3i8 INDEX 



Use, inherited effects of, 59 



Virgin births, belief in, 296 

 Voice in birds, 123 



Wallace, Alfred Russell, and 

 Sexual Selection, 13, 137, 196 



Warblers, play in, 121 



Water-fleas, olfactory organs of, 

 261 



mating apparatus 



Water-fleas, 



of, 226 



Weismann, Professor, on colora- 

 tion of butterflies, 187 

 Whales, armature of, 89 

 — battering-rams of, 179-89 

 Wheel-animalcule, vitality of, 



307 

 Windpipes, where coiled, 128 



Zebras, fighting among, 71 



Printed at The Chapel River Press, Kingston, Surrey. 



