136 BOTANICAL GAZETTE [AUGUST 
Fic. 5.—Synaptic knot complete; integument much older. 
Fic. 6.—Metaphase; thirteen chromosomes; — spindle. 
Fic. 7.—Spindle for division of mother cell. 
Fic. 8.—Mother cell in same stages as fig. 7, but integuments much farther 
advanced. 
Fic. 9.—Late anaphase; no evidence of wall formation. 
Fic. 1o.—Late telophase; wall separating the daughter nuclei. 
Fic. 11.—Two daughter cells 
Fic. 12.—Two daughter cells, one of which is disintegrating. 
Fic. 13.—Two daughter cells in mitosi 
Fic. 14.—Two daughter cells in telophase with walls forming; these are the 4 
megaspores. 
Fic. 15.—Two daughter nuclei with no wall separating them; traces of the 
spindle still present. 
Fic. 16.—Two daughter nuclei with no separating wall, but one of them 
larger than the other. 
Fic. 17—Chalazal daughter cell in telophase, with no trace of wall; micro- 
pylar daughter cell with chromosomes formed for division. 
Fic. 18.—Chalazal daughter cell in telophase, with beginning of wall forma- 
tion; micropylar daughter cell shows a slight thickening of the spirem. 
PLATE VIII 
Fic. 19.—Chalazal daughter cell in prophase; — short and thick; micro- 
pylar daughter cell in late telophase with wall forming. 
IG. 20.—Two megaspore nuclei of equal size; micropylar daughter cell 
undivided. 
Fic. 21.—Embryo sac beginning to increase in size; one megaspore nucleus 
beginning to show evidence of mitosis; another megaspore nucleus disintegrating 
within the sac; the two megaspore nuclei from the micropylar daughter cell also 
csntegratng, with slight traces of the a still present. 
Fic. 22.—About the same stage as fig. 
FIG. 23. aac megaspore nuclei, one ra each of the ‘Sane cells disin- 
tegrating with its own cytoplasm, the other one in each case in good condition for 
development, although the chalazal nucleus is the larger. 
Fic. 24.—Micropylar daughter cell with chromosomes formed for mitosis; 
one megaspore nucleus in sac developing, the other already divided, and both 
nuclei disintegrating. 
Fic. 25.—Chalazal megaspore nucleus with spindle; the other megaspor’ 
nucleus in the sac in late spirem, or metaphase; the micropylar daughter - 
nucleus in spirem stage. 
Fic. 26.—T wo sporogenous cells in one ovule. 
Fic. 27.—Two mother cells in one ovule. 
Fic. 28.—Two mother cells with nucellar tissue between them. 
Fic. 29.—Two mother cells 
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