Mumps, 290. Muscles, 202-209; and nerves, 220-227; controlling hair, 171; disorders of, 229, 230, 233, 234; exercise of, 241-248; in breathing, 138. _See also_ 7, 12, 13, 15, 214, 261, 262. Myopia, 262. Myosin, 28. Nails, 172-174. _See also_ 70, 188, 189. Narcotics, 90, 97, 237, 238. Nerves, and heart, 126-128; and muscles, 203, 220-227; auditory, 266; optic, 260; sciatic, 222, 223, 224; sensory and motor, 220; spinal, 220, 221. Nervous system, 216-227; alcohol and, 97-103, 239; development of, 167; disorders of, 235-240; effects of disease on, 238; eyes and, 264; fatigue and, 241-243; tobacco and, 105, 106. Nettle-rash. _See_ Hives. Neurons, 223. Nicotine, 105. Nitrogen, as food, 27, 46, 47, 132, 201, 133 _note_; in air, 132; in soil, 308. Nose, 167, 252-255, 274-276. Nuts, 32, 55. Oatmeal, 42, 47, 48. Ohio River, pollution of, 87 _note_. Oil, in killing larvae, 302, 303, 311. Oleomargarine, 53, 54. Onions, 58, 60. Opium, 97, 238. _See also_ Narcotics. Orbit, 260. Oxidation, 131-133. Oxygen, gas jets and, 143; in blood, 109, 110-113, 132; in water, 86. Ozone. _See_ Oxygen. Palate, 8. Panama, malaria in, 303. Pancreas, 11 _note_, 16. Pancreatic juice, 11 _note_, 12, 16, 17. Papillae, 258. Paralysis, 178, 239; infantile, 300. Parasites, animal, in the skin, 191-193. Parsnips, 59. Patella, 207. Patent medicines, 237, 238. Peaches, 58. Peanuts, 55. Pears, 58. Peas, 32. Pelvis, 214. Pemmican, 52. Pepsin, 14, 16. Peptic juice, 11 _note_, 14, 15. Periosteum, 215, 234. Peritoneum, 20. Peroxide of hydrogen, 318. Perspiration. _See_ Sweat. Pharynx, 8, 254, 256. Phenacetin, 237 _note_. Philippine Islands, smallpox in, 297. Physiology, 1-3. Pigment, 191. Pneumonia, 165, 166; coccus of, 154; effects of, on heart, 125. Poisoning, treatments for, 324-327. Poison ivy, 325, 326. Portal vein, 110, 198. Post mortem, 101. Potatoes, 26, 27, 40, 41, 42, 48, 56, 57. Privy vault, dangers from, 78, 79, 81, 192. Proteins, 27, 28; changed by liver, 198; in food, 28, 30, 31, 32, 47; wastes from, 199. Protozoa, 287, 288. Ptomaines, 22. Ptyalin, 11. Pulse, 112, 117, 118. Pupil, 265. Pylorus, 8. Quarantine, 291, 298. Quinine, 301. Radius, 213. Reading, position in, 228. Recti, 261. Rectum, 9, 18. Reflex, 221, 222. Reservoirs, 84-86; _also_, 79, 80, 85 _note_. Respiration, artificial, 329, 330. Retina, 260, 262, 263, 264. Rheumatism, 123, 125, 292, 295. Ribs, 138.