Oxygen, 104-117. Combined, 105, 113. Free, 105, 113. How it unites, 105. Main uses of, 108. Movement a necessity, 106, 108, 115. Movement in body, 106, 108, 115. Nature of, 104. Passage of, from cells, 110. Passage of, through blood, 109. Passage of, toward cells, 109. Preparation of, 113. Pressure, 109. Properties of, 113. Purpose of, in the body, 106. Oxyhemoglobin, 27. Pacinian corpuscles, 342, 343. To demonstrate, 348. Pancreas, 155. Pancreatic juice, 155. Papillæ, 266. Patent medicines, 166. Pelvic girdle, 226. Pepsin, 149. Peptones, 149, 176. Pericardium, 41. Perilymph, 361. Perimysium, 245. Periosteum, 218. Peritoneum, 180. Perspiration, 207. Pharynx, 145. Openings into, 145, 146. Phosphorus, 135. Phrenic nerve, 302. Physiological salt solution, 38. Physiology, defined, 2. Pia, 299. Pigment granules, 266. Pinna, 358. Pitch, detection of, 365. Pivot joint, 232. Plasma, 25, 29. Pleura, 84. Plexus, 281. Pneumonia, 94. Pons, 290. Pons Varolii, 290. Portal vein, 154. Primitive sheath, 284. Proteids, 161. Circulating, 179. Kinds of, 118. Purposes of, 119. Supplied by, 125. Tests for, 135, 136. Tissue, 179. Proteoses, 149, 176. Protoplasm, 14. Protozoa, 394. Ptyalin, 145. Public sanitation, 396. Pulp cavity, 143. Pupil, 375. Pure food law, 128. Pus, 28, 29. Pyloric orifice, 147. Pyramids, 202. Quarantine, 406. Radius, 227. Reaction time, to determine, 323. Reading glasses, 386. Receptacle of the chyle, 68, 170. Rectum, 158. Red corpuscles, 25. Disappearance of, 27. Function of, 26. Origin of, 27. To examine, 38. To prepare models of, 39. Red marrow, 219. Reënforcement of sound, 352, 356, 368. Reflection, kinds of, 371. Reflex action, 308. Diagram illustrating, 310. In circulation of blood, 311. In digestion, 310. Purposes of, 311. Reflex action and mind, 308. Reflex action pathway, 309. Refraction, 371. Rennin, 149. Respiration, 76-103. Artificial, 97. Internal, 89. Lung, 76. Retina, 376. Retinitis, 333. Rheumatism, Effects on the heart, 56. Sequel to other diseases, 407. Right lymphatic duct, 67. Rods and cones, 377. Rods of Corti, 364. Sacrum, 224. Saliva, 145. Composition of, 145. Uses of, 145. To show action on starch, 171. Salivary glands, 144. Kinds of, 144. Reflex action of, 323. Sanitation, defined, 2. Sarcolemma, 244. Sarcoplasm, 244. Scala media, 363. Scala tympani, 363. Scala vestibula, 363. Scarlet fever, care after, 211. Sciatic nerve, 302. Sclerotic coat, 374. Secondary reflex action, 314. Secretions, 197. Kinds of, 200. Secretory process, nature of, 199. Seeing, problem of, 372. Self-control, 326, 334. Habit of, 325. Semicircular canals, 362. Semilunar valves, 44. Sensations, 338-349. Classes of, 339. Production of, 338, 349. Purposes of, 340. Special, 340. Sensations (_continued_). Steps in production of, 341. Sensation stimuli, 339.