156 Mr. D. Dow on the Origin and Nature 
edges is occupied by a fascicle of vessels: the two parallel ones, 
which are also generally the most prominent, develop them- 
selves into the ligulate appendage ; and the third, which occu- 
pies the facial edge, terminates abruptly in the sinus. There are 
other vessels which occupy the space between the three prin- 
cipal trunks. These circumstances taken together, have induced 
me to regard the corolla as wanting in the rays of Zinnia. 
My own observations tend fully to confirm the interesting 
hypothesis advanced by Mr. Brown respecting the compound 
nature of the pistillum in Composite. In Zinnia verticillata and 
multiflora the branches of the style, especially of such flowers as 
have an increased number, only partially cohere together, are 
readily separable, and may be traced from the apex of the 
stigmata to their connexion with the two filiform cords to which 
the embryo is attached, and which Mr. Brown* regards as a 
species of placenta. These cords, which are particularly distinct 
in Zinnia, are slightly thickened at their extremity, and bear a 
striking analogy to the slender bases of the filaments, which are 
generally found adherent to the tube of the corolla, as the former 
are to the sides of the ovarium. ‘The embryo is attached to the 
inner edge of the extremities of these cords, one of which I have 
Bese found not adhering to the sete of the ovarium, but 
ssing dow n its c. tre quite free. In some cases the branches 
sty ëi are found wholly Bona , so that t 1ey resemble so many 
distinct Eyle: and they may not unaptly e compared. to tho; 
of Umbellifere and. Araliacee. The embryo of Zinnia is easily 
extracted from the ovarium entire suspended between the two 
placental cords, and surmounted by the style and stigmata ; and 
there poppears to be no interruption between the branches of 
the style - and these cords, it occurred to me as ae that dvo 
would prove on! ya continuation of that. organ. E 
-n Ei: rami SOC ai: p. 89. 
=F he 
