32 TEXT-BOOK OF EMBRYOLOGY. 



not followed by fertilization the corpus luteum reaches the height of its develop- 

 ment in about twelve days, and within a few weeks has almost wholly disap- 

 peared. If, on the other hand, pregnancy supervenes, the corpus luteum be- 

 comes much larger, does not reach its maximum development until the fifth or 

 sixth month and is still present at the end of pregnancy. The above differences 

 have led to the distinction of the corpus luteum of pregnancy or the true corpus 

 luteum, and the corpus luteum of menstruation, or the false corpus luteum, al- 

 though there are no actual microscopic differences between the two. 



References for Further Study. 



BOVERI, T.: Zellstudien. Jena, 1887-1901. 



BUCHNER, P.: Praktikum der Zellenlehre, Erster Teil, Berlin, 1915. 



CHILD, C. M.: Studies on the Relation between Amitosis and Mitosis. Biolog. Bull., 

 Vol. XII, Nos. 2, 3, 4; Vol. XIII, No. 3, 1907. 



CONKLIN, E. G.: The Embryology of Crepidula. Jour, of Morphol., Vol. XIII, 1897. 



CRAGIN, E. B.: Text-book of Obstetrics, 1915. 



HERTWIG, R.: Eireife, Befruchtung u. Furchungsprozess. In Hertwig's Handbuch der 

 vergleichenden u. experimentellen Entwickelungslehre der Wirbeltiere. Bd. I, Teil I, 1903. 

 Also contains extensive bibliography. 



KEIBEL, F. and MALL, F. P.: Manual of Human Embryology. Vol. I, Chap. VII, 

 Philadelphia, 1910. 



KELLICOTT, W. E.: General Embryology, 1913. 



LONG, J. A. and MARK, E. L.: The Maturation of the Mouse Ovum. Carnegie Insti- 

 tution, Washington, D. C., 1911. 



MORGAN, T. H.: Heredity and Sex, 1913. 



SOBOTTA, J.: Die Befruchtung und Furchung des EiesderMaus. Archiv f. mik. Anato- 

 mie; Bd. XLV, 1895. 



SOBOTTA, J.: Ueber die Bildung des Corpus luteum beim Meerschweinchen. Anal. 

 Hefte, Bd. XXXII, Heft XCVI, 1906. 



VON LENHOSSEK, M.: Untersuchungen liber Spermatogenese. Archiv f. mik. Anatomie, 

 Bd. LI, 1898. 



WILLIAMS, J. W.: Text-book of Obstetrics. New York, 1903. 



WILSON, E. B.: The Cell in Development and Inheritance. 2d Ed., 1900. 



WILSON, E. B. : Observation on the Maturation Phenomena in Certain Hemiptera. Jour, 

 of Exper. Zool., Vol. 13, 1912. 



