NESTING BOXES 



375 



Nest-boxes, and especially their holes, should, of 

 course, be of different sizes, according to the birds that 

 are to inhabit them. The opening is always round, and 

 is of varying size according to the species. Many 

 directions as to these are given in a paper by Baron von 

 Berlepsch, " On the Protection of Birds Generally," 

 published by the German Association for the Protection 

 of the Bird World, and also by publications of the Royal 

 Society for the Protection of Birds in Hanover Square, 

 London, 



Nesting Boxes on Poles. 



The following are some approximate measurements 

 for nest-boxes : 



For Titmice : 



height, n^ inches; 



depth from back to front, 4^ inches ; 



diameter of round opening, i inches. 



For birds of the size of a Starling : 



height, 18^ inches ; 



depth back to front, 9 inches ; 



diameter of opening, i J inches. 



