88 MALL. [Vot. XIX. 
Nos. 280 and 223 follow in regular order No. 55. In the 
first the coelom is small, contains some reticular magma and 
the wall of the chorion is thin. The villi are not very large, 
are well developed, contain remnants of blood-vessels and are 
covered with a mass of necrotic syncytium. The whole spect- 
men is surrounded with mucus, blood and pus. Leucocytes 
have entered the mesoderm of many of the villi. The second 
specimen is a solid mass with its base broken off. Radiating 
from its base of attachment there are long villi, which en- 
circle mostly, and partly penetrate, the main mass of the 
tissues composed of blood and fibrin. Between the villi there 
is an active syncytium more or less necrotic, which gives the 
picture of a cancer. The whole is covered with a capsule of 
pus. 
The remaining specimens may be considered in two groups, 
solid moles and hydatiform moles. Belonging to the first 
group (No. 153) is a pear-shaped body composed of an 
inverted chorion imbedded in an organized blood clot, inter- 
mixed with villi and syncytium. There are also numerous 
leucocytes, which have invaded the mesoderm from its ccelom 
side. No. 290 is composed of decidua, mucous membrane of 
the uterus, blood, fibrin, pus and villi which are being destroyed 
by leucocytes. No. 233 is composed of an irregular mixture 
of villi, syncytium, decidua, blood and pus. Fresh blood is 
in the middle of the tissues, which, like most moles of this 
kind, are nourished through their centers. Its exterior is cov- 
ered with pus. 
To what extent a collapsed ovum may grow is shown in 
specimen No. 82. A large solid mass the size of a duck’s 
egg was expelled nine months after the last menstrual period. 
On the end which lay in the os uteri there is an extensive 
ulceration of the mole; otherwise it is very compact. After 
it had been hardened, I cut it into two parts, which, to my 
astonishment, contained within a collapsed chorion, sending 
its folds in all directions throughout the mole. In the mid- 
dle of the specimen there are large spaces along the col- 
lapsed chorion, filled with fresh blood. The opposite walls 
