352 MALL. [Vor. XIX. 
specimens, some of them having undergone marked degenera- 
tion. The villi are developed better on one side of the chorion 
than on the other, and here they contain structures which are 
undoubtedly blood-vessels. 
The syncitium is not very marked and is held together by a 
slimy mass which contains some leucocytes. The surround- 
ing tissue, the “decidua,” is full of fibrin and contains numer- 
ous fragmented nuclei and some blood. 
It is natural to read into thi specimen the following his- 
tory: The embryonic mass grew long enough to send its 
blood-vessels into the chorion and then the nutrition was cut 
off because the villi did not attach themselves properly. That 
this was the case is shown by the capsule of necrotic tissue 
‘which encircles the villi. As a result of impaired nutrition 
the embryo was destroyed, leaving only the isolated chorion 
filled with reticular magma. 
No. 369. 
Ovum, 7 <3 x3. 
Professor Brodel, Baltimore. 
The specimen was removed by operation from a tubal preg- 
nancy on October 9, 1906. The woman’s last period began 
September 17. The distended tube measured 25 mm. in 
diameter and when cut open a small lump, 2 mm. in diameter, 
was seen on one side of its cavity. This was believed to be 
the embryo, but serial sections proved it to be a small mass of 
blood very rich in leucocytes. 
The sections show the chorion pretty well folded upon it- 
self, which is torn at several points. The torn edges are well 
rounded, that is, they are healed and are therefore not due 
to the operation. Few villi are left, and they, with the main 
walls of the chorion, are very fibrous in structure. There is 
but little syncytium present. The entire chorion is sepa- 
rated from the wall of the tube by a thick layer of blood, and 
the tube wall is well infiltrated with leucocytes. What is most 
remarkable in this specimen is that the amnion lines the 
chorion completely and all of the mesoderm of the chorion is 
