90 
OVARIAN PREGNANCY 
cannot be admitted as a decisive proof of that contention. When we 
consider, however, the nature of the processes involved in the implantation 
of the blastocyst, more especially in the early stage revealed by our 
uterine ovum, it may safely be affirmed that, if further proof were needed, 
the results of our investigations establish beyond all doubt that the plas- 
modium is in the human subject a product of the foetal ectoderm. 
