184 MALL. [VoLt. XIX. 
Fic. 110.—Photograph of the embryo within the chorion. Natural size. 
The chorion is atrophic and the decidua is infiltrated with 
leucocytes. The amnion, umbilical vesicle and the attach- 
ment of the umbilical cord to the chorion are completely de- 
stroyed. The embryo is atrophic, the face not being developed 
at all. The central nervous system is swollen; the outlines 
of the viscera and body cavity obliterated and filled with 
migrating cells. The liver is small. The heart and large 
blood-vessels are greatly distended. 
No. 115. 
Ovum, 30 x 27 x 22 mm.; amnion, Io x 5 x § mm.; embryo, 
GOR.) 73 mm, 
Dr. A. S. Atkinson, Baltimore. 
The abortion took place two months after the beginning of 
the last period. During the second month of pregnancy there 
was continuous bleeding. 
The ovum was brought to the laboratory fresh immediately 
after the abortion and placed in strong formalin. It was 
opened at once in formalin and found filled with a gelatinous, 
transparent mass, which became fibrous after the formalin 
had acted upon it. Later on alcohol made it opaque. The 
chorion is practically free of villi and looks necrotic. The 
embryo is well in the middle of the ovum and is apparently 
separated from the chorion. The head as well as the tail is 
atrophic. 
Sections show that the villi of the chorion are atrophic, 
with but a small quantity of syncytium attached to them. The 
