CHAP. II. 
OVARY. 
205 
/ 
128 of another, the dissepiment a c 
^ ^ ^ h 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 f and g h, if they formed 
themselves into dissepiments by 
uniting with other carpels : consequently a partition in any 
cell in the direction of i k 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 , o; then e^f would be the 
dissepiments, and could not be either 
more or less in number. 
3. They proceed directly from the pla- 
C centa, when that part originates in the 
margin of the carpel. — 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 in such a case a dissepiment 
cannot exist apart from the placenta. Hence, when any par- 
tition exists in an ovary and is not connected with the placenta, 
if marginal, it follows that such a partition is not a dissepiment, 
however much it may otherwise resemble one. 
4. They are alternate with placentce formed by the cohesion 
130 of the margins of the same carpel, and op- 
^ ^ posite to placentce formed by the cohesion 
/ of the contiguous margins of different car- 
I / pels. — Let the triangle a b c represent 
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- 
sepiment d will be opposite the placentae 
