EXPLANATION OF PLATE II. 



FIGS. 13, 14 AND 15. Lateral views of the spindle. Chromosomes show various 

 shapes. 



FIG. 1 6. Lateral view of chromosomes showing one ring broken on one side. 

 FIG. 17. Metaphase showing a ring separating. 



FIG. 18. Groups a, b and c show different shapes of chromosomes. Each group 

 was drawn from a single nucleus. Group a is from very late prophase ; that is, not 

 all the chromosomes have reached the equator of the spindle. The third chromosome 

 in b is the accessory. 



FK;. 19. A drawing made from a smear preparation showing the various shapes. 

 The chromosome marked it has the ends crossed and may be the result of pressure on 

 the nucleus. 



FIG. 20. Anaphase showing accessory nearer one pole and outside the spindle. 

 FIG. 21. Later anaphase, accessory caught in the center and showing constrictions. 



FIG. 22. Telophase showing accessory separated by cell walls. Magnification, 

 1, 860 diameters. 



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