1905.] the Interstitial Cells of the Ovary in the Rabbit. 57 



Fig. 5. — Ovary of rabbit about 22nd day of pregnancy. Taken from the cortical 

 region. Fixed in sublimate solution : — 



a = germinal epithelium. 



b = primordial ovum. 



c = multi-nucleated interstitial cell. 



d = interstitial cell, becoming isolated. 



/ = connective tissue. 



g = modified germinal cells. 



Fig. 6. — 1 — 6 are taken from the ovaries of rabbits in the later stages of pregnancy, 

 la— 6a from ovaries of young rabbits : showing ovogenetic changes for comparison with 

 1 — 6. Fixed in Gilson's fluid : — 



1 = transition from interstitial to leptotenic phase in pregnant ovary. 

 1«= » » young „ 



2 = Leptotenic phase in pregnant ovary. 

 2a = „ young „ 



3 = Synaptenic phase in pregnant ovary. 

 3a = „ young „ 



4 = Pachytenic phase in pregnant ovary. 

 4a = „ young „ 



5 = Diplotenic phase in pregnant ovary. 

 ha = „ young „ 



6 = Dictyate phase in pregnant ovary. 

 6a = „ young „ 



