80 
OVARIAN PREGNANCY 
went through the segmentation phases, and as an early blastocyst 
found itself within the contracting follicle just as normally the blastocyst 
finds itself, after its passage through the Fallopian tube, in the uterine 
cavity. It now behaved as a uterine ovum would have done. It 
attacked the wall of the follicle and imbedded itself in the vascular 
counective tissue immediately without the capsule. This sequence of 
events is indicated by the large size of the break in the wall of the corpus 
luteum, which is considerably larger than that found in the wall of a 
normal corpus luteum a few weeks after the escape of the ovum from 
the follicle, and also by the necrosed tissue in the lips of the opening. 
The fibrinous and partially necrotic mass in the mouth of the corpus 
luteum we take therefore to correspond to the fibrin cone in the aperture 
of entrance in the early uterine ovum, or the later cicatricial tissue known as 
Reichert’s scar. Having lodged itself in the narrow band of stroma between 
the corpus luteum and the surface, the further growth of the ovum has 
resulted in the extensive destruction of the ovary which is now visible. 
We have seen in the first paper that the ovum tends to produce in the 
first instance an implantation cavity of transversely elongated shape. Here 
there seems likewise to have been greater extension of the destructive 
changes in a lateral direction, and the ovarian stroma had yielded place to 
the growing blastqcyst rather than the corpus luteum ; this is probably 
due to the nature of this tissue. What the blastocyst requires is a vascular 
connective tissue, and this it must have found more readily in the stroma 
of the gland. 
