194 MALL. [Vor. XIX. 
urements are 10 x 4 mm., into which extends the umbilical 
cord. At the end of the cord there is a mass of tissue mostly 
broken down, the remains of the embryo. This mass is 
ragged, without any form corresponding to an embryo, and 
had the amnion been torn no doubt it would have fallen out. 
The blood-vessels of the cord are gorged with nucleated blood 
cells, but they do not extend into the embryo. The chorion is 
normal in appearance. 
The umbilical vesicle (Fig. 130a) is pear-shaped and com- 
pletely closed. At no place is there a break to show its at- 
tachment to the cord. Although considerably macerated, the 
sections showed the characteristic structure of an umbilical 
vesicle. 
No. 132. 
Ovum, 42 x 30 mm.; embryo, C. R., 15 mm. 
Dr. Munson, Washington. 
This specimen was kindly sent me by Dr. Lamb, who had 
obtained it from Dr. Munson. The woman from whom it 
was obtained menstruated last between August 15 and 20, 
and aborted November 12. The embryo was preserved in a 
50 per cent mixture of commercial formalin. The chorion is 
Fic. 132.—Photograph of the embryo. Natural size. 
atrophic with but few villi. The embryo has a stub head and 
the extremities on the right side are atrophic, while those on 
the left appear to be normal. 
The organs of the embryo are about normal in form and 
structure. The cord and brain are slightly dissociated. There 
is a small number of migrating cells in the tissues of the 
body as well as within the peritoneal cavity. 
