834 



INDEX 



Pseudo-acids, 188 



Pseudo-ions, 89 



Psj'chical secretion, 372, 503 



Psychology, 477 



Pulse wave, 684 



Purkinje system of heart, 656, 680 



tissue, rate of conduction in, 680 

 Purine metabolism, 271 



ring, source of, in proteins, 271 

 1'uriiifs, 271 



formed from proteins, 271 

 Putrefaction, 610 



Pyloric sphincter, 368 



Pyramidal tract, 477, 479 



Pyrimidine, 259, 270 



Pyrrol in chlorophyll and haemoglobin, 5<>U 



Pyruvic acid, 279 



from glucose, 275 

 aldehyde from glucose, 275 



Qualitative differences in nerve impulses, 



387 



Quanta, theory of, 28 



Quantum of energy as visual stimulus, 522 

 Quinine, photo-chemical oxidation of, 552 



Racemisation, 285 

 Radio-active phenomena, 575 

 Raehlmann's adsorption compounds, 65 

 Ramsden's surface condensation, 55, 56, 72 

 Ratchet mechanism of smooth muscle, 534 

 Rate of adsorption, 56, 61 



of conduction in nerve, 392 



of heart beat, temperature coefficient of, 



42 



of incidence of energy in stimuli, 400 



of ionic movement in nerve excitation, 



395 

 Rats, value of, for metabolism experiments, 



257 



Raulin's culture solution, 249 

 Raw serum, action of trypsin on, 317 

 Reaction nuclei, 555 



of artery to pressure, 687, 701 



of blood, 202 



time in plants, 431 

 Reactions in stages, 582 

 Rebound after inhibition, 491 

 Receptive substances, 344, 400 

 Receptor mechanism in general, 51 1 



neurones, 465 



organ, function of, 477 

 organs, 510 



Receptors, 465 



for sound, 525 



in plants, 529 



sensibility of, 513 

 Recessivr qualitx , 292 

 Recessivrs In-red tm,-. _".! 



Reciprocal action of reflex (t-ntics on each 

 other, 499 



innervation, 494 



in tonus fnnu labyrinth, 500 



in vasomotor reflexes, 094 



in " willed " movements, 497 

 Recovery of nerve impulses after decrement, 



384 



Red and brown seaweeds, f>'>7 

 Keducase, nature of, 588 

 Reducases in plants, 588 

 Reducing enzymes, 586 

 Reduction of carbon dioxide by bacteria, 



567 

 Reflex action, 475, 488 



arc, properties of, 488 



simplest form of, 466, 475 



from stellar ganglion, 475 



secretion, effect of want of oxygen on, 



409 



Reflexes to heart nerves, 684 

 Refraction in microscopic vision, !) 

 Refractive index, 230 

 Refractory period and permeability, 138 

 in heart muscle, 454 



phase in reflexes, 493 



seat of, 494 



state in nerve, 389 



in propagated disturbance, 390 



magnitude of impulse in, 389 

 Regulation of blood supply, 702 



of osmotic pressure of blood, 353 



of temperature, 456 



of respiration, 630 

 Reinforcement in reflexes, 490 

 Relative isomers, 287 



Relation between size of particles and 



precipitating salt, 94 

 Relaxation of muscle, 439 

 Relay mechanism in receptors, 512 

 Removal of cortical areas, 480, 506 



of lipoid from heart on perfusion, 211 

 Renal circulation and osmotic pressure of 



bloody 64 



secreti^f, Kowman's theory of, 354 



Ludwig's theory of, 354 



secretory process, general nature of, 357 

 Rennet, action of calcium on, 217 



Repair processes different from growth, 270 

 Replacement of lactic acid in muscle, 444 

 Reproduction, 291 

 Reproductive organs, internal secretions of, 



713 



Residual affinities, 229 

 Resonance, 88, 525, 551 



