No. 1.] ORIGIN OF HUMAN MONSTERS. 
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Fic. 325a.—Photograph of the whole ovum. Natural size. 
bryo. Here it contains large mesodermal spaces, which at 
points are infiltrated with round cells. The umbilical vesicle 
is present only in outline. Its lumen is partly filled with 
debris. However, some beautiful multipolar mesoderm cells 
may be seen. 
Fic. 325b—Body of the embryo within the ovum. Natural size. There 
is a large amount of magma within the ccelom, and the lump of it 
overhanging the cut edge of the chorion contains the umbilical vesicle. 
