64 DR. LETHEBY ON THE EXTRUSION OF OVULES DURING MENSTRUATION. 
outer and lower part it also exhibits a purple spot, in which there 
is an aperture from which the ovule has escaped. 
(b.) The same ovary divided longitudinally through the cicatrix and spot, 
by which means two false corpora lutea, and the ruptured Graafian 
vesicle were brought into view. 
Fig. 8. Apart of the shaggy surface of the ovule, magnified 200 times, showing the 
arrangement of the nucleated cells which compose it. 
Fig. 9. The ovule crushed between glass and magnified 100 times: exhibiting the 
cellular envelope {a) ; the transparent zona pellucida {b) ; the yelk (c) ; 
and the germinal vesicle {d). 
Fig. 10. The same, after having been treated with acetic acid and then with ether; 
magnified 300 times. 
Fig. 11 . ^ portion of the Graafian follicle from which the ovule has just escaped, 
magnified 200 times : {a) a clot containing blood-discs, fibrin and large 
nucleated cells ; (&) some of the cells disengaged. 
Fig. 12. A portion of a corpus luteum, magnified 200 times; consisting of small fat- 
globules (a a) ; large nucleated cells containing fat-globules {bb) ; (c c) a 
part of the tissue showing a structure composed of fusiform or fibrous cells ; 
and {dd') large fat-globules formed by the aggregation of smaller ones ; at 
ff they have assumed other forms, in consequence of their having been 
pressed between the glass. 
