H. G. MAY. 



20 40 60 60 100 120 140 160 180 200 220 

 Stock 



SO 40 60 80 100 ISO 140 160 ISO 200 220 240 260 280 }00 320 340 360 .580 400 

 Stock 



20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 



20 40 60 80 100 120 140 1&0 180 200 220 240 260 



FIG. 3. The effect of selection on range and average. A, high and low lines 

 in VBa; B, males in Ba, high and low lines; C, high and low lines in Ba; D, females 

 in Ba, high and low lines. A and C are plotted for the means between male and 

 female averages. These figures do not represent individual lines, but include all 

 lines except reverse selections for the generations indicated. The heavy hori- 

 zontal lines indicate the range, the heavy vertical lines, the averages. The heavy 

 interrupted vertical lines merely connect the initial and final stock averages and 

 do not indicate the averages of the stock at intermediate points. The fine slanting 

 lines connect the extremes of the parents with those of the offspring while the 

 fine interrupted lines connect the averages of the parents with those of the offspring. 

 The facet numbers are indicated at the bottom, the generations at the left hand 

 side. 



