DESCRIPTION OF THE PLATES. 
and relative ske of the stamens. Fig. 4, the pistil enclosed in the calyx, the ovary being 
at first half superior : all nat. size. Fig. 5, two of the stamens, the filaments being nearly 
free to the base : the anther and its mode of attachment are here shown before and behind, 
its two parallel cells being separated by a distinct interval ; the filament is here compara- 
tively narrow. Fig. 6, a longitudinal section of the half-superior unilocular ovary, the 
lower moiety being adnate to the tube of the calyx ; the placenta is central, free, and a 
quarter the length of the cell, and the ovules are attached to its summit in two series, the 
upper series being erect, the lower one suspended ; three of its four incomplete dissepi- 
ments are seen, and the summit of the wall of the ovary is thickened. Fig. 7, the same, 
with the ovules removed, in order to show more distinctly the placenta and incomplete 
dissepiments. Fig. 8, a transverse section of the ovary, cut across the line of the summit 
of the placenta, showing the ovules, the four incomplete cells in the base, and the eight 
nervures of the adnate calyx, four of which afterwards, in the seed, become expanded into 
as many broad wings : all much magnified. Fig. 9, a longitudinal section of the ovarj' 
shortly after the fall of the corolla. Fig. 10, the same, as seen a month after the same 
period ; here the upper free moiety of the ovary has scarcely attained any increment, but 
there has been a considerable downward growth of its lower moiety, by wliich the placenta 
has become drawn to one side, thus assuming a parietal position, and one or two of the 
ovules, being fertilized, have increased in size, while all the others remain abortive and 
unchanged. Fig. 11, the same, as it appears six weeks after the fall of the corolla. Fig. 12, 
the same, after a period of nearly five months, at which time the placenta has grown over 
the ovule, in the form of a parietal ceU, which generally becomes ossified, and the mature 
seed becomes either erect or suspended, accordingly as it has been developed from an erect 
or pendent ovule, as shown in fig. 6 : the external wings are now beginning to appear ; it 
will be seen that up to the latest period there has been no increment of the upper free 
moiety of the ovule, and that the whole extent of development has been confined to the 
extensive downward growth of its lower moiety. Fig. 13, a ripe four- winged seed. Fig. 14, 
a transverse section of the same (the upper portion), shovring the fleshy pericarp with the 
endocarp transformed into an osseous nut, which is unilocular, with two parietal semini- 
ferous pseudo-cells on one of its sides. Fig. 15, the lower portion of the same. Fig. 16, 
a fruit with one of the wings and half of the sarcocarp removed, to show the position and 
relative size of the nut. Fig. 17, the osseous spindle-shaped nut. Fig. 18, a longitudinal 
section of the same, showing the parietal pseudo-cell containing a single seed : all nat. size. 
Fig. 19, longitudinal section of the osseous nut, magnified, showing one of the parietal 
osseous pseudo-cells, containing a single erect ovule : it is seen how the newly formed 
parietal crustaceous cell becomes agglutinated with the osseous endocarp, and how the 
main body of the ovular development remains always unilocular, with the vestiges of the 
now elongated incomplete dissepiments still remaining visible on the side of the pseudo- 
cells ; the axUe thread of nourishing vessels is still to be traced along the outside of the 
pseudo-cells, and in communication with the raphe at the side which always faces that 
fine. Fig. 20, a transverse section of the same, showing two osseous pseudo-cells and two 
other membranaceous cells, where the fertilized ovules have withered after a short period 
of growth : one of the osseous cells contains a perfect erect seed, the other a suspended 
seed ; and in the angle outside of these pseudo-cells is observed the cord of nourishing 
vessels, originally seen in the central placenta of the ovary ; facing this line, the raphe of 
each seed is constantly found communicating with it through the medium of the hHar 
attachment of the seed : all magnified. Fig. 21, a seed, nat. size. Fig. 22, the same (a 
pendent seed), magnified : the hilum is apical, and the vessels of the raphe are confined 
within a longitudinal simple cord, that extends from the base to the apex of the outer thin 
membranaceous tunic or testa. Fig. 23, the same, with the outer tunic removed, and 
