INDEX 



835 



Resonance in photo-chemical reactions, 552 

 Respirations, external and internal, 600 

 - Mayow on, 604, 605 



nervous mechanism of, 632 



regulation of, 630 



Respiratory centre, reaction of, to hydrogen 

 ions, 630 



to oxygen, 631 



exchange of nerve centres, 472 



quotient defined, 279 



in hibernation, 278 



in muscular work, 449 



of isolated spinal cord, 608 



of kidney, 343 

 Rete mirabile, 361 



Retina, photo-chemistry of, 575 



structure of, 516 

 Retractor penis muscle, 403, 404 

 Reversal effects at periphery, 428 



- in reflexes, 427, 428, 499 



in cerebral cortex, 481 

 Reversible and irreversible colloids, 78 



inactivation of enzymes, 313 



reactions, 30 



and permeability of cell, 137 



catalysis of, 304 



final state foreseen, 4 



Reversibility of enzyme action, 321 



of processes, 30, 320 

 Rheonome, 382 



excitation of nerves by, 387 



tonic reflex by means of, 388, 409 

 Rheotome, 642 



Rhumbler's chloroform and glass rod ex- 

 periment, 3 



Rhythm of stimuli as factor in sensation, 514 

 Rhythmic contraction, 459 



reflexes, 498 



mode of production of, 498 



Righting movement of starfish, 482 

 Rigidity of minute drops, 96 

 Ringer, portrait of, 206 

 Ringer's solution, 207, 211 

 Rivers, dissolved matter in, 229 

 Rontgen rays, use of, in intestinal move- 

 ments, 368 

 Root pressure, 163 



tubercles of leguminoste, 252 

 Rumination, 373 



Sacral autonomic nerves, 484 

 Salicin, action of emulsin on, 305 

 Salicinase, 328 



Saline solutions, physiological, 205 

 Saliva, function of, 373 

 Salivary secretion, reflex, 503 

 ' ' Salting out " of colloids, 96 



Salts of muscle, 121 



of weak acids with weak bases, 218 

 Saponin haemolysis, action of salts on, 137 

 Sarcoplasm, contraction of, 545, 728 

 Saturation of haemoglobin with oxygen, 



614 



-- of surface in adsorption, 63 

 Schardinger's reaction, 586 

 Schema of the circulation, 672 

 Science as truth and beauty, xii 



object of, 424 

 Scratch reflex, 493 



number of neurones active in, 476 

 Scurvy, 259 



Sea anemone, digestion in, 366 



water in relation to salts of blood, 209 

 Searle's torsion apparatus, 49 



Seat of fatigue in muscle, 399 

 Secretin, 344, 350, 707 

 Secretion and osmosis, 163, 334 



and permeability, 140, 334 



by renal tubules, 355 



definition of, 333 



electrical change in, 658 



energy mechanism of, 342 



imbibition theory of, 335 



necessity of salts for, 215, 350 



nervous mechanism of, 345 



of urine in frog, 356 



of water, 333 



relation of, to oxygen pressure, 343 



work done in, 338 

 Secretions, osmotic pressure of, 334 

 Secretory activity and strength of stimulus, 



387 



" Secretory" nerves to glands, 345 

 Secretory pressure of saliva, 335 



process, nature of, 348 

 Semicircular canals, 528 

 Semipermeable membranes, 111 

 Sensation, analysis of, 513 



in physiology, 529 

 Sense of direction, 529 

 Sensitive plant, 138 



mechanism of movement in, 431 



Sensori-motor centres of cortex, 480 

 Sensory fibres in sympathetic nerves, 485 

 Sepia, secretion of ink of, 359 

 Sexual organs, internal secretion of, 713 



reproduction, advantage of, 292 

 Sherrington, portrait of, 489 

 Shock, 416 



Side-chain theory, 328, 729 



Silent discharge, production of formaldehyde 



by, 564 



Silica gel, water content of, 4 

 Silk, 361 



as charged colloid, 106 



peptone, use of, 288 

 Sinusoidal currents, 382 

 Siphon outflow recorder, 688 



