334 



LECTURES ON BIOLOGY 



Variability of species. 141 

 Variations, 142 

 Venus's fly-trap, 66 

 Verworn, 28, 76 

 Vinegar- eel worm, 46 

 Virchow, 79 

 Vis vitalis, 47, 50 

 Vital affinity, 304 

 Vitalism, 51 

 Volvocidal, 244 

 Volvox, 245 

 Vorticella, 221, 230 

 Vries, De, 206 



WAGNER, 69, 175 

 Walking-leaf, 165 

 Wander-spores, 231 

 Wasmann, 184 

 Waste of life in nature, 157 

 Water-beetle, great, 195 



Water- cultures, 197 



Water-flea, 133, 263 



Water pressure, 34 



Weasel, 161 



Weismann, 3, 122, 136, 186, 187, 214, 



226, 264, 302, 324 

 Whales, 23, 123 

 Winter-eggs of insects, 265 

 Wohler, 51 

 Wolff, G. 203 

 Wolff, J., 52 

 Wundt, 57 



Xylina vetusta, 165 

 'YELLOW underwings,' 166 



Zea mays, 206 

 Zocea, 134 



JOHN BALE, SONS & DAXIKLSSON, Ltd., 83-91, Great Titchtield Street, W. 



