PLATE y^U.—Coniviued. 



Fig. 35 b. — Longitudinal section through part of the Woltfiau body 

 and tlie anterior end of the ovary of an eighteen days' embryo, to show 

 the derivation of tubuliferous tissue (/.) from the Malpighian bodies, close 

 to the anterior extremity of the ovary. Zeiss, a, ocul. 1. 



Fig. 36. — Transverse section through the ovary of an embryo rabbit of 

 tveenty-two days, hardened in osmic acid. It is coloured in tlie same 

 manner as fig. 35. Zeiss, a, ocul. 2. 



Fig. 36 a. — Transverse section through a small part of the ovary of an 

 embryo, from the same female as fig. 36, hardened in picric acid, showing 

 the relation of the germinal epithelium to the stroma of the ovary. 

 Zeiss, D D, ocul, 2. 



Figs. 37 and 37 a. — The same parts of an ovary of a twenty-eight days' 

 embryo as iigs. 36 and 36 a of a twenty-two days' embryo. 



Fig. 38. — Ovary of a rabbit five days after birth, coloured in the same 

 manner as figs. 35, 36, and 37, but represented on a somewhat smaller 

 scale. Picric acid. 



Fig. 38 a. — Vertical section through a small part of the surface of the 

 same ovary as fig. 38. .^eiss, D d, ocul. 2. 



Fig. 38 b. — Small portion of the deeper layer of the germinal epithelium 

 of the same ovary as fig. 38. The figure shows the commencing difi'ercn- 

 tiation of the cells of the germinal epithelium into true ova and follicle 

 cells. Zeiss, dd, ocul. 2. 



Fig. 39 a. — Section through a small part of the middle region of the 

 germinal epithelium of a rabbit seven days after birth. Zeiss, d d, ocul. 2. 



Fig. 39 b. — Section through a small part of the innermost layer of the 

 germinal epithelium of a rabbit seven days after birth, showing the forma- 

 tion of Graafian follicles. Zeiss, d d, ocul. 2. 



Figs. 40 a and 40 b. — Small portions of the middle region of the ger- 

 minal epithelium of a rabbit four weeks after birth. Zeiss, u d, ocul. 2. 



Fig. 41. — Graafian follicle with two ova, about to divide into two folli- 

 cles, from a rabbit six weeks after birth. Zeiss, dd, ocul. 2. 



