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BOTANICAL GAZETTE 



Fig. 13— Fertilization; pollen tube (pt) seen in protoplasm of one of the 

 synergids and male nucleus fusing with egg nucleus; X 12 10. 

 Fig. 14.— Endosperm after first nuclear division; X650. 



Fig. 15a.— Young embryo (emb) at the chalazal end of the embryo sac; 

 degenerating antipodals (ant) below it; X520. 



embryo sacf X ^ ^ ^ ^ ^ ^ end ° SPerm 



Fig. 15c— Unfertilized egg in the same embryo sac; X520. 

 Fig. 16. — Young proembryo; X520. 



Fig. 17.— Two successive sections (a, b) showing early stage in endosperm 

 development; X520. 



Fig. 18— Endosperm showing enlarged basal cells; X122. 



Fig. 19.— Same, in which ordinary endosperm cells have imitated the 

 appearance of the giant cells. 



