16 MASS. EXPERIMENT STATION BULLETIN 411 



Hays, F. A 1936. Winter pause in Rhode Island Reds. Mass. Agr. Expt. Sta. 



Bui. 329. 

 Hays, F. A. 1936a. Studies on the inheritance of persistency. Genetics 



21:519-524. 

 Hays, F. A., and Ruby Sanborn. 1927. Intensity or rate of laying in relation 



to fecundity. Mass. Agr. Expt. Sta. Tech. Bui. 11. 

 Hays, F. A., and Ruby Sanborn. 1927a. Net correlations of characters con- 

 cerned in fecundity. Mass. Agr. Expt. Sta. Tech. Bui. 12. 

 Hays, F. A., and Ruby Sanborn. 1932. Types of intensity in Rhode Island 



Reds. Mass. Agr. E.xpt. Sta. Bui. 286. 

 Hays, F. A., and Ruby Sanborn. 1934. Breeding for egg production. Mass. 



" Agr. Expt. Sta. Bui. 307. 

 Jeffrey, F. P. 1938. The measurement of egg weight. Poultry Sci. 17 (3):179-186. 

 Jull,M.A. 1924. Egg weight in relation to production, I. Poultry Sci. 3 (3):77-88. 

 Jull, M. A. 1940. Poultry Breeding. John Wiley & Sons, New York, 328 pp. 

 JuU, M. A., and A. B. Godfrey. 1933. Mean annual egg w^eight in relation to 



mean weight of first ten eggs laid. Poultry Sci. 12 (5):310-312. 

 Knox, C. W., M. A. Jull, and J. P. Quinn. 1935. Correlation studies of egg 



production and possible genetic interpretations. Jour. Agr. Res. 50 (7): 



573-589. 

 Lerner, I. M., and L. W. Ta>lor. 1937. The measurements of sexual maturity 



and persistency. Poultry .Sci. 16:419-421. 

 Lerner, I. M., and L. W. Ta\lor. 1939. A statistical study of winter pause in 



White Leghorn pullets. Jour. Agr. Res. 59 (3):199-210. 

 Marble. D. R. 1931. A statistical study of factors affecting egg weight in the 



domestic fowl. Poultry Sci. 10 (2):84-92. 



