INDEX 



615 



Tumours, 367 

 Tnnicata, 317 



Urea, 109, 162, 17"), 305, 4H2 

 artificial sj'nthesis of, 23, 43 

 derivation of, 162 



Uric acid, 109, 162, 175, 305, 4K2 

 derivation of, 162 



Vacuoles, 81 



contractile, 82, 166 

 Vampyrella, food-selection by, 148, 527 

 Variability, individual, 185, 317 

 Vancheria, formation of globules by 



plotoplasm of, 94 

 Vermes, 317 

 Vertebrata, 317 

 Vie latente. 132 



Vital conditions, diagram of, 350 

 Vital force, doctrine of, 17, 18, 20, 31, 



41, 123 

 Vitalism, mechanical, 44 



psychical, 45 

 Vitellins, 108 

 Volta, 263 

 Vorticella, as reflex arc, 578 



chemical stimulation of, 368 



food-ingestion by, 145, 526 



Vorficella, mechanical stimulation of, 

 384, 388 

 myoidof, 242 



Wagner's hammer, 411 

 Warm-blooded animals, 217, 257 



heat-regulation in, 390 

 Warm stage, 392 



Water as constituent of living sub- 

 stance, 114 



as general vital condition, 279 



excretion of, 166, 174 

 Wheel-animalcules, desiccation of, 129 

 Wiihler, 23 

 Wolff, 17 

 World-formula, du Eois-Reymond's, 32 



Xanthix, 108, 109, 162, 175, 305, 482 



Yajukveda, 7 

 Yeast-cells, 111, 156 



action of temperature upon, 390 



narcosis of, 371 



production of heat by, 258 



See Saccharomyces 



Zoochlorellce, 84 

 Zooxanthdlm, 84 



Zygnema, behaviour of non-nucleated 

 pieces of, 513 



THE END 



RICHAnn CLAY AXD SONS, LIMITED LONDON AND Bl NiiAY, 



