INDEX 



457 



Vascular tubules of plants, 131 



Vaucheria, reproduction in, 177 



Vegetable cells, 97 



Vense cavse, 142 



Venus' fly-trap, 35, 36 



Vernon on sex determination, 230 



Verworn, 53 



Vesication, 60 



Virgil on spontaneous genera- 

 tion, 21 



Virulence, 350 



Viscera, regeneration of, 401 



Vision, development of, 162 



Vitalists, 81 



Vitreous body, 163 



Volvox, 120 



globator, 117, 119 



Von Baer, 202, 222 

 on classification, 296 



Von Eiselberg on transplanta- 

 tion, 414 



Vorticella, conductivity in, 70 

 mechanical stimulation of, 45 

 nucleus of, 99 



w 



WALDEYER, 104 



Wallace and evolution, 276 



Warm-blooded animals, effect of 



temperature on, 39 

 Wassermann and Schultze on 



blood, 306 



Water, stimulating influence of, 

 50 



vascular system, 132 

 Weismann on chromosomes, 104 



Weismann on Spencer's theory 



of heredity, 239 

 Weismann's theory of germ 



plasm, 247 



White blood-corpuscles, develop- 

 ment of, 135 

 granules of, 95 

 Wilson on sex determination, 232 



on Weismann's theory, 254 

 Wilson (H. V.), 390 

 Wilt disease of cucumbers, 320 

 Wolff, Caspar Frederick, 201 

 Woodruff, 172 



Worms, locomotor apparatus of, 

 128 



vascular system of, 132 

 Wounds, healing of, 400 

 Wright and opsonins, 375 



X 



X-ELEMENT in sex determination, 

 232 



YOLK, 204 



Young on sex determination, 230 



Youth, 91 



ZONA pellucida, 100 

 Zooprecipitins, 305 

 Zoospore, 178 

 Zygospore, 181 

 Zygotes, 177 



