No. 1.] ORIGIN OF HUMAN MONSTERS. 205 
ccelom is from two to three millimeters wide, and is filled with 
typical magma reticule. 
The structures of the embryo form almost a continuous 
mass of tissue, in which the irregular central nervous system 
Fic. 275a.—Photograph of the ovum. Natural size. 
Fic. 275b.—Photograph of sections of the ovum, showing the embryo in 
one of them. Natural size. 
can still be outlined. Enough is left to show that the speci- 
men began to become infiltrated towards the end of the third 
week. 
Most of the epidermis is still intact. The lenses of the 
eyes form small pearls enclosed in capsules lying beneath the 
