INHERITANCE OF FECUNDITY IN DOMESTIC EOWE. 393 



(21) JoHANNSEN, W. IQ09 Elemente dcr exakten Erblichkeitslehre. 



Jena. 



(22) 191 1 The genotype conception of heredity. Amer. Nat, 

 vol. 45, pp. 129-159. 



(23) Laughijn, H. H. IQI1-1912 The inheritance of color in short- 



horn cattle. Amer. Nat., vol. 45, pp. 705-742, and vol. 46, 

 pp. 1-28. 



(24) Nilsson-EhlE, H. 1909 Kreuzungsuntersuchungen an Hafer 



und Weizen. .Lands Univ. Arsstkr., N. F., Afd. 2, Bd. 5, 

 Nr. 2, pp. 1-122. 



(25) 1911 Kreuzungsuntersuchungen an Hafer und Weizen. 

 II. Ibid. Bd. 7, pp. 1-34. 



(26 Pearl, R. 1910 The relation of the results obtained in breeding 

 poultry for increased egg production to the problem of 

 selection. Rpt. 30th Meeting Soc. Proc. Agr. Sci., pp. 

 (of reprint) 1-8. 



(27) 191 1 a Inheritance in 'blood lines' in breeding animals 

 for performance, with special reference to the '200-egg' 

 hen. Ann. Rpt. Amer. Breeders' Assoc, vol. 6, pp. 317- 

 326. 



(28) 1911 b Inheritance of fecundity in the domestic fowl. 

 Amer. Nat., vol. 45, pp. 321-345. 



(29) 191 1 c Biometric arguments regarding the genotype 

 concept. Amer. Naturalist, vol. 45, pp. 561-566. 



(30) 1911 d Breeding poultry for egg production. Me. Agr. 

 Expt. Sta. Ann. Rept. for 1911, pp. 113-176. 



(31) 191 1 e On the accuracy of trap-nest records. Ibid., pp. 

 186-193. 191 1 i The personal equation in breeding ex- 

 periments involving certain characters of maize. Biol. 

 Bulletin, vol. 21, pp. 339-366: 



(33) Pearl, R. and Curtis, M. R. 1912 Studies on the physiology 



of reproduction in the domestic fowl. V. Data regard- 

 ing the physiology of the oviduct. Jour. Exp. Z06I., vol. 

 12 pp. 99-132. 



(34) Pearl, R., and St^ri^ace, F. M. 1909 a Data on the inheritance 



of fecundity obtained from the records of egg produc- 

 tion in the daughters of '200-egg' hens. Me. Agr. Exp. 

 Stat. Ann. Rpt. for 1909, pp. 49-84 (Bulletin 166). 



(35) 1909 b Studies on the physiology of reproduction in 

 the domestic fowl. IV Data on certain factors influenc- 

 ing the fertility and hatching of eggs. Me. Agr. Exp. 

 Stat. Ann. Rpt. for 1909, pp. 105-164. 



(36) 1909 c A biometrical study of egg production in the 

 domestic fowl. I. Variation in annual egg production. 

 U. S. Dept., Agr. Bur. Anim. Ind. Bulletin no, pp. 1-80. 



(37) 191 1 A biometrical study of egg production in the do- 

 mestic fowl. II. Seasonal distribution of egg produc- 

 tion. Ibid. Part 11, pp. 81-170. 



