204 MALL. [Vot. XIX. 
The great quantity of magma reticulé within the ccelom has 
numerous migrating cells scattered through it. 
The amnion is partly in contact with the chorion and at the 
points of contact is normal in appearance. Where it is sepa- 
rated from the chorion by the excessive quantity of magma 
the walls of the amnion are greatly hypertrophied. The um- 
bilical vesicle is collapsed and its walls have undergone hyaline 
degeneration completely. 
The central nervous system of the embryo is greatly dilated 
and dissociated. The body cavity can barely be outlined. The 
large blood-vessels are faintly marked by the blood within 
them. The rest of the tissues are one homogeneous mass of 
tissue cells infiltrated with round cells, within which can still 
be recognized cartilages and nerve bundles. The boundaries 
of the heart and liver are wholly obliterated, due to their dis- 
sociation. 
No. 142. 
Ovum, 50 x 40 x 30 mm.; embryo, C. R., 15 mm. 
Dr. Sommer, Trenton, N. J. 
“Last period began September 28, 1898. On January 3 
there were marked uterine pains; free hemorrhage February 
1, and abortion February 4.” 
The chorion is fleshy, with some villi. Within there is a 
macerated embryo about five weeks old imbedded in a mass of 
fibrin-like magma. Between the magma and walls of the 
chorion there is a large space filled with clear fluid. 
Serial sections of the embryo and chorion show most re- 
markable changes. The chorion and amnion are greatly thick- 
ened, are very fibrous and look in every respect like the mem- 
branes in fleshy moles (No. 82, for instance). The villi are 
matted together by a mixture of blood, fibrin and numerous 
necrotic as well as living cells. The fibrinous mass within the 
amnion is in all probability blood which has entered from the 
exterior. It has all the appearance of blood clots found else- 
where in the body, but in addition it has been invaded by wan- 
dering cells from the embryo. The ccelom is partly filled 
