INDEX 



839 



Vasomotor effects on tongue, 403 



nerves, 688 



plexus in spleen, 402 



reflexes, 692 

 Vectorial forces in gels, 99 

 Vedensky's inhibition, 385, 420 

 Velocity of adsorption, 56, 61 



of ions, 177 



of reactions, 311 

 Velocities, law of, 157 

 Veratrine, action of, 417 



mode of action of, 728 



Vertebrate nervous system, morphology of, 



469 



Visceral nervous system, 484 

 Viscosity, 241 



of blood, 242, 687 



of colloidal solutions, 242 



of emulsoids, 97 



of two-phase systems, 243 



relation of, to chemical composition, 242 

 to temperature, 242 



Visibility and illumination (Rayleigh), 79 

 Visual purple, 520 

 Vital phenomena, 228 

 Vitalism, xi, 630 

 Vitamines, 258, 259, 260 

 Vividiffusion, 83 

 Vivisection, xii 

 Volume energy, 156 

 of the blood, 687 



Voluntary contraction, rate of impulses in, 

 440 



w 



Waals', van der, equation of state, 149 

 applied to liquids, 149 



applied to solutions, 150 



Want of oxygen, effects of, 634 

 Warming of heart, effects of, 653, 655 

 Water, a closely packed liquid, 234 



absorption of radiation by, 228 



as catalyst, 238 



as food-stuff, 247 



chemical formulae of, 235 



chemical inertness of, 229 



conductivity of, for heat, 227 



constitution of, 233 



content of silica gel, 4 



culture of plants, 248 



dielectric constant of, 232 



distribution of, between phases, 96 



electrolytic dissociation of, 237 



explanation of maximum density at 4, 



234 



heat capacity of, 226 



in regulation of temperature, 226 



importance of maximum density of, at 



4, 228 



Water in colloids, 77 



in reversible reactions, 239, 300, 323 



living cell alters concentration of, 239, 



323 



necessary for certain reactions, 233, 239, 



240 



power in relation to latent heat, 227 



properties and functions of, 226 



solvent powers of, 229 



supply to roots of plants, 228 



temperature coefficient of ionisation of, 



182 



Water-logged muscle, conduction in, 398 

 Wave lengths of visible spectrum, 79 

 Weak acids, salts of, with weak bases, 219 

 Wear and tear in muscular work, 269, 272 



not chemical disintegration, 256, 270 



Weber's law, 513 



Weight normal solutions, 149 



Whetham's conductivity method, 176 



migration apparatus, 91 

 Whiskers of cat, 514 



White rami of sympathetic, 484 



Whole of motor centre excited from any 



point, 491 



William of Occam's razor, 66 

 Willis' numeration of cranial nerves, 484 

 Winterstein's apparatus, 625 

 Work collector, 440 



done in compressing gas, 33 



in secretion, 338 



of chemical reaction, 30 . 



of heart, 673 



in relation to length of fibres, 675 



of muscle, 440 



Wren's intravenous injections, 342 



Xanthophyll, 559, 562 

 X-rays, 576 



Yeast as anaerobe, 610 



consumption of oxygen by, 609 



heat production of, 594 



mathematical law of growth of, 290 

 Yellow formed by red and green, 525 

 Young-Helmholtz theory of colour vision, 



522 



Zinc, effect of minute amounts of, 221, 257 



Zygote, 293 



Zymase, 309, 316 



Zymogen granules in cells, 335 



Zymogens, 327 



