PLATE 6 



EXPLANATION OF FIGURES 



N. indica, first division. X 2000 



81 Side view of metaphase, showing two small chromosomes in the center; 

 the chromosome in light grey is at the same focus as the central ones, and there- 

 fore within the peripheral ring. 



82 Same, only the two central pairs are linearly arranged. The X chromosome 

 is shown at the left and a large double at the right. The light and dark por- 

 tions represent similar light and dark areas seen on the chromosomes. The 

 chromosome in light grey is within the peripheral ring. 



83 and 84 Side views showing X and one double chromosome. 



85 A, B, C Serial sections of entire spindle, showing all the 14 chromosomes; 

 two large doubles in A, two small central ones and another chromosome in light 

 grey at the same focus in B, and X in C. 



86 to 88 Polar views of the metaphase, showing 14 chromosomes. 



89 Side view of anaphase showing division of X. 



90 and 91 Late anaphase, showdng X and large chromosomes in sister cells; 

 both large ones are shown in 91. 



92 A, B, C Serial sections of entire spindle in anaphase, showing all the chro- 

 mosomes in both sister cells. 



93 X chromosome in early prophase, before the spindle is formed. 



94 X chromosome in very late prophase, after the spindle is formed. 



95 X chromosome in metaphase. 



96 X chromosome in anaphase. 



158 



