224 MALL. [ Vor. > Gi D,% 
jelly in formalin. The embryo is atrophic, with a necrotic 
mass on top of its head. 
The fleshy chorion proved when sectioned to be a mixture 
of true chorion, villi, blood, fibrin, decidua, blood sinuses, pus 
and syncytium. The layers are not at all in regular order, and 
show all stages of disintegration. The mesoderm of the villi 
is fibrous and is often invaded by leucocytes and syncytium. 
At other points the syncytium invades the blood clot and fre- 
quently maternal blood sinuses are filled with leucocytes and 
syncytium. 
HirGas2O nas 
Photograph of the embryo. Enlarged 2 diameters. 
Within the embryo most extensive changes have taken 
place. The brain is greatly deformed and is severed, through 
a growth of tissue, from the spinal cord in the region of the 
medulla back of the deformed ear. In fact, the brain is in- 
cluded within the cap-like body on top of the head. The 
spinal cord begins quite abruptly in the upper cervical region 
and ends in the same way in the upper lumbar region. At 
its end there is a curious fibrous tumor measuring’ half the 
diameter of the cord. The cord, so far as it is developed, 
appears to be normal, but it is dissociated somewhat. Below 
the upper lumbar region the spinal cord is wholly wanting, 
