104 MEWS IS IN DIPLOIDS AND POLYPLOIDS 



especially where the chromosomes are small, and this interpretation 

 has often been put upon such configurations. Comparative study 



II 



A 



i^5*«$m 



/6. 



c 



(J- 



15 



D 







Fig. 32. — The eight paired chromosomes of Campanula persicifolia 

 drawn separately, at successive stages between diplotene and 

 metaphase to show the changes undergone with complete 

 terminalisation. The numbers of chiasmata, total and terminal, 

 in each nucleus are given at the side. D. is the same stage as 

 C. The nucleolus is shown in outline. X 3000 (from Gairdner 

 and D., 1931.) 



shows that a different interpretation is possible. This will now be 

 considered. 



(vi) The Movement of Chiasmata. In Fritillaria the change 



