88 BOTANICAL GAZETTE [aucust 
Fic. 2. Loose mother skein stage, showing a dome-shaped bipolar spindle 
which is situated entirely within the dark band. 
Fics. 3-5. Successive division stages, showing centrosome-like bodies a 
poles of dome-shaped spindles. 
Fic. 6. Same as above, but having no bodies visible at the poles. 
Fic. 7. Mother star stage; spindle pointed, having centrosome-like 
bodies, and with radiations at lower pole. 
etakinesis stage; microspores separated. 
Fic. 9. Near close of metakinesis; centrosome-like bodies and radi 
tions present. a 
Fig. to. Early stage of second division, showing dome-shaped spindle 
with centrosome-like bodies; dark band not so prominent as in first division. 
11. Showing one cell in a later stage of division than is the other. 
Fics, 12-14. Successive division stages. : 
Fic. 15. Loose daughter skein stage, showing an isolated chromosome; 
spindles parallel. 
Fic. 16. Same as above, showing spindles lying obliquely to one ane 
Fig. 17. Tetrad having nuclei variable in size and showing persisting. 
spindles. : 
Figs. 18-19. Later tetrad stages. 
e another. 
PLATE VIII, 
GS. 20-21. Mother cells with five nuclei, three of which are connectél 
by spindles, showing their common origin. 
1G. 22. Same as above, except that one nucleus did not divi 
division of spore-mother-cell. 
FG. 23. Five nuclei in mother-cell, two pairs of whi 
spindles. 
Fic. 24. Four nuclei in tetrad, two of which are dividing b : 
Fic. 25. Mother-cell with five nuclei; one is dividing by karyokines® 
Fic. 26. Mother-cell with six nuclei; the origin of two not shown. 
Fics. 27-28. Five- and six-celled mother cells. 
FG. 29. Microspore soon after separation. 
Frc. 30. Normal mature pollen grain having one generat 
nucleus. 
Fic. 31. Tube nucleus of pollen grain dividing by direct division. 
Figs. 32, 34. Pollen grains with one generative and two tube nucle! 
Fig. 33. Pollen grain with a very irregular tube nucleus. 
Fic. 35. Pollen grain with three tube nuclei; generative 1 
shown. 
de after fist 
ch are connected bf 
y karyokines® 
ive and one W 
cleus 
Fig. 36. Six tube nuclei in pollen grain. 
