638 GENETICS IN RELATION TO AGRICULTURE 



PAYNE, F., 1911. Drosophila ampelophila bred in the dark for sixty-nine generations. 



Biol Bull. 21. 

 PEARL, R., 1908-16. Papers on genetics and breeding by Pearl et al; bibliography in 



Castle and Morgan. 



1911. Breeding poultry for egg production. Me. A.E.S. Bull., 192. 



1915. "Modes of Research in Genetics," New York. 



1915a. A system of recording types of mating in experimental breeding opera- 

 tions. Science, n.s., 42, 1081. 



191 5a. Seventeen years' selection of a character showing sex-inked Mendelian 

 inheritance. Am. Nat., 49. 



1916. Some effects of the continued administration of alcohol to the domestic 

 fowl, with specific reference to the progeny. Proc. Nat. Acad. Sci., 2. 



1917. The probable error of a difference and the selection problem. Genetics, 

 2, 1. 



1917a. The probable error of a Mendelian class frequency. Am. Nat., 51. 



19176. The selection problem. Ibid. 



1917c. The change of milk flow with age. Me. A.E.S. Bull., 262. 

 PEARL, R., and BARTLETT, J. M., 1911. The Mendelian inheritance of certain chem- 

 ical characters in maize. Zeit. ind. Abs. Vererb., 6. 

 PEARL, R., and PARSHLEY, H. M., 1913. Data on Sex Determination in Cattle. 



Biol. Bull, 24. 

 PEARL, R., and SALAMAN, R. N., 1913. The relative time of fertilization of the ovum 



and the sex ratio among Jews. Am. Anthrop., 15. 

 PEARL, R., and SURFACE, F. M., 1909. Selection index numbers and their use in 



breeding. Am. Nat., 43. 



1909a. Inheritance of fecundity. Me. A.E.S. Bull. 166. 



1915. Studies in bean breeding. I. Standard types of yellow-eye beans. 



Maine A.E.S., Bull. 239. 

 PEARSON, K., 1900. "Grammar of Science," London. 



Numerous papers in Proc Royal Soc., Biometnka, Science, etc. 



1914. "Tables for Statisticians and Biometricians " Cambridge Univ. Press. 

 PHILLIPS, J. C., 1912. Note on wildness in ducklings. Jour. An. Behav., 2. 



1912o. Size inheritance in ducks. Jour. Exp. Zool., 12. 



1913. Reciprocal crosses between the Reeves and common pheasant. Am. 

 Nat., 47. 



1914. A further study of inheritance of size in ducks. Jour. Exp. Zool., 16. 



1915. Notes on American and old world English sparrows. Auk, 32. 

 PICKERING, S. IT., 1911. Experimental error in horticulture work. Jour. Bd. Agr. 



(London), 7 (Sup.). 

 PIPER, C. V., 1908. The search for new leguminous forage crops. Yearbook 



U.S.D.A. 



1910. Standardization of field experimental methods in agronomy. Proc. Am. 



Soc. Agron., 2. 

 PLATE, L., 1913. "Selektionsprinzip und Probleme der Artbildung," Leipzig. 



1913a. "Vererbungslehre," Leipzig. 

 PLOUGH, H. H., 1917. The effect of temperature on crossing-over. Jour. Exp. 



Zool., 24. 

 POPE, M. N., 1916. The mode of pollination in some farm crops. Jour. Am. Soc. 



Agron., 8. 



POPENOE, P., 1914. Plant chimeras. Jour. Hered., 5. 

 POTTER, E. L., 1917. "Western Live Stock Management," New York. 

 POWELL, G. F., 1916. The transmission of productive and other qualities in the 



