Caroline Pellew and Eva Richardson Sansome 41 



It is interesting to notice that 6151/30, which is a hybrid, has a 

 terminalisation coefficient of 0-48 and the Early Giant rogue has a ter- 

 minaUsation coefficient of 0-38. Thus in the hybrid 615^ there is a slight 



«.> ** ** 



Fig. 4. Two first division anaphases from 532V30. x 4000. 



decrease in the mean chiasma frequency and an increase in the ter- 

 minalisation coefficient, as compared with 532^- This result is similar to 

 the behaviour in Triticum-Aegilops hybrids as compared with the parent 

 forms, where the correlation between decreased chiasma frequency and 

 increased terminalisation is more striking (Darhngton, 1930 b). 



