BIBLIOGRAPHY 427 



Pearl and Curtis, Liberation of Ova from Ovary. Journ. Exper. 



Zoology, 1914, XVII, pp. 395-424. 

 and GovvEN, John W. Inheritance of a Subtle Blood- 

 character. Proc. Soc. Exper. Biology and Medicine, 19 14, 



XII, p. 48. 

 and ScHOPPE, W. F. Anatomical Basis of Fertility. Journ. 



Exper. Zool., 1921, XXXIV, 101-118, 2 figs. 

 and Surface, F. M. Shell-making. Science, 1909, XXIX, 



pp. 420-429. 

 A Biometrical Study of Egg Production in the Domestic 



Fowl. U.S. Dept. of Agric, Bulletin no. 

 PfizARD. Effect of Castration. Comptes Rendus Acad. Sci. 



Paris, 1915, CLX, pp. 260-263, i fig. 

 Philipps, John C. Blending in Ducks. Journ. Exper. Zoology, 



1915, XVIII, pp. 69-112, 9 pis. 

 PoHLMANN, A. G. Process of Hatching. Anat. Record, 1919, 



XVII, pp. 89-104, 2 charts. 

 Poll, H. Sterility of Hybrid Birds. Archiv mikroskopische 



Anatomie, 191 1, LXXVIII, pp. 63-127, 4 pis., i fig. 

 Sterility of Hybrid Ducks. Archiv mikroskopische 



Anatomie, 191 1, LXXVII, pp. 210-239, i pi., 3 figs. 

 PoYNTER,' C. W. M. AbnormaUties in Early Development. 



Anat. Record, 1919, XVI, pp. 1-23, 12 figs. 

 PuNNETT, R. C. Mendelism. Revised edition, 1919. 

 Pycraft, W. p. The Emperor and Adelie Penguins. National 



Antarctic Expedition, Zoology, vol. ii, 1907. 

 A History of Birds. London, 1910, pp. 458, 50 figs. An 



invaluable treatise. 



Birds in Flight. London, 1922. 



Reese, A. M. Outlines of Economic Zoology. Philadelphia, 



1919, pp. 316. 

 Retterer, E., and Lelievre, A. Ossified Tendons. Comptes 



Rendus Soc. Biologie, Paris, 1911, LXXI, pp. 596-599- 

 Riddle, O. Masculine Female Pigeons. Yearbook Carnegie 



Institution, Washington, 1914, XIII, pp. 117-119. 

 Growth of Ovum. Amer. Journ. of Physiology, 19 16, XI, 



pp. 387-437. 

 Determination of Sex in Pigeons. Journ. Exper. Zoology, 



1918, XXVI, pp. 227-254. 



Determination of Sex in Pigeons. Journ. Acad. Science, 



Washington, 1917, VII, pp. 319-356- 



Variations in Pigeons. Proc. Soc. Exper. Biology, 1917, 



XV, pp. 56-58. 



and Basset, G. C. Effect of Alcohol on Fowls. Amer. 



Journ. Physiology, 1916, XI, pp. 387-437. 



