EFFECT OF CONJUGATION 



291 



tion in the progeny of the conjugants is due mainly to the fact 

 that many of the hnes descended from them multiply but slowly, 

 while others multiply at nearly the same rate as do the progeny 

 of non-conjugants. Among the 59 hnes of non-conjugants, there 

 are but two that gave fewer than 20 fissions in the five weeks, 

 while among the 38 hnes of conjugants that lived through the 

 entire five weeks there are 12 that fall below 20. On the other 



TABLE 4 



Experiment 1. Relative variability in number of fissions for given periods, in those 

 that have conjugated (pairs), and those that have not (split pairs). 



TABLE 5 



Experiment 1. Paraynecium caudaturn. Number of lines that died out during 

 different periods, among those descended from the pairs (conjugation consummated). 



