20 



METHODS OF ATTRACTING BIRDS 



so that it can be opened, and inside is fastened 

 a pane of glass. By this means the door can 

 be opened by any one who wishes and a close 



OBSERVATION BOX CLOSED 



observation made of what passes inside ; but the 

 door should be kept closed at all other times to 

 protect the young birds from the sun's heat. It 

 should be so situated that the sun cannot shine 

 in when the door is open. 



