41. 



INDEX 



Trajectory of wing, 

 Turnstone, 352 



218-223 



Valves of heart, 72, 73 



of veins, Ji 

 Veins, 70, 71 

 Ventricle of heart, 69 



Waders, 386 

 Warblers, 359 

 Warm-blooded animals, 48, 96, 



104, 105 

 Water- ouzel, 387 

 Weight and wing area, 261 

 Wind {see Flight), 231, 234, 235, 



237 



Windpipe, see Trachea 

 Wing, area of, 261 



Digits of, 209, 210 



as lever, 173-180 



Membranes of, 201 



Narrow, 190 



Trajectory of, 218-223 

 Wings, move unequally (?), 250 

 Woodpecker, 62, 154, 163-165, 214, 



386 

 Wren, Golden-crested, 226, 295, 

 349 



Yolk, 277 



Y oik- sack, 281 



Young birds, 108, 286 





THE END 





RICHARD CI. AY AND SONS, LIMITED, LONDON AND BUN'GAV. 



