INDEX 



237 



Three constituents of diet, 65 



Thyroid, 136 



Titration, 28 



Tonic contraction, 97 



Touch, 104, 1 06 



Toxins, 57 



Trachea; of insect, 85, 200 



Tradescantia hair, 166 



Transmission of heart beat, 150 



Transport of materials, 132 



Trigger-action, 97, 105 



Trophic influence, 122 



Trypsin, 75, 193 



Tryptophane, 46 



Tubules of kidney, 138 



Turgor, 22, 171 



Tyndall phenomenon, 176 



ULTRA-MICROSCOPE, 4, 32 

 Unconditioned reflexes, 127 

 Unsaturated carbon atom, 65 



- fats, 90 

 Urea, 50, 77, 137 



- test for, 182 

 Urease, 77, 182 

 Ureter, 138 

 Urethane for frog, 221 

 Uric acid, 137 

 Urinary bladder, 99 

 Utricle and saccule, 118 



VACUOLE, 20 

 Vagus nerve, 79, 149 



of frog, 217 



Value of experimental work, vi. 

 - of general principles, v. 

 Van der Waals' equation, 22 

 Vaso-constriction, 220 

 Vaso-constrictor nerves, 146 

 Vaso-dilatation, 220 



Vaso-dilator nerves, 146 

 Vaso-motor centres, 146 



- reflexes, 146 



- stimulation, 224 

 Vapour pressure, 23, 173 

 Variation, 152, 157 

 Veins, 134 



Velocity of ions, 25 



- of reactions, 68 

 Vena cava, 134 

 Venous blood, 87 

 Ventricle, 132 



Visceral nervous system, 131 



- sensory nerves, 131 

 Viscosity, 144 



- of blood, 144, 221 

 Visual purple, 114, 117, 212 

 Vitamines, 61 

 Voluntary contraction, 98 



- muscle, structure of, 195, 206 



WAR, 159 



Warm stage for microscope, 166 



Warming sinus, 225 



Waste products, 137 



Water culture, 183 



- effect of, on equilibrium position, 

 68 



- loss of, from body, 84 

 Water-soluble B-factor, 61 

 Wheatstone bridge, 175 

 Whiskers of cat, 106 

 Wireless telegraph, 113 

 Work, 10 



" Work-collector," 205 



X-RAYS, 113 



- use of, in investigating movements 

 of intestine, 78 



