PLATE IV. 



Fig. 30. Two sections of an embryo-sac of ^. simplex in which the endosperm 

 filled the sac. The egg apparatus {0) was at the base. Three large 

 nuclei, apparently about to fuse, were present in one of the cells ; two 

 of these are shown in a. x 90. 



Fig. 31. Group of three small nuclei from another cell of the same sac. x 250, 



Fig. 32. Two-celled embryo {em.) and synergidse of ^. simplex. x 200. 



Fig. 33. Lower part of the same embryo-sac, showing the young endosperm. 



Fig. 34. Embryo-sac of ^. Jzw/Z^jT, containing a one-celled embryo (^w.). x 120. 



Fig. 35. Large fusion-nucleus made up of three nuclei. x about 500. 



Fig. 36. Embryo-sac of A. modestttvi, with egg apparatus at the base, and two 

 free nuclei {en.). x 120. 



Fig- 37' Chalazal end of an older embryo-sac of the same species ; o, the egg (or 

 perhaps one-celled embryo). x 120. 



Fig. 38. An older embryo-sac of A. modestum with a two-celled embryo {em.). 

 X 120. 



Figs. 39; 40. Fusion nuclei from endosperm -cells, x 250. 



Fig. 41. Embryo-sac of ^. inodesium, with a young embryo [em.). The primary 

 endosperm in the concave side of the sac is conspicuous. x 120. 



