A Study of the lollicular Epitlielium frorn the Ovary etc. (33a 
of the oöcyte where the formation of the secretion seemed to obscure 
or obliterate them, Gross (10). Preservation of the ovaries ofteu 
tends to shriuk the oöcyte so that in raany sections it is found to be, 
either along a part or all of its surface, removed a little frorn the 
free margin of the epitlielium, Mollison (20). Where this has taken 
place tliere is, in almost all cases, a series of Strands passing frorn 
the margin of the cells to the oöcyte (Fig. 12) ; these are very similar 
to the pseudopodia-like processes described by Mollison (20) for 
Melolontha vulgaris. These must not be confused with the processes 
several observers have noted as present on the epithelial cells during 
the formation of the chorion. Along this free margin of the epithe- 
lial cells is a very tliin granulär layer and it is frorn this that the 
Strands pass to the periphery of the oöcyte, some connecting the one 
part with the other and some extending a part of the distance as if 
the shrinkage of the oöcyte had split this layer into two parts, one 
part remaining on the periphery of the oöcyte and the other on the 
outer margin of the epitlielium. As just mentioned, within the cham- 
bers of the same size as this one we are describing, the contents of 
the oöcyte appears the same at all parts. At a little later stage yolk 
globales begin to appear, at first these are small but increase in size 
with the age of the oöcyte. The yolk globules are scattered throughout 
the oöcyte except a rather narrow peripheral layer. Next inside this 
layer. very many of the globules are found but are here small; it 
appears as if this was the area in which they are first formed. The 
peripheral layer is of course that part of the oöcyte which first re- 
ceives the secretion frorn the epithelial cells, and, just inside this 
outer layer, the yolk globules first make their appearance. 
A section through a follicle a little older than the last, shows 
the cells and their nuclei to be practically of the same structure as 
younger ones. Between the outer edge of the epithelial cells and 
their nuclei large vacuoles are present (Fig. 12) similar to those 
described in a younger stage (Fig. 10). In the basal region of the 
cells the cytoplasm does not show any vacuoles; the peripheral layer 
of the oöcyte is here made up of a finely granulär substance (Fig. 12, pl) 
which is, as in the last figure, pulled away in places from the sur- 
face of the epitlielium. The outer boundary of the epithelial cells 
is either very difficult to distinguish or it can not be made out at 
all, Brandt (4). In this chamber the outer layer of the oöcyte is 
striated the striae being rather faint and all running in the same 
direction, perpendicular to the surface of the oöcyte. In nearly all 
