17. A longitudinal section of the apex of the same, cut in the direction
from A to B of fig. 16; magnified 20 diameters.
18. A group of nearly ripe seeds; magnified 200 diameters.
19. A longitudinal section of a seed, apparently abortive, and almost
filled with small globules, which consist of very minute fine yellow
grains ; magnified 200 diameters.
20. Two unimpregnated ovula ; magnified 200 diameters.
