No. 1.] ORIGIN OF HUMAN MONSTERS. 103 
TABLE VII. 
ARRESTED DEVELOPMENT OF THE EMBRYO. 
(Third Week.) 
No. |Embryo. Chorion. areas Changes in the Chorion. 
mm. mm. days 
166 2.3 40 X 40 X 40 iB Tubal pregnancy. 
II5 2 BOR Exa2 56 | Atrophic. 
eeG ies | f§ Atrophic. 
9 3 nie: Tubal pregnancy: ' 
209 3 2a ES KILO | Atrophic. 
246 3 BO om Tl Hyaline. 
252 3 84 Hyaline. 
292a| 3.5 50 X 30 X 30 54 Fibrous. ™ 
Bi ge 45 X45 X22 Fibrous and atrophic. 
400 555 La 
189 4 28 X25 X15 
228 4 60X25 X25 79 Very fibrous. 
244 4 25X15 X15 
253 4 Zo 40 505 Hyaline. 
302 4 25 2050 16 Fibrous. 
309 4 23 X 20 X 20 
399 4 4or 5 wks 
402 4 40X%25xX20 |6or8wks 
328 a.5 Normal and covered with nec- 
rotic syncytium. 
No. 166, and in it the dissociation of the tissues is complete. 
This is not remarkable, for the menstrual history says that 
it is 71 days old, showing that the pathological process has 
been under way at least a month. The ovum has thick walls 
with a large cavity within lined entirely by the amnion, which 
is not attached to it at any point. There are no blood-vessels 
in the villi of the chorion. The embryo is cylindrical in form 
and is attached for half its length to the amnion and then 
perforates it. Its organs and tissues are almost completely 
dissociated, there being but the faintest outline of the nervous 
system in its center. In the tail end of the embryo there is a 
blind tube, which may represent the allantois. Within a sac 
on one side of the body, which communicates with the ccelom, 
there is a small mass representing either the heart or the 
umbilical vesicle. Greater changes could not have taken place 
without obliterating the anatomy of the specimen entirely. 
There are eight specimens (Nos. 115 to 400) of the second 
group in this series, that is, embryos which began to degen- 
