CHANGES IN THE OVARY 



129 



studied more fully by Boveri.i 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 the liquor foUiculi. (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., vpl. xxi., 1887. 



' 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 



