THE 



WILSON BULLETIN 



NO. 83. 



A QUARTERLY JOURNAL OF ORNITHOLOGY 



VOL. XXV JUNE, 1913. NO. 2 



OLD SERIES VOL. XXV. NEW SERIES VOL XX 



A STUDY OF THE NESTING BEHAVIOR OF THE 

 YELLOW WARBLER {Dendroica cBStiva csstiva). 



by harry c. bigglestone. 



Introduction. 



The data upon which this paper is based was obtained dur- 

 ing the summer session of 1912, of the Macbride Lakeside 

 Laboratory, on Lake Okoboji, Iowa, to the director of which 

 I wish to express my obhgation. With the exception of about 

 six hours, the nest was constantly under observation during 

 the feeding hours of the day, from 4:15 p. m. on July 2 until 

 the last nestling left the nest on July 12 at 6 :28 a. m. 



I wish especially to thank Prof. T. C. Stephens for sug- 

 gesting to me this piece of work, and also for assistance in 

 bringing it to completion. I owe my thanks to Mr. Ira N. 

 Gabrielson, from whom I obtained many valuable ideas for 

 carrying on the observations. It would have been impossible 

 for one individual to carry out the continuous program in- 

 volved in this work. Relief at meal time and other periods 

 of the day was freely given by students of the laboratory, 

 and for this I am under obligation to the following: Miss 

 Hudson, Miss Nellie D. Fisher, Messrs. H. S. Doty, G. A. 

 Muilenburg, J. Weaver, P. J. Kruse, D. H. Boot, M. O. 

 Insko, A. H. Schatz, C. H. Farr, and Prof. A. O. Thomas. 



