1910] SMITH—ZAMIA FLORIDANA 137 
The next series of slides obtained give further divisions of free 
nuclei and their peripheral position in the cytoplasmic lining, which 
__ Fics. 17, 
with layer of 
- 
18.—Fig. 17, four nuclei of e 
: tiss' 
mbryo sac. 930; fig. 18, embryo sac 
to break down. X250. 
'S now a little thicker. The cytoplasm here is quite foamlike in its 
Structure (figs. 18, 19). Fig. 19 is a detail of the sac and the “spongy 
