134 DEVELOPMENT OF THE OVULUM 
The former can only take place in unsexual flowers, 
consult Aldrovanda, and Dutrochet, Recherches. Mem 
du Muse tom. viii. and Brown,— Ann. des Sciences, tom. viit. 
p. 211. 
Brongniart agrees entirely with Brown, so far as Mr. 
Brown goes. 
Mr. Lindley has adopted the views of M. Mirbel, but if 
mine be correct, the 4 last aphonisms in his excellent little 
Key to Structural and Physiological Botany, will require 
some alteration. 
The book of M. Brongniart, is worthy of the distinction 
bestowed on it by the illustrious Academy. And had the 
author divested himself of the theory therein adopted, and 
which was perhaps pre-conceived, it would have ranked 
among the very first productions. From its appearance we 
may date the possession of a correct knowledge of the struc- 
ture of the style, and stigma; the communication by a par- 
ticular tissue between this body and the placenta, and in many 
cases with the ovula; and that fecundation is not effected 
through the medium of any portion of the vascular tissue of 
the style. 
The determination of the absolute cellularity of the filets 
conducteurs, and their total distinction from the nourishing 
vessels. 
See his Memoire p. 58 for some excellent observations. 
It is but justice however to M. St. Hilaire, who is said by 
B. to be of opinion, that the filets conducteurs are vascular, 
to remember that this excellent Botanist distinctly states, 
that these filets are occasionally cellular as in Cuphea. It 
would still however appear, that M. St. Hilaire thinks this is 
only an exception to a general rule; See Archives, vol. ii. 
p. 390. 
To M. Brongniart we owe the general establishment of 
the fact of the emission of boyaux, their being derived from 
the inner membrane of the pollen, and of their passage into 
and beyond the stigma. But he seems to have lost sight of 
their ultimate destination as represented by Amici, and hence 
his theory. 
