84 MALL. [Vor. XIX. 
No. 298 is from a tubal pregnancy regarding which there 
was much doubt until the remains of the ovum were found 
in serial sections. ‘The remnants of a very small ovum were 
found at the edge of the rupture of the tube. They are com- 
posed of fibrous villi partly invaded by leucocytes and sur- 
rounded by an irregular mass of syncytium, decidua and blood, 
I am inclined to believe that the case might have cured itself 
if it had not been treated by the surgeon. 
The second specimen (No. 278) is of the greatest signifi- 
cance in this discussion, for we have in it the whole ovum with 
its surrounding decidua, which appear normal, and changes 
within, which show that the embryo has been destroyed. The 
specimen was removed by a curette from a woman suffering 
with endometritis. Although no inflammatory changes were 
seen in the decidua and chorion, the condition of the uterus 
may have caused the destruction of the embryo. The ccelom 
is found filled with reticular magma, and this is permeated 
by a coarse network of mesodermal cells, which are continu- 
ous with and no doubt derived from those of the chorion. In 
one of the sections, lying free in the middle of the ccelom, there 
is a small clump of epithelial cells, about 100 in number, 
which may have been derived from the embryo. The chorion 
contains no blood-vessels and in general reminds one much 
of Peters’ ovum. . 
No. 71 has a history similar to No. 278, it being, however, 
a natural abortion from a woman suffering from endometritis. 
The exterior of the specimen is normal in appearance, and in 
sections the structure of the chorion and villi also appears to 
be so. Within the ccelom there is some reticular magma and 
a small mass, which would not stain, and appears like a mass 
of dried blood corpuscles. With this there is another speci- 
men (No. 204), without any history. Its chorion is again 
normal, both macroscopically and microscopically, is filled 
with a mass of granular magma, but contains no remnant of 
an embryo nor amnion. 
The remaining specimens of this group are all from tubal 
pregnancies and show no remarkable reactions. They are 
