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Proceedings of the Royal Society 
corpuscles, whereby the latter become more and more embedded in 
the stroma of the ovary. G-erm epithelial corpuscles are being 
constantly produced on the surface of the ovary, to take the place 
of those already embedded in the stroma. The embedded cor- 
puscles increase in number by division, and the nucleus of each 
swells up into a spherical germinal vesicle, around which is gradu- 
ally produced the yelk of the ovum. In all parts of the young 
ovary under the germ epithelium, groups of germ epithelial cor- 
puscles become embedded in meshes of the stroma. As each indi- 
vidual in the group swells up the nucleus or germinal vesicle of 
each becomes very distinct as a round or spherical body. From 
the swelling out of each germ epithelial corpuscle in the group, the 
whole group expands and becomes more or less spherical. Such 
groups of developing corpuscles are called egg clusters. Each egg 
cluster is enclosed in a mesh or capsule of vascular stroma of the 
ovary. 
The stroma of the young ovary consists for the most part of 
fusiform connective tissue corpuscles and blood-vessels. The walls 
of the young blood-vessels in the young stroma consist of connec- 
tive tissue corpuscles. These connective tissue corpuscles are direct 
offshoots from the ovarian stroma, and are found in contact with 
the yelk or protoplasm of each primordial ovum situated among 
the germ epithelial corpuscles on the surface of the ovary. Wher- 
ever we find primordial ova we see connective tissue corpuscles 
in contact with the yelk of each. In all parts of the ovary we 
find the nuclei of connective tissue corpuscles dividing. Some- 
times these corpuscles are swollen out into round bodies containing 
three to four nuclei. In each egg cluster several of the included 
germ epithelial corpuscles are in a much farther advanced stage of 
development than their fellow's. From the walls of the meshes en- 
closing the egg clusters, delicate processes of vascular connective 
tissue grow in, between, and around individual corpuscles in the 
egg clusters, and by a continued intergrowth of the young stroma in 
this manner each individual of the group becomes at last enclosed 
in a separate mesh or capsule. These last formed meshes are the 
G-raafian follicles. 
As a rule, each G-raafian follicle is occupied by one young ovum. 
The protoplasm or yelk of each ovum is in close contact with the 
