No. 1.] ORIGIN OF HUMAN MONSTERS. 247 
the injury took place before the abortion. The general shape 
of the embryo and its degree of development are practically 
normal. The heart is well formed and it, with the blood- 
vessels, is filled with blood. The alimentary canal, brain, 
spinal cord, otic and eye vesicles, myotomes and branchial 
arches are much like embryo No. 12, which is practically a 
normal embryo of the beginning of the second week. The 
septum transversum is well marked and the thyroid gland is 
just beginning. 
Fic. 250a.—Ovum, opened to show the embryonic mass, within the 
decidua. about 2 diameters. 
Fic. 250b.—Section of embryo, encircled with magma, within the chorion. 
The amnion is torn. XX 17 diameters. 
