( 



\ 



B'- 





/ 



/ 







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r 



-\ 



^, 



V 



^^^^ 



X 



Plate VII 



No. II Mitosis in a fibroblast of Triton in tissue culture X 1200 (reduction 

 6/7). Culture by Miss M. M'E. Preston. (0) Early prophase. The nucleoli 

 have already disappeared, (b) 5 J minutes after (a). The chromosomes are 

 now distinct; in some the split is recognizable, (c) 8^ minutes after (a). 



{Continued on opposite page.) 



