INDEX 



433 



Partial pressure of gases, 40. 



Perilymph, 209. 



Peripheral resistance in vascular system, 



281. 



Peristalsis, 317. 



Permeability as affected by calcium, 113. 

 Permeability, differential, 133 ; selective, 



111. 



Peroxidase, 96. 

 Phagocytes, 155. 

 Phases of action, of gland, 148 ; of 



muscle, 136, 145, 147. 

 Phases of growth, 368. 

 Phosphate buffer system, 334, 416. 

 Photosynthesis, 15, 355. 

 Phototaxis, see Heliotropism. 

 Physiological availability of energy, 9, 



27. 

 Pigment, 174 ; cells stimulated by light, 



174 ; of iris, colour of, 71. 

 Plasma, blood, coagulation of, 234 ; 



colloids of, 233 ; composition of, 233 ; 



crystalloids of, 238 ; C H of, 232 ; 



function of, 234, 241 ; osmotic pressure 



of, 233 ; oxygen carrying power of, 



248 ; refractive index of, 233 ; specific 



gravity of, 232 ; viscosity of, 232. 

 Plasmolysis, 107. 

 Poikilothermic organisms, 337. 

 Polarimeter, 104 ; model to explain, 102. 

 Polarisation, 116; at electrodes, 116; 



currents, 133, 188, 189 ; of membranes, 



116. 



Pole-finding paper, 116. 

 Positive polarisation current, 188. 

 Potassium, in Helmholtz double layer, 



152 ; radioactivity of, 122, 124 ; 



soaps, 82. 



Potential energy, 6, 8. 

 Potentiometer, 421. 

 Preparation of artificial amoeba, 403. 



404 ; chemical gardens, 399 ; colloidal 



solutions, 412, 413 ; dialysing vessels, 



405, 407; diffusiometer, 398 ; osmo- 



meter, 398. 



Prepyloric sphincter, 317. 

 Preservation of neutrality, 241, 252, 331, 



416. 



Pressure and growth, 374, 386. 

 Pressure of gas, 39. 

 Principle of Avogadro, 38 ; Carnot, 32 ; 



Gibbs, 48, 152, 175; least action, 9, 



11 ; Le Chatelier, 9, 128, 345, 360, 370. 

 Production of heat, 34, 347, 349. 

 Proprioceptors, 191. 

 Protective action of emulsoids, 80. 

 Protein, energy of, 19, 26 ; energy value 



of (physiological), 27. 



Proteins as colloids, 80 ; digestion of, 



317, 318 ; function of, in preserving 



neutrality, 332. 

 Proteins of blood, 233 ; function of, 239 ; 



osmotic pressure of, 233 ; viscosity 



of, 232. 

 Protoplasm, 2, 130 ; as an emulsion, 87, 



378 ; Brownian movement in, 183 ; 



colloidal nature of, 34, 130; liquid 



nature of, 34, 130 ; structure of, 130. 

 Proximate principles of food, 19, 26. 

 Pseudo-activation of enzymes, 97. 

 Pseudo-adsorption, 109. 

 Pulleys, 323. 

 Pulse wave, 280, 283. 

 Putrefaction and anaerobic action, 390. 

 Pyloric sphincter, 317. 



Quantum of energy as stimulus, 194. 

 Quinine, action on haemoglobin, 244. 



Radio-active phenomena, 117. 

 Radio-activity of potassium, 122 ; effect 



on heart, 124. 



Radium, effect on colloids, 81. 

 Rate of adsorption, demonstration on, 



411. 



Rate of conduction in nerve, 185. 

 Rate of growth, 365. 

 Rate of respiration, 265, 311. 

 Reaction, 58. 

 Receptors, 191. 

 Refraction, 103, 215, 219. 

 Refractive index, 53, 103, 216. 

 Refractory period of nerve, 186. 

 Regulation of rate of growth, 375 ; 



respiration, 312, 334 ; temperature, 



336. 



Reissner's membrane, 209. 

 Reserve air, 259. 

 Residual air, 259. 



Resonance, optical, 73 ; theory, 211. 

 Respiration, 258. 

 Respiratory centre, 312, 334 ; reaction 



to CH, 312, 334. 

 Respiratory quotient, 30. 

 Retina, 218, 358. 



Reversibility of enzyme action, 100, 390. 

 Reversible reactions, 99, 376, 381. 

 Rheoscopic frog, 145. 

 Rhythmic movement, model producing, 



404. 

 Rigidity of tissues, 87, 389 ; experiments 



to demonstrate, 399, 415. 

 Rivers, dissolved matter and colour of, 



71. 



Roentgen rays, 119. 

 Roux's experiment on growth, 385. 



