98 MALL. [Vor. XIX. 
What has been said about ova with neither embryos nor 
amnion applies equally well to those in which the amnion is 
not destroyed. In this group there are also all intermediate 
stages present, and they can be arranged in a series, if con- 
sidered alone, for if the embryo is present there is also an 
amnion, and adding them spoils the group. The group given 
in Table IV could, therefore, be scattered under the follow- 
ing headings, but this is not convenient, because the absence 
of the embryo makes it difficult to determine at what time the 
pathological changes in the embryo began, and, furthermore, 
it is easier to consider alone those specimens in which the 
amnion is present with more or less of the cord, including aa 
occasional fragment of the embryo. This group blended with 
embryos over four weeks old would compel us to subdivide 
those of each week as follows: 
(1) Normal embryos. 
(2) Atrophic embryos. 
(3) Remnants of atrophic embryos attached to the um- 
bilical cord. 
(4) Umbilical cords alone. 
(5) Ova lined with an amnion alone. 
(6) Moles with remnants of the amnion present. 
With this brief introduction, I shall proceed to consider 
pathological ova in which the development of the embryo is 
arrested, beginning with those of the second week. In my 
first Contribution there were none belonging to this list; in 
the second Contribution there was one. I now have three 
new ones (including No. 12) to add. 
TABLE, WV: 
ARRESTED DEVELOPMENT OF THE Emsryo. (Second Week.) 
No. | Embryo. | Chorion. oe ont Changes in the Chorion. 
mm, mm. days 
162 x 70% 30 X 30 81 Atrophy. 
250 op IoXQ9xX9Q Leucocytic infiltration of 
decidua, chorion normal. 
321 oN 40 X 40 X 20 
12 2.1 20 X 20 41 Small amount of mucoid mass 
Nor- between villi. 
mal(?) 
