248 Birds of Oregon and Washington 



about two inches from the top, and a shelf a 

 little below the entrance. Bird-boxes should be 

 deeper than they are wide, in this case, the 

 box would be seven inches deep. 



For Swallows, the box should be 8x6x6 

 inches ; location of hole and shelf, as before ; size 

 of hole, one and one-half inches. 



For Bluebirds, 10 x 6 x 6 ; entrance, nearer 

 the bottom; hole, 2x2^ inches in diameter; 

 shelf, if desired. 



For Martins, 10 x 8 x 8 ; entrance, 2^ inches, 

 and near the top, with or without shelf. 



Boxes in trees about the house are excellent, 

 and Woodpeckers, Chickadees, and Nuthatches 

 may be added to the domestic bird-circle. 



A Wren-box will do for the Chickadees ; for 

 the Nuthatches, the box should be 20 x 6 x 6 

 (20 inches deep) ; entrance near the top, 2x2^ 

 inches ; no shelf. 



For the Woodpeckers, the box should be from 

 i o to 36 inches in depth, and from 5 to 7 inches 

 square at the base ; entrance, 2x4 inches, and 

 near the top ; no shelf. 



The boxes for the Chickadees should be placed 

 from six to twelve feet from the ground ; for the 



