SEPTEMBER, 1913 



BULLETIN 318 



CORNELL UNIVERSITY 



AGRICULTURAL EXPERIMENT STATION OF 



THE COLLEGE OF AGRICULTURE 



Department of Poultry Husbandry 



CONSTITUTIONAL VIGOR IN POULTRY 



Under the direction of 

 JAMES E. RICE 



By C. a. ROGERS 



ITHACA, N. Y. 

 PUBLISHED BY THE UNIVERSITY 



