330 MALL. [Vor. XIX. 
to the chorion. These dilatations show the usual mucoid 
changes, with cavity formation. The embryos are disso- 
ciated and macerated. ‘The large blood-vessels are filled with 
blood, and it appears as if the migrating cells had infiltrated 
much of the tissues. 
No. 342. 
Ovum, 30 x 20 x 20 mm.; pedicle within, 5 x I mm. 
Professor Minot. 
The specimen is from a tubal pregnancy and has a very 
thin fibrous chorion, with traces of blood-vessels, and is prac- 
tically without villi. Within there is a thickened fibrous 
Fic. 342—Chorion, amnion, cord and remnant of the embryo. X I5 
times. 
amnion, to which the process, the umbilical cord, is attached. 
The cord is also fibrous, contains remnants of its blood-ves- 
sels and has attached at its free end a curious group of round 
cells, which probably represents what remains of the embryo. 
No. 343. 
Ovum, 55 x 45 x 35 mm.; embryo, II mm. 
Professor Minot. 
The chorion is of unequal thickness and mostly smooth. 
Sections show that not only is the decidua attached to it, but 
also portions of the uterus. The decidua is necrotic and infil- 
trated with numerous leucocytes. Below the decidua there 
