90 



BOARD OF AGRICULTURE. [Pub. Doc. 



domiciles make excellent hiding places for gypsy moths when 

 the birds are through with them, and men employed to destroy 

 the moths are likely to break open or burn nesting boxes unless 



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Fig 1. — Perspective and sectional drawings of an 

 imp^o^^sed nest box for the interior of build- 

 ings. (After Biological Survey.) 



Fig. 2. — Xest box opening at 

 the top. (After Biological 

 Survey.) 



<- 8^8 ^ t^-.^Vz > 



Fig. 3. — Nesting box for bluebirds, with details showing how the top may be removed quickly 

 by pulling two nails slid loosely into holes prepared for them. 



they can be opened without trouble. Boxes intended for the 

 inside of a building (see Figs. 1 and 2) may be utilized, and 

 might be adapted for outdoor use, but the means of opening 

 them is rather too obvious to human marauders. The box 



