FISSION RATE OF STYLONYCHIA PUSTULATA 



467 



TABLE 5 



Experiment 1, Part 3: Actual number of generations and of selections per ten-day 

 period per line of the third part of Experiment 1, that is, the sixth, seventh and 

 eighth ten-day periods of continuous opposite selection, with the excess in genera- 

 tions produced in favor of the fast-selected set 



LINKS NUMBER 



Sixth 10-day Period : 

 Fast : 



Selections 



Generations 



Slow: 



Selections 



Generations 



Excess in generations in 



favor of the fast 



Seventh 10-day Period: 

 Fast: 



Selections 



Generations 



Slow: . 



Selections 



Generations 



Excess in generations in 



favqr of the fast 



Eighth 10-day Period: 

 Fast : 



Selections 



Generations 



Slow : 



Selections 



Generations 



Excess in generations in 



favor of the fast 



Fast : 



Total for 30 days 



Slow : 



Total for 30 days 



Difference 



13 

 62 



5 

 44 



18 



28 

 121 



23 

 69 



52 



32 



168 



31 

 132 



36 



351 



247 

 104 



11 TO 20 



14 



65 



17 



22 

 101 



25 



88 



13 



42 



222 



31 

 133 



89 



388 



271 



117 



AVERAGE PER 

 LINE PER 

 TEN-DAYS 



6.36 



4.83 

 1.53 



10.87 



7.46 

 3.41 



20.87 



13.30 



7.56 



38.10 



25.73 

 12.37 



Experiment 1-B. Balanced selection, January 23 to April 22, 

 1914. 



At the close of Experiment 1, part 3, the two sets of lines of 

 that experiment had been under continuous opposite selection 



THE JOURNAL OP EXPERIMENTAL ZOOLOGY, VOL. 19, NO. 4 



