PLATE 2 



EXPLANATION OF FIGURES 



7 Side view of first maturation spindle, 11 chromosomes present. 



8 Same as above, with 11 chromosomes present. The X- and Y-components 

 have separated. 



9 Same as above. Two of the tetrads have been displaced. 



10 Same as above. Two of the chromosomes which in the spindle under the 

 others have been drawn out to one side in order to show their shapes. 



11 Same as above, showing 11 chromosomes. Only the X-component is 

 visible. 



12 Same as above, showing with especial clearness the morphology of the 

 X-Y chromosome complex. Not all chromosomes are present in this spindle. 



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