FISSION RATE OF STYLONYCHIA PUSTULATA 



473 



the set from that one, for we have four lines of the fast set that 

 run all the way through and three of the slow hues that do the 

 same. Table 7 shows the total number of generations produced 

 by each line of both sets. For the fast set these totals vary from 



't 



Fig. 7-a Polygons of the average number of generations per line per ten-day 

 period produced by the fast and slow sets of lines of Experiment 1-B during its 

 nine consecutive ten-day periods of balanced selection. The continuous line 

 shows the averages for the fast set, the broken line the averages for the slov/ 

 set. The ordinates show the differences of the averages, the abscissae the ten- 

 day periods. 



Fig. 7-6 Curve of the difference between the average number of generations 

 per line per ten-day period produced by the fast and slow sets of lines of Experi- 

 ment 1-B during its nine consecutive ten-day periods of balanced selection. 

 The ordinates show the differences of the averages in favor of the fast set, the 

 abscissae the consecutive ten-day periods. 



