EXPLANATION OF THE PLATES, 



SCII LEI DEN'S THE AT I SI.. 



PLATE I. 



Fig. 1. Cellular tissue from the embryo -sac of Chamadorea 

 Schiedeana in the act of formation, a. The inner- 

 most mass, consisting of gum with intermingled 

 mucous granules and cytoblasts. b. Newly formed 

 cells, still soluble in distilled water, c-e. Further 

 development of the cells, which, with the exception 

 of the cytoblasts, may still coalesce, under slight 

 pressure, into an amorphous mass. 



2. The formative substance from fig. 1, a, more highly 



magnified, gum, mucous granules, nuclei of the 

 cytoblasts, and cytoblasts. 



3. A single and as yet free cytoblast, still more highly 



magnified. 



4. A cytoblast with the cell forming upon it. 



5. The same, more highly magnified. 



6. The same. The cytoblast here exhibits two nuclei, 



and is delineated in 



7. isolated after the destruction of the cell by pressure. 



8. The same cellular tissue in a higher degree of deve- 



lopment than that represented by fig. 1, e. The 

 contiguous cell-walls have already united. Bj 

 making a transverse section, it may be distinctly 

 perceived that the cytoblast is enclosed in the cell- 

 wall. 



9. Cells from a delicate transverse section of the almost 



matured albumen. 



