90 THE WILSON BULLETIN— June, 1921 



July 5, 1909, was killed by a Shrike at Evansville, Illiuois, 

 April 1, 1912. 



All these and a host of other interesting', inviting and 

 important questions yet remain to be answered more fully. 

 The opportunities are large; the workers are few; only a 

 bare beginning has been made. 



In conclusion — the results already obtained from bird 

 banding have justified its practice; bnt the work should 

 not devolve upon a limited number of |)ersons. It should 

 be made the duty and the effort of many individuals and 

 organizations for it is only by carrying on the work in an 

 extensive way that large and valuable results can be ob- 

 tained. With the plan now headed by the United States 

 Biological Survey renewed energy and activity should 

 greet the efforts of this active and efficient branch of the 

 Federal Department of Agriculture. 



The writer would take tliis final opportunity^ of em- 

 phasizing to the members of the Wilson Ornithological 

 Club the desirability of their cooperation in furthering the 

 work of bird banding and in seeing to it that every banded 

 bird which is secured shall have a "return" record sent to 

 the proper authorities. 



COMPARATI^'E PERIODS OF ^'ESTL1NG LIFE 

 OF SOME NORTH AMERICAN NIDICOL.^ 



BY FRANK L. BURNS 

 [continued from LAST ISSL^e] 



Again to show the fine detailed work of some of oar 

 observers, I have assembled a table exhibiting day by day 

 the increase in weight (in grams) of some nestlings taken 

 in 1906 by the late John F. Ferry, Lake Forest, 111. The 

 Cedar Waxwing study (Aug. 20-28) is incomplete, but the 

 development and length of nestling life of the Cowbird 

 (June 11-22), Yellow Warbler (June 21-July 2) and AVood 

 Thrush (June 11-22), exhibit a relatively slower growth, 

 considering size, than the Catbird (June lo-24) and the 

 Brown Thrasher (July 8-19). 



