442 BOTANICAL GAZETTE ~ [DECEMBER 
Fic. 21. Anaphase; groups of daughter chromosomes become assembled at 
the poles of the spindle. 
Fic. 22. Later anaphase; original nuclear membrane entirely dissolved; 
centrosphere-like structures passing into vaguely outlined protoplasmic masses. 
IGS. 23a, 23b. Two sections of the same daughter nucleus in late anaphase 
viewed from the pole, showing early stage in — of the vacuoles containing 
nuclear sap. 
Fics. 24-24c. Three sections of the same daughter nucleus ae after 
telophase; nuclear membrane clearly formed and two nucleoli prese 
Fic. 25. Resting condition of daughter nucleus, showing linin ate and 
nucleolus 
PLATE XXI1, 
Mitosis in the vegetative cells of the male plant. 
Fic. 26. Apical cell of main filament; resting nucleus of an apical cell, show- 
ing linin network. 
1G. 27. The same; network becoming coarser. 
Figs. 28-35. Apical cells of developing hairs. 
Fic. 28. Chromatin granules aggregated into 20 prochromosomes. 
Fic. 29. Prophase; 20 chromosomes clearly present; a centrosome-like body 
at each pole. 
Fic. 30. Metaphase showing equatorial plate; centrosphere-like structures 
at the poles of spindle. 
Fic. 31. The polar view of equatorial plate showing 20 chromosomes. 
1G. 32. Late metaphase; two groups of daughter chromosomes just separ- 
ating. 
Fic. 33. Anaphase; two groups of daughter chromosomes separated by a 
large vacuole which enters between them 
Fic. 34. Telophase; nuclear membrane around the daughter nuclei. 
Fic. 35. Later stage than the previous figure; cleavage furrow proceeding 
inward so as to divide the apical cell. 
Mitosis in the vegetative cells of female plants. 
Figs, 36-42. Apical cells of developing hairs. 
Fic. 36. Prophase of nucleus; centrosome-like body present at the pole. 
Fic. 37. Metaphase, showing equatorial plate; centrosphere-like structure 
conspicuous. 
Fic. 38. The polar view of metaphase. 
Fic. 39. Late metaphase 
Fic. 40. Anaphase. 
Fic. 41. Anaphase; the vacuole beginning to intrude between the groups of 
daughter chromosomes. 
Fic. 42. Telophase; cleavage furrow appearing between the two daughter 
nuclei. 
