No. 1.] ORIGIN OF HUMAN MONSTERS. 357 
The hardened tube is 40 mm. in length and 20 mm. in 
diameter. It was cut into blocks 5 mm. thick and imbedded 
in colloidin. Two of the blocks were found to contain the 
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Fic. 396.—Section of the chorion containing the embryonic mass. X 35 
times. E, remnant of the embryo; UV, umbilical vesicle. 
ovum and these were cut out and reimbedded in paraffin and 
cut into serial sections. The sections show that the ovum 
has unusually long villi, fully 5 mm. long, which ramify 
