INDEX 269 



White ants, 125 Youth, growth of brain, 229 

 Whitebait, 137 instinct in, 238, 243 



Wings, 97, 108, 240 mind of, 254 



Wolf, 86, 96, 184, 220 purpose of, 222 



Wolf-fish, 135 spirits of, 245 



spiders, 123 summary of, 254 



Woodcock, 78, 1 60 Yung, E., 203 

 Woodpeckers, 102, 149, 153, 161 

 Wood-pigeons, 207 



Worms, 118, 120, 192, 233 ZEBRAS, 45, 75, 95, 115, 172. 217 



Wren, 49 Zebra-duiker, 89 



Zoea, 29 



YOLK, 163 Zoological Gardens, London, 38, 41, 51, 

 Youth, definition, i, 3 86, 124, 147, 150, 158, 165, 166, 



duration, 37, 40, 47, 54, 55. 225 168, 194. 201, 208, 212, 214, 218, 



games, 246 247 



