$4 Sir Everard Home on corpora iutea . 
fringed with small portions of the substance of the corpus 
luteum ; this has been usually taken for a perfect corpus 
luteum, and preserved as such. 
The cells met with in the ovaria before puberty are glo- 
bular ; but as the ovaria increase in size, the sides of these 
cells become squeezed, which gives them an oval form. 
[[Plate VI. fig. 4. and Plate VII. fig. 2 and 3.J 
EXPLANATION OF THE PLATES. 
Plate III. 
In this Plate are represented six figures of the human ova- 
rium in a virgin state, and one of the human ovum before it is 
impregnated. The external appearances of the ovaria are of 
the natural size. The internal appearances are magnified 
two diameters, the ovum itself is magnified twenty-two di- 
ameters. 
Fig. 1. the human ovarium at twelve years of age, show- 
ing its external form. 
Fig. 2. An internal view of the same: the blood vessels 
are injected, its structure is more compact than natural, the 
parts having been preserved in spirit. The cavities contained 
coagulated lymph and a serous fluid. 
Fig. 3. The external view of the ovarium at 20 years of 
age, after having been some days in spirit. 
Fig. 4. An internal view of the same, showing that al- 
though the woman was a virgin, there was a corpus luteum 
arrived at its full growth containing an ovum, which has two 
membranous coverings, the amnion and chorion; the ca- 
vity surrounding the ovum was filled with blood ; and the 
