PLATE I. 



Fig. 1. — Martin box, made by Mr. J. Warren .Jacobs of Waynesburg, Pennsyl- 

 vania. Tliis forms part of a nesting colony on the estate of Mr. Edward 

 L. Parker at Concord, Massachusetts. (Original photograph.) 



Fig. 2. ^ Swallow box, made by Mr. K. C. Ware, Wari'luun, Ma.-^,sacliu>ctis. .Male 

 bluebird bringing insects to its young. (Original photograph taken on the author's 

 farm.) 



