6 MUTATIONS, VARIATIONS, AND RELATIONSHIPS OF THE OENOTHERAS. 



The coefficients of correlation are as follows : 



A comparison of the coefficients of correlation in the characters of the sev- 

 eral mutants with those of the corresponding characters of Oenothera lamarck- 

 iana shows that in 14 cases out of 27 there is a decrease of correlation in the 

 mutant; in 12 instances there is an increase, and in i the correlation remained 

 the same. These results seem to negative the view that the characters of the 

 Oenothera mutants are generally less closely correlated than those of the parent. 

 However, the differences between the coefficients of the mutants and those 

 of Oenothera lamarckiana are not generally greater than those between the 

 several lots of O. lamarckiana, or between the two lots of 0. rubrinerms, and 

 it is evident that the question is still to be considered undecided, but with 

 the burden of evidence in favor of the view that little or no change takes place 

 in the correlation of parts when mutation changes their proportions. 



