CHANGES IN THE OVARY 



129 



studied more fully by Boveri. 1 In recent years Montgomery 2 

 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 the 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. 



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



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

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

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

 this paper. 



I 



