ON THE EMBRYO OF TROP(EOLUM MAJUS. 627 
at whose lowest extremity is found the nascent embryo, 
with a portion of its sac, from a flower after the corolla 
is withered. 
Fic. 6. This section shows the upper part of an ovule in a 
more advanced state; e, the globular extremity which after- 
wards becomes the embryo. The processes above it are 
still enclosed within the coats of the ovule; f, the process 
which perforates the coats of the ovule. A separate repre- 
sentation of these parts is given at fig. 8. 
. Fie. 7. Section shewing a carefully drawn representation 
of the placental tissue, through which the process from the 
embryo finds its way towards g, and subsequently extends its 
course, parallel with the axis of the carpella, to h, along 
a channel lying within the carpellary integument ; i indicates 
the place where Schleiden and Giraud imagine the existence 
of “the conducting channel" from the style to the micro- 
pyle; v, in this, and in other figures, shows the bundle of 
- vascular tissue which proceeds from 4, the lowest point of at- 
tachment of the carpel, to n, the base of the ovule. 
Tas. XXIII. 
Fic. 8. Section of a carpel still more advanced: the 
branch, f, has perforated the coats of the ovule, below the 
micropyle, a ; the natural size of the carpel is shewn at fig. 9. 
The albuminous substance of the nucleus is now become cor- 
rugated, and the embryo-sac is continuous with it, following 
all its convolutions. 
Fra. 9. Section of a carpel still more advanced, shewing a 
section of the young embryo, with rudimentary cotyledons 
and plumule; also the two root-like processes, which have 
now attained their full length. The circumambient process, 
which has passed down the external face of the ovule to its 
base, has in this instance penetrated the tissue of the carpel 
at 0; g is the prolongation of the process marked in the last 
figure, with the same letter. a e 
Fic. 10. Section of a carpel nearly ripe. Here, the upper 
