Early Development of the Hen's Egg. 123 



7. In each egg the first horizontal cleavage plane marks the posi- 

 tion of the segmentation cavity. 



Austin, Texas, November S, 1909. 



LITERATURE. 



Babfubti^ D., 1895. Versuche iiber die Parthenogenetiscbe Forschung des 

 Hiibuereies. Arcbiv f. Entw. Mecb., Bd. 2, pp. 303-351. 



Blount, Mary, 1909. Tbe Early Development of tbe Pigeon's Egg, witb espe- 

 cial Reference to Polyspermy and tbe Origin of the Periblast Nuclei. 

 Journal of Morphology, Vol. 20, No. 1, pp. 1-64. 



Duval, M., 1884. De la Formation du Blastoderme dans I'ceuf d'oiseau. An- 

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GuYER, M., 19<J9. The Spermatogenesis of tbe Domestic Chicken {Gallus gallus 

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Harper, E. H., 1904. The Fertilization and Early Development of tbe Pigeon's 

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Kionka, H., 1894. -Die Forschung des Hiihnereies. Anat. Hefte, Bd. 3, pp. 

 395-443. 



LiLLiE. F. R., 1908. Tbe Development of the Chick. New York, Henry Holt 

 & Co. 



Patterson, J. Thomas, 1909. Gastrulation in tbe Pigeon's Egg — A Morpho- 

 logical and Experimental Study. Journal of Morphology, Vol. 20, pp. 

 65-123. 



ScuAuiNSLAND, H., 1899. Beitrjlge zur Biologie und Entwickelung der Hatteria 

 nebst Bemerkungen iiber die Entwickelung der Sauropsiden. Anat. 

 Anz., Bd. 15, pp. 309-334. 



