No. 1.] ORIGIN OF HUMAN MONSTERS. 319 
nervous system is dilated and is converted into a mass of 
round cells lying in the mesoderm without any epithelia 
lining; the otic and optic vesicles are likewise filled with 
round cells. The larger vessels are filled with blood, and the 
tissues are fairly well infiltrated with round cells. The epi- 
dermis is intact. Dissociation of the tissues has taken place 
to such a degree that it is difficult to outline all of the organs 
with certainty. 
The 
The walls of the umbilical vesicle are rich 
in blood-vessels, which communicate directly with those of the chorion. 
328b.—Section of the chorion and adjacent umbilical vesicle. 
chorion is hemorrhagic. 
Fic. 
