BIPARENTAL INHERITANCE IN PARAMECIUM 



445 



TABLE 48 



Experiment 17. Paramecium caudatum, split pairs. Correlation in number of 

 fissions between the two members (a and b) of 155 split pairs, for the entire 20 

 days {May 9-30) of the experiment. 



inheritance to publish the complete record, as is done for Experi- 

 ment 16 in table 51, but the three correlation tables, supplemented 

 by further facts to be given in the text, are sufficient for present 

 purposes. 



We shall take (1) the distribution of deaths, and (2) the rate 

 of reproduction, in the split pairs. 



Survivals and deaths in the split pairs 



Of the 478 lines with which the experiment began, 57 died out 

 during the first ten days, including both members of 8 split 

 pairs. During the second ten days 42 additional lines died out, 

 with both members of 7 additional pairs. Thus during the 

 entire twenty days, 99 lines died out, including both members of 

 15 split pairs. 



Rate of mortality. The data just given show that the mortality 

 in this experiment was considerably higher than in Experiment 

 16, where we were dealing with pairs that had completed conjuga- 

 tion. In the present experiment, 99 out of 478 members of split 

 pairs, or 20.7 per cent, are dead at the end of twenty days, while 



