No. 1.] ORIGIN OF HUMAN MONSTERS. 161 
Upon opening the ovum I found within it a large pedicle, 
g xX 2 mm., which had every appearance of the normal um- 
bilical cord.of an embryo, 25 mm. long. The age of this 
ovum when estimated by the menstrual history calls for a 
cord of this size, but the chorion is undersized. At any rate, 
we have a cord without an embryo. At the point at which 
the cord should be attached to the body there is a mass of 
- cells, making it appear as if the embryo ulcerated away. At 
this point the blood-vessels are greatly distended with em- 
bryo’s blood, which also permeates the surrounding tissues. 
Within the cord there is a large space, the ccelom, as well 
as a reticular space, as is shown in Figs 32a and b. The 
mesoderm of the chorion and villi is fibrous. 
No. 37. 
Chorion, 25 x 18 x 15 mm., within a small nodule 2 mim. 
in diameter. 
From Dr. G. M. Gould, Philadelphia. 
The entire ovum is covered with villi which appear normal 
in form, both to the naked eye and under the microscope. 
The specimen was macerated considerably, but the thick 
sections I made of it are extremely instructive. The em- 
bryonic mass within proved to be an atrophic cord, embryo 
Fic. 37a.—Photograph of the entire ovum. Natural size. 
and umbilical vesicle, as shown in Figs. 37b, c and d. The 
cord with its blood-vessels passes directly over into the head 
end of the embryo, which contains but a rudimentary nervous 
