EFFECT OF CONJUGATION 



309 



TABLE 11 



Experiment 5. Paramecium, aurelia. Number of fissions for the descendants of 

 pairs and split pairs, during the six days from January 29 to February 4, 1910. 



TABLE 12 



Experiment 5. Summary of results as to mortality, rate of fission and variability, 

 in conjugant and non-conjugant lines, for the six days of the experiment. 



cient of variation being more than twice as great as for the non- 

 conjugants. 



3. The mortaUty is higher among those that have conjugated. 



Experiment 6: March 5 to June 25, 1910: Paramecium aurelia 



From March 5 to June 25, 1910, a period of sixteen weeks, a 

 further experiment was carried on with this pure hne k, giving 

 results as to the difference between those that have conjugated 

 and those that have not. The experiment was primarily a study 

 of the fission rate and its inheritance in different races and under 

 different conditions, so that it included a large number of lines 

 of propagation, of diverse character. Among these were twelve 

 lines from the same culture, six beginning with members of pairs 

 that had just conjugated, and six others derived from individuals 

 that were beginning conjugation, but were separated before the 

 process had been accomplished (split pairs). It is only with the 

 results from these twelve sets, bearing on the effects of conjuga- 

 tion, that we shall deal here, reserving the remainder of the 

 experiment for a paper dealing with the inheritance of the rate 

 of fission. 



