PLATE I. 



Chickadee at Nesting Box with Caterpillar for its Young. 



This feeding of the young birds is continued all day at intervals of a few minutes. (Original 

 photograph.) (From Economic Biology, Bulletin No. 2, The Domestic Cat.) 



The Biuu-KiLLi.NG Cat. 



The destruction of birds by cats is illustrated in Economic Biology, Bulletin No. 2, published 

 by the Massachusetts State Board of .\griculture. (Photograph by William L. Finley.) 



