No. 1.] ORIGIN OF HUMAN MONSTERS. 301 
Fic. 310d.—Section of a villus. < 250 times. S, syncytium. 
some of the villi. The villi are vacuolated, contain some 
blood-vessels, and are covered with a fairly active syncytium. 
Over this there is a mass of mucoid fibrin rich in leucocytes. 
The interior of the ovum is filled with magma reticulé, and 
contains no trace of an embryo nor amnion. 
No. 311. 
Ovum, 36 x 30 x 30 mm.; embryo, Gakero 5 mati: 
Dr. Watson, Baltimore. 
The walls of the chorion are thin and covered with a few 
scattered and irregular villi. Sections show them to be in 
all stages of degeneration, the large ones with blood-vessels 
and a rich syncytium, and the small ones, which are fibrous, 
devoid of syncytium and infiltrated with leucocytes. The 
spaces between the villi have a considerable amount of blood 
between them, and where this comes in contact with an active 
syncytium the nuclei of the leucocytes are fragmented; else- 
where they are not. Portions of the main wall of the chorion 
are very thin, fibrous and devoid of an epithelial covering. 
Throughout the amnion is in contact with the chorion and is 
often blended with it. . 
Within the amniotic cavity there 1s a mass of granular 
magma which could be seen through the thin walls of the 
chorion before it was opened. 
