Index 



387 



Uranus, 15 



Urea, 47 



Ureidosuccinic acid, 47, 48 



Uvular ia, 119 



Vagility, 112 

 Variability, 59, 



amount of, 139 

 Variants, fate of, 61 



origin of, 61 

 Venus, 15 



Viable mutations, 79 

 Viola, 201 



Virgularia presbijtes, 140 

 Viruses, 30, 71 

 Vitamins, 35, 44, 47 

 Volcanic activity, 329 

 Volcanoes, 273 

 Voles, 144 

 Von Baer, 2 



W 



Wallace, Alfred Russell, 3 

 Warning coloration, 237, 238 



Water, 44 



Water molecules, orientation of, 50 



Water snake, 104 



Water vapor, 27, 45 



Weevils, 157, 198 



Wheat, 202 



Wheat savvfly, 131 



Whooping crane, 126 



Wind, 273 



Wind pollination, 235 



Wisconsin ice sheet, 134, 173 



Wormaldia, 310 



X 



Xeric flora, southwestern, 147 

 Xylopaguriis, 245 



Yeasts, 55 

 Yellowpine biome, 255 



Zaglossus, 309 



