-201. _See also_ Wastes. Kipling quoted, 231. Klebs-Loeffler bacillus, 286, 293. Knee cap. _See_ Patella. Lactose, 30. Lard, 52, 54. Larynx, 272-276. Laveran, 301. Leavening, 43-45. Legumin, 32. Leprosy, 178. Lettuce, 26, 61. Lime, carbon dioxid and, 137; in body, 70, 210, 211; in water, 88. "Lime-juicers," 57 _note_. Liver, 197-199; development of, 11 _note_; function of, 110, 111; juice of, 16, 17; position of, 13; vein entering, 110; weight of, 16. _See also_ Wastes. Lungs, 133-136; capillaries in, 111; function of, 111; diseases of, 153, 157-166. _See also_ Wastes. Lymphatics, 17. Malaria, 199, 300-303. Maltose, 94. Marrow, 215; "spinal," 223 _note_. Mastication, 11, 12. Mastoid, 269. Measles, 193, 239, 290, 291. Meat, digestion of, 14, 17; fuel value of, 27-29, 58; tainted, 22, 32, 335. wastes from, 201. Medulla, 223, 226. Meningitis, cerebro-spinal, 295; tubercular, 157. Mesentery, 16. Microbes. _See_ Bacteria. Milk, bacteria in, 22, 33-39, 308, 309; digestion of, 14, 17; fuel value of, 28-31; inspection of, 34, 38, 39, 78; stations, 30, 92. Mosquitoes, 302, 303. Mouth, 7, 8, 9; in speaking and singing, 274-276; infection from, 285; breathing, 253, 256, 257, 283. Mucous membrane, 14, 110, 118, 255, 256, 275. Mucus, 255.