PLATE I. 



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

 vania. This 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. E. C. Ware, Wareham, Massachusetts. Male blue- 

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

 farm . ) 



