PLATE 2 



EXPLANATION OF FIGURES 



N. glauca, first division. X 2000 



20 to 22 Polar views of the metaphase, showing 13 chromosomes. 



23 Side view of initial anaphase. 



24 A, B, C Serial sections of entire spindle in side view, showing 13 chromo- 

 somes. 



25 B Side view showing components of central dyad on different fibers. A. 

 Other chromosomes from the same spindle. 



26 Large compound chromosome in side view at the side of the spindle. The 

 dark and light portions represent similar dark and light areas on the chromosomes. 



27 Large compound chromosome in side view on the top of the spindle. 



28 Large compound chromosome in polar view. 



29 and 30 Early anaphase, side view, showing division of the large compound 

 chromosome. 



31 and 32 Later anaphase, side view, showing both large chromosomes. 



33 Polar view of anaphase. 



34 Late anaphase, showing chromatic substance from the large chromosome 

 streaming down over the spindle fibers. 



150 



