PLATE 9 



Fig. 1. Pollen mother-cells iu the metaphase of the heterotypic division, 

 both polar and longitudinal views of the spindle. The reduced number of chro- 

 mosomes is clearly discernible in at least one of the division figures. Collected 

 October 21, 1914. 



Fig. 2. Portion of a mature loeule showing parietal tissue and a few mature 

 pollen grains. Collected March 11, 1916. 



[66] 



