_do._ Developing ovum. _fc._ Cells which will form the follicular
epithelium, _fe._ Follicular epithelium. _ge._ Germinal epithelium. _mg._
Malpighian body. _n._ Nest of cells of the germinal epithelium. _nd._
Nuclei in the act of dividing. _o._ Permanent ovum. _ov._ Ovary. _po._
Primitive ovum. _t._ Tubuliferous tissue, derived from Malpighian bodies.
Fig. 35. Transverse section through the ovary of an embryo rabbit of
eighteen days, hardened in osmic acid. The colours employed are intended to
render clear the distinction between the germinal epithelium (_ge._) and
the tubuliferous tissue (_t._), which has grown in from the Wolffian body,
and which gives rise in the male to parts of the tubuli seminiferi. Zeiss
A, ocul. 2.
Fig. 35A. Transverse section through a small part of the ovary of an
embryo from the same female as fig. 35, hardened in picric acid, shewing
the relation of the germinal epithelium to the subjacent tissue. Zeiss D D,
ocul. 2.
Fig. 35B. Longitudinal section through part of the Wolffian body and the
anterior end of the ovary of an eighteen days' embryo, to shew the
derivation of tubuliferous tissue (_t._) 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
twenty-two days, hardened in osmic acid. It is coloured in the same manner
as fig. 35. Zeiss A, ocul. 2.
Fig. 36A. 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 37A. The same parts of an ovary of a twenty-eight days' embryo
as figs. 36 and 36A 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. 38A. Vertical section through a small part of the surface of the same
ovary as fig. 38. Zeiss D D, ocul. 2.
Fig. 38B. 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. 2.
Fig. 39A. 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. 39B. Section through a small part of the innermost layer of the
germinal epithelium of a rabbit seven days after birth, shewing the
formation of Graafian follicles. Zeiss D D, ocul. 2.
Figs. 40A and 40B. Small portions of the middle region of the germinal
epithelium of a rabbit four weeks after birth. Zeiss D D, ocul. 2.
Fig. 41. Graafian follicle with two ova, about to divide into two
follicles, from a rabbit six weeks after birth. Zeiss D D, ocul. 2.