Fig, 53. ■ -rfoierican Bittern on its nest, 'obliterated' by picturo- 

 patterii based on counter-shading. (The 'reed-stripes' mentioned in 

 the text are here not in full operation. ^ 



Photogfrapbed from life by E. G. Tabor. 



Fig. 54. Nesting Virginia Rail, 'obliterated' by counter-shading 

 and background-picturing pattern. 



Photographed from life by E. i>. Tabor, 



Fig. 55. TVilson's Tern on its nest. (Counter-shading and) 'ruptive' pattern. 

 Photo^aphed from life by Francis H. Herrick. Courtesy also of G. P. PutDam's Sons. 



