4 
IN TREWIA. 19 
posite, they must approach each other more nearly by the 
ventral than by the dorsal suture. The instances of Com- 
posite and Gramineæ cited by Lindley, are instances of an 
apparent simple ovarium combined with a plurality of styles. 
n Composite this is proved by each having the ordinary 
structure, i. e. presenting the same evidence of composition, 
and in Graminez by the frequent presence of a rudimentary 
3rd style. 
If L. were right, no mesial line corresponding to the 
ventral suture will be visible, nor the stigmata of Composite. 
From the last passage, para. 2, p. 197, the size of the con- 
ducting tissue would appear to depend upon the amount 
of convolution or approximation of the carpels; is this the 
case ? : 
The term dorsal suture would appear to be incorrect, for it 
obviously points to a line of union existing in that direction. 
Stigmata being the continuation of the placentæ, must 
have the same relations as that, consequently no stigma can 
be really right and left of the placenta. All the cited ano- 
malies, Parnassia and Papaver, inexplicable by the Lindleyan 
hypotheses, are explicable by this. 
The composition of the ovarium is indicated by the num- 
ber of styles or of stigmata. Therefore, if Dr. Lindley wishes 
to prove his explanation of Punica to be correct, he will, 
as is evident from his figures of the same, concede that the 
component parts of the style or the number of stigmata must 
be equal to the number of carpels. 
Whereas the number of the component parts is almost in- 
finitely small, I believe not exceeding 5 or 6; and this num- 
ber will be found to be the number of the cells of the 
ovarium in its very young state. 
I make no account of obliteration, because the style or 
the stigmata are, so to say, the most permanent parts of a 
pistillum. 
As there are many gradations in amount of parietal pla- 
centation, in some incomplete inflections of the carpellary 
leaves taking place, in others the ovula are borne on the 
face of the carpella, but in situations corresponding to the 
* 
