FISSION KATE OF STYLONYCHIA PUSTULATA 



140 p- 



L I 



495 



120 — 



60 



Ltl 



J \ \ I_J 



Fig. 15 Curves of variation of the lines of Experiment 3-A (direct selection 

 of progeny of second wild individual). The ordinates give numbers of lines; the 

 abscissae the number of generations. The continuous line is the curve of the 

 fast set; the broken line, the curve of the slow set. 



Fig. 16 Polygon of the average number of generations per line per three-day 

 period produced by the fast and slow sets of lines of Experiment 3-C (balanced 

 selection after conjugation). The continuous line is the curve of the fast set, 

 the broken line, the curve of the slow set. The ordinates are the averages; the 

 abscissae, the three-day periods. 



two three-day periods and also that there is a marked decrease 

 in both the actual and percentage difference. During the last 

 three of the three-day periods the difference was uniformly in 

 favor of the sixty fast lines and was remarkably constant. 

 Figure 16, the polygon of the average number of generations 

 produced by each set of sixty lines per day during the consecu- 

 tive three-day periods of this experiment, represents this same 

 result graphically. 



Figure 17 -a and 17-6 give the curves of variation from the 

 diverse lines, the former for the first six days, the latter for the 

 last nine days. Why the ex-con jugants of the fast selected lines 

 should for the first five days be slower than the ex-conjugants 

 of the slow selected ones is not clear. But this condition existed 



