8 3 8 



INDEX 



Titration of acid, 187 



Tolerance of electrolyte by colloid, 95 



Tone in relation to labyrinth, 543 



in tortoise auricle, 540 



of smooth muscle, 377 



Tongue of dog, vasomotor, effects in, 403 

 Tonic reflex by rheonome current, 388 

 Tonicity of solutions, 166 

 Tonus, 533 



in adductor of molluscs, 406 



in nerve centres, 546 



in skeletal muscle, 540 



in vaso constrictor centre, 412 



of blood vessels, 533 



of diaphragm, 418 



of smooth muscle, 436, 533 

 not nervous, 534 



Tortoise auricle, tonic changes in, 540 

 Touch, 504, 511, 514 



varieties of, 514 

 Toxins, 728 

 Tracing point, 460 



Transfer of energy and activity, 31- 

 Transitions between adsorption and com- 

 bination, 618, 619 

 Transmission of acquired characters, 718 



of excitation in muscle, 455 

 Transplantation of organs, 288 



of ovary, 714 

 Traube, portrait of, 112 

 Trigger action, 304 

 Trimolecular reactions, rarity of, 582 

 Triple point, 617 



Trivalent ions, action of, on colloids, 92, 



105 



Trophic nerves, 288 

 "Trophic nerves" to glands, 345, 346, 348', 



388 



Trypsin, optimal reaction for, 374 

 Tryptic digestion, increase of conductivity 



in, 219 

 Tryptophane, importance as food-stuff, 256, 



257 

 Tubule cells in relation to water of urine, 



355 



Tumours, growth of, in relation to food, 258 

 Turgor, 117, 162 

 Tympanic membrane, 526 

 Tyndall phenomenon, 74 

 Tyrode's Ringer solution, 21 1 

 Tyrosinase, nature of, 589 

 Tyrosine as accessory factor, 261 



u 



Ultra-filtration, 84 

 Ultra-microscope, 79 

 protoplasm under, 6 

 Ultra-violet light, absorption of, 569 

 action of, 514, 569 



Ultra-violet light, action of, on bacteria and 



tissues, 570 

 action of, on eye media, 571 



filters for, 569 



mechanism of action of, 570 

 photographs by, 10 



reducing action of, 570 



Unconditioned reflexes, 502 

 Unequal distribution of salts through mem- 

 brane, 120, 160 

 Unimolecular reaction, 311 

 Union of heterogeneous nerves, 387 

 Univariant system, 617 

 Urea as nitrogen food in animals, 281 



formed in liver, 265 

 in tissues, 265 



Ureter, electrical change in, 652 

 Uric acid, 271 



in metabolism of muscle, 272, 289 



secreted by tubules, 355 



Urine, constituents of, 229 



of birds, 355 



of fish, 354 



work done in secretion of, 339 

 Uterus of guinea-pig, 163 

 Utilisation of fuel, 378 



Vagus inhibition, relation of, to potassium, 

 217 



nerve, action of, on colon, 370 

 on heart, 682 



on intestine, 368 



on pancreas, 346, 408 



on tortoise heart, 405 



different modes of action of, 683 



effect of, on duration of excitatory 



state, 407 



on excitability, 407 



on rate of transmission, 407 



electrical change in, 386 



function of, in respiration, 633 



history of discovery of inhibition by, 681 



inhibition of pancreas by, 349 

 Valency, change of, in oxidation, 581 

 Value of abstract work, viii 

 Valves of the heart, 673 



Vapour pressure and osmotic pressure, 154 



determination of, 155 

 Variables, 36 



Vaso-constrictor nerves, discovery of, 688 



morphology of, 690 

 Vaso-dilation by metabolites, 340, 699 

 Vaso-dilator mechanism of skin, 473 



nerves, discovery of, 689 

 existence of, 700 



morphology of, 690 



Vaso-dilators of sympathetic nerve, 700, 727 

 Vasomotor centres, 694 



