178 BOTANICAL GAZETTE (MARCH 
Fic. 22. Archegonium consisting of two neck cells and central cell; the 
nucleus of the central cell has rounded out, and is passing downward to the center 
of the cell and taking on the appearance of an egg nucleus; July 26, 1904. X 460. 
Fic. 23. Median longitudinal section of female gametophyte showing egg, 
remains of a neck cell, and antipodal haustorial cells; the tip of the pollen tube 
in contact with the egg contains stalk and tube nuclei, functional and functionless 
male cells; the upward growth of the endosperm cells forms a sheath around 
the pollen tube; August 12, 1904. X 460. 
PLATE III. 
1G. 24. Fertilization; the male nucleus is in contact with the egg nucleus; 
the cytoplasm of the male cell is closely applied to the egg nucleus; the function- 
less male cell, and tube and stalk nuclei are in the upper part of the egg cytoplasm; 
the cavity in the egg cytoplasm is caused by the inrush of the contents of the 
pollen tube; August 12, 1904. X 460. 
Fic. 25. Two-celled proembryo; the dense cytoplasmic mass surrounding 
the ey is — in greater part derived from the male cytoplasm; August 
27, 1904. 
Fic. - , eee proembryo; walls coming in; August 12, 1904. 40. 
Fic. 27. Proembryo shortly after walls are laid down; the proembryo passes 
X 460. 
Fic. 28. Cross-section through suspensor cells; September 12, 1904- X 460. 
Fic. 29. Proembryo showing elongation of suspensor cells; April 7, 1994 
Fic. 30. Endosperm cells encroaching on perisperm; August 12, 1904- ee 
Fic. 31. Endosperm cells which have ceased to encroach on perispe!™ 
August 12, 1904. X460. 
— 
