218 MALL. [ Vor. XIX. 
marcation being obliterated. The large veins of the body are 
gorged with blood which also extends into the surrounding 
mesoderm. On the frontal side of the head there is a straw- 
Fic. 182.—Piece of head showing necrotic mass over the mid-brain. 
Enlarged 2 diameters. 
colored necrotic mass with some migrating cells within it. On 
the dorsal side of the head the mesoderm is thin and blistered, 
indicating the beginning of spina bifida. The cartilages alone 
are still well defined. 
No. 185. 
Ovum, 40 x 25 %.15 mtn: 
Dr. Sabin, Baltimore. 
The abortion occurred seven weeks after the beginning of 
the last period. The specimen was brought to me in formalin, 
and upon opening it I found that the ccelom was stuffed with 
reticular and granular magma. No trace of an embryo could 
be found, although the entire ovum was cut into serial sections. 
The main wall of the chorion is completely filled with leu- 
cocytes from the mother and show all stages of fragmentation 
of the nuclei. They form a fairly sharp border on the ccelom 
side, making the chorion appear as the wall of an abscess. 
The invasion of the chorion with leucocytés must have been 
merely from the coelom side, as the villi are not invaded to 
any extent. Some of the villi are cedematous, others atro- 
phied, being covered with a normal amount of syncytial cells. 
No. 188. 
Ovum, 45 x 40:x.40umm, Fembryo,.C€ 7 17 aim. 
Dr. G. N. Sommer, Trenton, N. J. 
“Last menstruation began January 6; bleeding began 
March 19, and ended in a few hours with the abortion. The 
