188 MALL. [VoL. XIX. 
No. 124. 
Ovum, go x 75 x 50 mm.; embryo, C. R., 35 mm. Abor- 
tion 18 weeks after the beginning of the last menstrual period. 
Dr. Cassidy, Baltimore. 
The ovum was brought to the laboratory fresh and then 
hardened in a strong solution of formalin. It appears as a 
transparent cyst with a crescent-shaped placenta on one end, 
measuring 60 x 50 mm. Upon opening it I found within a 
second sac measuring 50 x 37 x 35 mm., which had tough 
Fic. 124a—Whole ovum with placenta attached to one side of it. 
Reduced one-half. 
fibrous walls and proved to be the amnion. Within this was 
the embryo, with club hands and feet, pointed ears and a very 
thin, twisted, umbilical cord. 
Sections of the placenta show that the villi are matted 
together and are covered with a thick layer of decidua cells. 
The entire thickness of villi is infiltrated with leucocytes, 
which at points are accumulated sufficiently to form small 
Fic. 124b—Ovum cut open, showing amnion. Reduced one-half. 
