340 THE AMEBIC AX XATURALIST [Vol. XL VI 



TABLE VII 



Coefficient of variation. \ + I'Jm ± L724° 

 USHC series: 



Standard deviation - 0.2459 ± 0.1442 



Coefficient of variation +4.549 ± 1.830 



Ancestors well fed for two generations : J 

 USHHC series: 



Mean . . . j - 1.6629 ± 0.2054 



Coefficient of variation - 0.245 ± L859 



1 f.-d i 



ati.^i. 



Mean. . . 



FStfSeries 



Standard 

 Coefficiem 



/ -////. - , 



All these are negative. There are no statistically signifi- 

 cant positive differences, the actual values being .013 

 ± .212, .348 ± .297, and .662 ± .334. The two larger of 

 these occur in the White Flageolet series. The mean for 

 the ten direct comparisons is — .589 pods. 



Of the ten cross inter-ramal comparisons, five are neg- 

 ative and five are positive ; six are significant with regard 

 to their probable error, four with the negative and two 

 with the positive sign. In both cases of positive differ- 

 ences (i. e., where the seeds from starved ancestors pro- 

 duced more pods than those from fed ancestors) the seed 

 from the fed plants was a year older than that from the 

 starved plants. The average for the cross comparisons 

 is— .262 pods. 



