INDEX 



833 



Pituitary, effect of, on kidney, 359 

 Plant receptors, 529 

 Plasmolysis, 118, 169 



and autofermentation, 163 

 Plastic tonus, 540 

 Plateau's experiments, 49 



Platinum metals as reducing catalysts, 587 

 Plato on mathematics, 37 

 Plethysmographic methods, 688 

 Poikilothermic organisms, 455 

 Poison of cephalopod, 360 



of mason wasp, 360 

 Poisons, secretion of, 360 

 Polar excitation, 381, 417 

 Polarimeter, 283 



Polarisability diminished in excitation, 393, 



398 

 Polarisation, 176 



at'electrodes, 390 

 Polarised membrane, 648 

 Polymers in water, 233 

 Polymerisation a chemical change, 233 

 Polypeptides, 103 



Portrait of Arrhenius, 172 



of Burdon-Sanderson, 661 



of Descartes, 38 



of Ehrlich, 11 



of Faraday, 171 



of Emil Fischer, 261 



of Rene' de Graaf, 371 



of Graham, 76 



of Stephen Hales, 671 



of Harvey, 665 



of Helmholtz, 519 



of van't Hoff, 33, 34, 321 



of Leeuwenhoek, 666 



of Ludwig, 684 



of Mayow, 601 



of Napier, 39 



of Ostwald, 321 



of Pavlov, 370 



of Pfeffer, 147 



of Priestley, 602 



of Ringer, 206 



of Sherrington, 489 



of Traube, 112 

 Porphyrins, 560 

 Position receptors, 527 

 Positive variation in nerve, 392 

 Posture reflexes from labyrinth, 500 

 Potassium, action of, on heart muscle, 207, 



209 



acts on cell membrane, 142 



in Helmholtz double layer, 217 



in relation to vagus inhibition, 217 

 Potential at membranes, 161 



energy of muscle, 441 



raised in vital processes, 564 

 Poverty and protein minimum, 268 

 Precautions in use of indicators, 188, 190 

 Precipitates, aggregation of, 108 



53 



Preparation of colloidal solutions, 108 

 Presentation time in plants, 431 

 Preservation of neutrality, 195 

 Pressor reflexes, 697 

 Pressure in imbibition, 100 

 - in plant cells, 117, 118, 120 

 Priestley, portrait of, 602 

 Priestley's discovery of oxygen, 606 



frontispiece, 603 



Principle of Carnot and Clausius, 27 



of Gibbs, 55, 72 



of Le Chatelier, 618 



of mobile equilibrium, 44, 618 

 Production of enzymes, 327 



of heat, 456 



effect of food on, 456 



of oxygen by plant in spectrum, 562 



of starch by leaf in spectrum, 562 

 Progress, law of (Gaskell), 464 

 Proprio-ceptors in general, 51 1 



of muscle, 500 

 Proprio-spinal neurone, 476 

 Prosecretin, 708 



Protection by stable colloids, 97 



of enzymes by adsorption, 313 

 Protective enzymes, 327 



Protein, consumption of, by heart, 677 



in cell membrane, 134, 135 



ions, properties of, 104 



membranes, permeability of, 135 



specific dynamic action of, 247 

 Proteins as antigens, 316 



as colloids, 102 



ash of, 67 



chemical nature of, 103, 262 



digestion of, 374 



electrolytic dissociation of, 103, 104 



function of, in preserving neutrality, 202 



metabolism of, 261 



nomenclature of, 263, 264 



of blood, not food, 107, 288 



relation of, to neutral salts, 105, 221 

 Protopathic sensibility, 514 

 Protoplasm, absorption of ultra-violet by, 



570 



apparently structureless, 2 



becomes gel on stimulation or death, 6, 



22 



Brownian movement in, 6, 19 



changes effective concentration of water, 



239 



chemical nature of, 17 



colloidal nature of, 6, 



electrical stimulation of, 6, 22 



filtration of, through cotton wool, 6 



general properties of, 1 



liquid nature of, 5, 6, 111 



reactions of, to environment, 21 



structure of, after fixation, 15 



temporary organs formed by, 2, 3 

 Protozoa, food requirements of, 249 



