212 MALL. [Vou. XIX. 
The sections prove the mass to be an embryo of the fifth 
week, filled and covered with round cells. These cells have 
obliterated the structure of the head entirely, but as the tail 
end of the body is approached the outline of the organs can 
still be defined. The villi of the chorion are developed in a 
great mass of blood and pus; the syncytium is excessive. 
Within the stroma of the villi there are, at many points, many“ 
round cells which appear to be migrating cells from the 
embryo. 
No. 162. 
Mole, 70 x 30 xX 30 mm.; embryo, I mm. 
Dr. Wanstall, Baltimore. 
The specimen came to me in formalin with the following 
note from Dr. Wanstall: “Last period from September 2 to 
7, that is her usual time, five days. The woman began bleed- 
ing November 9, and passed the specimen on November 22. 
She is the mother of five children and says that this is the 
. ° . ad 
Fic. 162—Section through the embryo. 15 times. Ch, chorion; am, 
amnion; h, heart; wmb, umbilical vesicle; 7m, intestine; all, allantois 
or possibly liver. 
only time-she has aborted. There is not the slightest indica- 
tion of uterine disease.”’ 
Within the specimen there is a cavity measuring 35 x 12 x 
12 mm., lined with a smooth wall and filled with a jelly-like 
substance, within which there is a very small embryo which 
was cut into serial sections 50 microns thick. The sections 
show a remarkable atrophy of the embryo and umbilical 
vesicle. The chorion is very thin and is composed of meso- 
