364 



H. S. JENNINGS 



I and 15. With this table may also be examined tables 9, 10, 



II and 20, which give the same data for various other experiments. 

 The spreading out toward the lower end of the range in the 



lines descended from pairs is very striking in table 28. In some 

 cases it appears that the lines descended from conjugants tend 

 to differentiate into two groups, one with a low fission rate, the 

 other with a higher one. This is particularly notable in the data 

 for Experiment 15, in table 28, but is observable also in Experi- 

 ment 1. 



TABLE 27 



Cojyiparative range of variation in lines descended from conjugants, and in those 

 descended from non-conjugants, for fissions in a given period. 



^ In the last entry, for experiment 15, the time for the conjugant lines is 24 

 days, that for the non-conjugants but 21. If we reduce by one-eighth the fis- 

 sions for the conjugants, they will then be comparable with those for the non- 

 conjugants; this gives the figures shown for this case in parenthesis. 



