16 



MR. P. H. BAHR ON THE 



[Jan. 15, 



bleating, with a good field-glass. " The air pressing between the 

 wings and the tail (a natural parachute) causes all the feathers of 

 the tail and wings to vibrate and gives rise to the bleating sound 

 — which is modified by stronger or weaker vibrations." 



Text-fiff. 3. 



a. Snipe bleating, showing- characteristic position. 

 6. Formation of tail as ordinarilj' held in flight. 



