362 DR FOULIS ON THE DEVELOPMENT OF THE OVA, ETC. 
is the forerunner of the tunica albuginea, This youngest connective tissue 
appears as a transparent jelly-like substance, and in it are numerous fusiform 
corpuscles or nuclei. Fine homogeneous points of this young tissue may be 
seen insinuating themselves among the corpuscles of the germ epithelium, and 
in some preparations of 6 and 74 months’ foetal ovaries in which the germ 
epithelial layer is partially detached such fine points of the jelly-like young 
tissue may be seen in considerable numbers. 
In many places immediately under the germ epithelium, small groups, 
consisting of a few germ epithelial corpuscles (fig. 21, 9,9,q), are found in 
the act of being surrounded by this same jelly-like tissue ; some of the groups 
are completely surrounded and separated from the germ epithelium layer, while 
others are partially surrounded, and are still in connection with the germ 
epithelium superiorly. The youngest connective tissue can always be traced 
in direct continuity with vascular bundles of tissue which completely sur- 
round the large groups of imbedded germ epithelial corpuscles, and is part of 
the general stroma of the ovary. This imbedding of germ epithelial corpuscles 
takes place under the germ epithelium all round the ovary. 
After being thus included in meshes of the stroma, the germ epithelial 
corpuscles increase in number and in size, and there results the formation of 
those large egg clusters which are found under the germ epithelium in all parts 
of the ovary. 
Each imbedded corpuscle undergoes the following change:—The nucleus 
enlarges, gradually becoming a spherical vesicular body, and the protoplasm 
which surrounds it is at the same time increased in quantity. As the result of 
the enlargement of each corpuscle in the group, the whole group as a cluster : 
expands and becomes more or less spherical. As these egg clusters expand, 
those lying immediately under the germ epithelium push the latter structure 
before them, and in this manner the surface of the young ovary is madeto 
present a very irregular appearance. Between the prominences or irregularities 
thus produced are depressions or furrows. These originate as simple depres- ¥ 
sions between two or more adjacent expanding egg clusters, and they become 
deepened by the growth and expansion of new egg clusters under the germ 
epithelium in connection with those already formed. 
In describing the appearance of a seven and a half months’ human feetal 
ovary in section, I stated that the germ epithelium passed round the ovary | 
from one lateral border to the other, dipping into and lining certain tube-like 
structures and tubiform depressions which appear to pass from the surface 
downwards into the organ. Now, if vertical sections are made through a young 
ovary such as above described, whose surface presents numerous irregularities, 
we have the appearance presented as if tube-like structures (fig. 22, p, p) 
passed down from the surface of the ovary into the substance of the organ, and 
..| 
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