158 MAINi: AGRICUIvTURAI, EXPERIME;nT STATION. I909. 

 ■. 1906. 



Fertility of Eggs. 



Experiment Station Work,'No. XXXIV (Farmers' Bulletin 



No. 251) pp. 18-22. 



Gives an excellent brief summary of the published data 

 on factors influencing fertility, up to the date of its appear- 

 ance. 



Atwood, H. 1909. 



A Few Preliminary Experiments on the Effect of the Age 

 of the Parents upon the Vigor of Chickens. 

 Amer. Breeders' Association. Vol. V, pp. 385-389. 



Comparison of pullets' and hens' eggs with reference to 

 fertility and hatching quality. 



Barfurth, D. 1896. 



Versuche iiber die parthenogenetische Furchung des 

 Hiihnereies. Arch. f. Entwicklungsmech. Vol. 2, pp. 



303-351- 



Data on persistence of fertility after removal of male. 

 Detailed account of the results of incubating "virgin" eggs. 

 Data on the vitality of spermatozoa. 



Blount, Mary. 1907. 



The Early Development of the Pigeon's Egg with Especial 

 Reference to the Supernumerary Sperm Nuclei, the 

 Periblast and the Germ Wall. Biol. Bulletin. Vol. XIII 



. 1909. 



The Early Development of the Pigeon's Egg, with Especial 

 Reference to Polyspermy and the Origin of the Periblast 

 Nuclei. Jour. Morphol. Vol. XX, No. i, pp. 2.64. 



This and the preceding paper deal with certain phases of 

 the morphology of the fertilization of the egg in birds. 



Brittin, W. F. 1905. 



A Hatching Experiment. 



Rel. Poult. Jour. Vol. 12, No. 2, p. 237. 



Effect of ration on hatching of eggs, particularly influ- 

 ence of feeding oyster shell. Obtained better results with- 

 out it. 



Brown, E. T. 1906. 



Some Practical Observations on Fertile Eggs. 

 Farm Poultry, Vol. XVII, No. 2, p. 29. 

 General discussion. 



