17. The pollen masses of one cell of the anther drawn asunder; magnified 
8 diameters. 
18. A group of pollen grains, bursting at the time of fecundation ; mag¬ 
nified 200 diameters. 
19. Some particles of the mucous substance of the stigma; magnified 
200 diameters. 
20. Some utriculi from the lining of the stigmatic channel, as they 
appear at the time of fecundation ; magnified 200 diameters. 
