No. 1.] ORIGIN OF HUMAN MONSTERS. 275 
No. 285. 
Ovum, 45 x 35 X 35 mm.; embryo, 8 mm. 
Dr. Keown, Baltimore. 
“Tast menstruation October 9 to 12; abortion December 
20, 1904. The specimen came away unbroken, was washed in 
water and placed in alcohol. There is reason to believe that 
conception did not take place until the time for the period 
which lapsed. The mother insists that this is the case, and, 
‘nasmuch as all three of her children had diphtheria at that 
time it is probably true.” 
The chorion is mostly bare, with some hemorrhage in its 
walls. The villi which are left are very fibrous, with but few 
blood-vessels within them. The syncytium over them is very 
active, and at numerous points it is heaped up in small] 
mounds, which form depressions, making it appear as if they 
Fic. 285a.—Photograph of the embryo and chorion. Natural size. 
are about to invade the mesoderm of the villi as well as that 
of the main wall of the chorion. The amnion fills the entire 
chorion. 
Between the villi there is a reticular arrangement of blood 
and mucus, in which there are numerous leucocytes. The syn- 
cytial bodies enter this reticular mass at numerous points and 
make a very remarkable picture. 
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