216 MALL. [ Vo. XIX. 
the larger arteries and veins. In general the tissues show the 
changes always seen in embryos which have been gradually 
strangulated before the abortion. 
In this specimen there is one marked variation in the 
changes usually found. The precartilage outlines all of the 
vertebrae and ribs, but no true cartilage is as yet formed in 
them. Back of the eyes in the occipital region there are on 
either side of the head two cartilages well developed, much too 
advanced for embryos of this stage. A more advanced stage 
of this cartilage will be found in embryo No. 135. The head 
is also beginning to become stumpy; the frontal process 1s 
necrotic and is beginning to fall off. 
No. 180. 
Ovum, 20 x I5 x Io mm.; vesicle, 2 mm. 
Dr. CW: Dodges Rochester (Nay: 
“TI have in my possession a human embryo which, if I may 
judge from some of your papers which I have seen, is likely 
to be more valuable to you than to me, and for this reason 
I have kept it intact, instead of sectioning it as I have been 
sorely tempted to do. Its history is as follows: The woman 
from whom it came is a patient of Dr. Edward Mott Moore, 
Jr., of this city. On March 28, last, her right ovary was re- 
moved. She left the hospital on April 15, and coitus occurred 
May 13. On June 19 menstruation appeared and this ovum 
was expelled, which was brought to me in a pill box (the 
membranes being broken in handling), and put at once into 
4 per cent formalin, in which solution it still remains. As 
the dates given above are vouched for by the patient and the 
physician, it seems to me that we have here an unusually 
accurate and perfect history of the embryo, and, while it is 
not so very young, its history may give it additional interest.” 
Sections of the chorion show that its mesoderm is of nor- 
mal thickness, but is fibrous and rich in nuclei. Throughout 
the main wall of the chorion, but not in its villi, there are 
numerous blood-vessels filled with blood, showing that at one 
time an embryo may have existed. 
