120 H. D. GOODALE AND GRACE MACMULLEN 



LITERATURE CITED 



Castle, W. E. 1915 Some experiments in mass selection. Am. Nat., vol. 49. 



1916 Can selection cause genetic change? Am. Nat., vol. 50. 

 Dryden, J. 1916 Poultry breeding and management. Springfield. 

 GooDALE, H. D. 1918 Internal factors influencing egg production in the 



Rhode Island Red breed of domestic fowl. Am. Nat., vol. 52. 

 Pearl, R. 1912 The mode of inheritance of fecundity in the domestic fowl. 



Jour. Exp. Zool., vol. 13; also Maine Agri. Exp. Sta. Bui. 205. 



1915a Seventeen years' selection of a character showing sex-linked 



Mendelian inheritance. Am. Nat., vol. 49. 



1915b Mendelian inheritance of fecundity in the domestic fowl and 



average flock production. Am. Nat., vol. 49. 



