184 DEVELOPMENT OF THE OVULUM 
always form the most obvious termination of the vascular 
cord itself. 
Thus, in several instances, the obvious termination of the 
vessels is at or near the foramen, as in many Composite, 
and Marlea. In others, it becomes ramified near the base of 
the seed, or chalaza, the ramifications tending towards the 
foramen. 
In some, the place of vessels is supplied by a membranous 
tube, of this Sphzrocarya is a notable instance. 
The vascular cord forming part of the raphe, consists of 
spiral nee and ducts, or of ducts alone, as in Cucurbita- 
| cem,e 

Tbe a of the raphe, may be regarded as universally 
next the ventral suture of the carpellary leaf, orin other 
words, next the placenta. For this important fact we are 
indebted to Mr. Brown, who has likewise shewn that all, 
exceptions to this, are only apparent, and originate in a 
torsion of the funicle. Nor is this all, the same illustrious 
Botanist has brought the situation of the raphe into play as 
a character, for he has shewn that true Lonicerez, may be at 
once distinguished from their allies by the reversion in the 
situation of the raphe. And in this point of view the con- 
sideration of the situation of this organ is useful, as proving 
that in Boraginez the ovaria are inverted, while in Labiatæ 
they are erect. 
There is no appreciable difference between. the deve- 
lopment of the ovulum in the two grand divisions of the 
vegetable kingdom. 
The only absolute ddnde: exists in the development 
of the embryo—the preliminary steps being the same in 
both instances. 
The materials from which the foregoing account is drawn 
up, have been in my possession for some time. 
It may be considered presumptuous to give an account of 
phenomena, which have engaged the attention of Mr. Brown, 
M. Brongniart, and M. Mirbel, the accounts of all of whom 
would seem to have been generally adopted, although that of 
M. Mirbel, is — different from that of Mr. Brown. 

