188 



CARL DOWNEY LA RUE 



TABLE 12 (continued) 

 Generation 9 



Generation 10 



Means of all cultures in experiment 1 



Difference between plus selections and minus selections =0.05 7 + 0.03 8 

 Difference between plus selections and intermediate group =0.10 + 0.058 

 Difference between minus selections and intermediate group =0.039 + 0.054. 



