1 7- 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. 
