Here the same mistakes have been made as in the above-
mentioned cases.
If we are able to prove embryologically a possibility that
displaced cells, carried into or near to the ovary, are the canse



Fm. SB.— Prominence on the Inner surface or a dermoid erst ol the i
Separated from the lung (a) by a membrane (b) adherent to the pleura. C. normal cutis
With hair; B, sebaceous glands; p, tsV,j tissue; Q, hyaline cartilage; B, canal with
ciliated •pftteHum; I, nenes.
of these tumors, we will then have an explanation which is in
harmony with the explanations given for the above-mentioned
cases. That this is, beyond any doubt, the case as regards
ovarian dermoids, the following work will prove. In addition
we shall explain at the same time the origin of most of the
other ovarian tumors, cystic or solid.
At any rate, the dermoid cysts of the ovary form no specific
group. We find on the inner surface of these cysts a promi-
nence whose base is formed by the tissue of the ovary. In
this prominence are found sebaceous glands (a, Fig. 21), hair,



53 BANDLffiR: DERMOID AND OTHBB CYSTS OF THE OYABY.
curtilage, bone (g), glands lined with squamous epithelium,
with cylinder epithelium, with ciliated epithelium; also teeth
(h), glia tissue (/), lymph -adenoid tissue, etc., as may be seen
in Fig. 21 from Wilms.
The same prominence occurs in other dermoids, as Fig. 22,
from Wilms, a prominence in a mediastinal dermoid, proves.
