CHAP. II. 
OVARY. 
173 
L-l 
/ 
^ "^^ ^ if «, ^ in fig. 128. represents the 
side of one carpel and c, c? that 
of another, the dissepiment «, c, 
^5 d formed by this union will 
have precisely the same direction 
as that of the carpels, and can 
never acquire any other ; and 
the same would be true of the 
sides e,/and ^, A, if they formed themselves into dissepiments 
by uniting with other carpels : consequently a partition in any 
cell in the direction of z, h could not be a dissepiment, but 
would be of a different nature. 
2. They are uniformly equal in number 
to the carpels out of which the pistillum is 
formed, — Suppose the triangle A, B, C 
represented a transverse section of an 
ovary formed by the union of three car- 
pels 0, 0, 0 ; then d, e, f would be the 
dissepiments, and could not be either 
more or less in number. 
3. They proceed directly from the pla- 
centae. — As the placenta is the margin 
of the carpellary leaf, and as the dissepiment is the side of the 
carpellary leaf, it is evident that a dissepiment cannot exist 
apart from the placenta. Hence, when any partition exists in 
an ovary and is not connected with the placenta, it follows 
that such a partition is not a dissepiment, however much it 
may otherwise resemble one. 
4. They are alternate with placentae^ formed by the cohesion 
15 of the margins of the same carpel, and op- 
posite to placeatce, formed by the cohesion 
of the contiguous margins of different car- 
pels. — Let the triangle A, B, C repre- 
sent a transverse section of a three-celled 
ovary of which d, e, f are the dissepi- 
ments: the dissepiments d and e will 
alternate with the placentae m, g, both 
belonging to the carpel A ; but the dis- 
