158 MALL. [Vov. XIX. 
borders. The mesoderm is hypertrophic. The inner layer 
is irregular, thick and thin, with a tubular branching process 
which extends to the stem of the vesicle. There are blood 
islands in the vesicle and stalk, and the vessels extend to the 
villi of the chorion. There are migrating cells in the tissue 
of the pedicle. 
The syncytial layer is very extensive, forming large buds 
upon the chorion as well as upon the villi. At points these 
buds coalesce to form islands, the centers of which are com- 
posed of necrotic mass filled with fragmented nuclei. 
No. 25. 
Chorion, 25 mm. in diameter, with a pedicle within 6 mm. 
long and 2 mm. in diameter. 
Dr. J. W. Lord, Baltimore. 
The ovum is covered entirely with long villi, and has a 
hemorrhage on one side of it. The pedicle within has all of 
the characteristics of the umbilical cord of an embryo five 
weeks old. There is no trace of an embryo, but there are a 
Fic. 25.—Section through the umbilical cord and amnion at their attach- 
ment to the chorion. X Io times. 
number of cells at the free end of the pedicle, which also has 
a ragged edge. The amnion lines the entire ccelom and is 
reflected over the pedicle just as it would be over the normal 
cord. 
Sections show that the club-shaped cylindrical body is in 
fact the cord with its blood-vessels and amnion. The free 
end of the cord is rich in round cells, appearing much like the 
granulation tissue of healing wounds. At this point the end 
