:^^ 









« •«*» 







The nuclear membrane has disappeared, and the chromosomes are migrating 

 towards the spindle, (d) Metaphase. 15-8 minutes later than (o). Many 

 of the chromosomes are not yet on the equator of the spindle. 

 Jio. 15 Prophase of a binucleate mouse spleen cell in culture. X 2000 

 (reduction 7/9). (0) Nucleoli and nuclear membrane are still present, (b) 9-5 

 minutes later than (0). The chromosomes from both nuclei are assembling 

 on a single spindle. 



