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MORPHOLOGY OF GYMNOSPERMS 



egg (46). This view is confirmed by cases in Pinus in which the 

 ventral canal cell is very much larger than usual, and its nucleus has 

 reached the size of the egg nucleus and has passed through the same 



Figs. 293-297. — Pinus Laricio: formation of ventral canal cell; fig. 293, typical 

 division, the ventral canal nucleus beginning to disorganize and the egg nucleus begin- 

 ning to enlarge; X500; fig. 294, disorganizing ventral canal cell; Xsoo; fig. 295, an 

 unusually large spindle in cutting ofiE ventral canal cell, the two nuclei being the same 

 size and showing the same developmental changes; Xsoo; fig. 296, a large ventral 

 canal cell formed in this way; X500; fig. 297, the wall separating the ventral canal 

 cell from the egg has broken. down, leaving both nuclei free in the cytoplasm of the 

 egg; nv, nucleus of ventral canal cell; no, nucleus of egg; X 100. — After Chamber- 

 lain (si). 



