CHANGES IN THE OVARY 129 



studied more fully by Boveri.^ In recent years Montgomery '^ 

 has elucidated the process still further by showing that prior 

 to the formation of the first polar body the chromatin filaments 



Fig. 32. — Human ovum examined fresh in tiie liquor folliculi. (From 

 Waldeyer.) The ovum shows yolk granules in. the centre surrounding 

 the nucleus (with its nucleolus) and a clearer peripheral portion. It 

 is enclosed by follicular epithelial cells. 



' Boveri, " Zellenstudien," Jenaische Zeitsch., vol. xxi., 1887. 



' Montgomery, "Some Observations and Considerations upon the Matura- 

 tion Phenomena of the Germ Cells," Siol. Bull., vol. vi., 1904. The references 

 to Montgomery's earlier memoirs dealing with the same subject are given in 

 this paper. 



I 



