
IN MAN AND OTHER MAMMALIA. 361 
recognise the germ epithelium by the fact that immediately below it all round 
the ovary are clusters or groups of corpuscles contained in meshes of the 
ovarian stroma, but under the peritoneal epithelium covering the stalk no such 
groups are found. 
It is worthy of remark, however, that sometimes under those epithelial 
corpuscles, which, as it were, form a connecting link between peritoneal and 
germ epithelial corpuscles, we find small groups of round corpuscles apparently 
consisting of abortive ova. It is only under and in connection with the true 
germ epithelium that groups of true primordial ova are formed. 
(c.) The manner of Inclusion of the Primordial Ova and Germ Epithelial Cor- 
puscles in the Stroma of the Ovary.—In a section of the ovary of a human foetus 
of 34 months, one sees large strings of connective tissue corpuscles (fig. 19, 
j,J,J) growing upwards in a radiating manner from the deeper parts of the ovary 
toward the germ epithelium (,/.) These strings or bundles communicate 
with each other and form meshes, and in these meshes are round groups of 
corpuscles (0,0,0) which resemble very closely the corpuscles of the germ 
_ epithelium (/,) which invests the ovary. Immediately under the germ epithe- 
lium such groups of corpuscles may be seen partially imbedded in meshes of 
the stroma. In the deeper parts of the ovary we find large primordial ova 
(fig. 20, m,m) lying separate from each other, and in contact with the protoplasm 
which surrounds the germinal vesicle of each are small connective tissue cor- 
puscles (, 2) exactly similar to those which make up the strings or bundles of 
young tissue in other parts of the ovary. These little connective tissue corpuscles 
are quite different in appearance from the corpuscles of the germ epithelium 
on the surface of this young ovary, or those imbedded in groups in the stroma. 
The stroma of the human foetal ovary of 74 months consists almost entirely 
of fusiform connective tissue corpuscles, and in a section of such an ovary we 
find the whole stroma arranged in the form of a mesh-work, in the meshes of 
which are large and small groups of corpuscles, just as we described in the 
_ case of the ovary of the calf, the kitten, and human foetal ovary of 34 months. 
In the bundles of connective tissue corpuscles which (as seen in section) lie 
between the groups of corpuscles we find blood-vessels, and on close ex- 
amination it is seen that the walls of such blood-vessels consist of connective 
tissue corpuscles. Wherever the bundles of connective tissue proceed, in the 
midst of them are blood-vessels. On tracing the bundles of vascular tissue 
upwards, we find they arch round large and small groups of corpuscles im- 
mediately under the germ epithelium, and completely inclose them in meshes. 
In some situations under the epithelium the connective tissue bundles have 
not yet grown round the groups of corpuscles, but may be traced up as far as 
the germ epithelial corpuscles on either side of the groups. Under the germ 
epithelial layer the youngest connective tissue is found, and in this situation it 
VOL. XXVII. PART III. 5B 
