i I \\.\llo\ 01 I'l \ 28. XX 



ovuni Primitive ovum. /. Tiibiiliferous tis ,i;. from Mal- 



I''ik r - 35- I .;htccn 



, hardened in osiiur .ind. The o>|omx employ, to render clear 



the distinction between tin- ^eiminal epithelium (.^f.) and the tubuliferous tis*u< 

 which has grown in from the \Vollti.in body, an. I whith gives ri.-.c in the male to part* 

 of the tuhuli seminiferi. Xeiss A, ocul. 2. 



tion through a small part <>f t! : an embryo 



from the same female as lig. \~, hardened in picric acid, shewn >n of the 



germinal epithelium to the subjacent t; I'l), ocul. 2. 



Fig. 35 B. Longitudinal section through part of the WollTian ho-iy and the ante- 

 rior end of the ovary of an eighteen days' embryo, to shew the derivation of tubu- 

 liferous tissue (/.) from the Malpighian bodies, clo>e to the anterior extremity of the 

 ovary. Zeiss A, ocul. i. 



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

 two days, hardened in osmic acid. It is coloured in the same manner as fu 

 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, shewing 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 

 figs. 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 

 fig 5 - 35 > S^ 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. Zeiss 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 shews the commencing differentiation of the cells 

 of the germinal epithelium into true ova and follicle cells. Zeiss D D, ocul. i. 



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. a. 



Fig. 39 B. Section through a small part of the innermost layer of the germinal 

 epithelium of a rabbit seven days after birth, shewing the formation of Graatian folli- 

 cles. Zeiss D D, ocul. 2. 



Figs. 40 A and 40 B. Small portions of the middle region of the germinal t 

 Hum of a rabbit four weeks after birth. Zeiss 1 > D, ocul. i. 



Fig. 41. Graafian follicle with two ova, about to divide into two follicles, from a 

 rabbit six weeks after birth. Zeiss D D, ocul. :. 



EXPLANATION OK PLATES IJ AND I*, <X 1 1 1. P . 618.) 



CoMi'i.r.rK l.i si- .->! UK 



ao. Aorta, cv. Cardinal vein. .(.-/. Glomerulus. c'V l'"' rst grixwe of head- 

 kidney. kidney, gr^ Third groove of head-kidney. 



