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H. S. JENNINGS 



week, where the rate is nearly the same, with a shght excess in 

 favor of the conjugants. But as we have already noted, the 

 animals were changed and (records made) but once that week, 

 and in consequence there was almost no multiplication; the 

 figures for that week are of no significance. In all the other 

 cases (14 out of 15) the non-con jugants show a greater rate of 

 fission, the excess varying from 6 to 85 per cent, with an average 

 of 23 to 31 per cent. 



The split pairs and the free individuals show no significant 

 difference so far as rate of fission is concerned; so that the speci- 

 mens that have taken the first steps in conjugation do not differ 

 in this respect from those that have not. 



TABLE 6 

 Experiment 2. Mean number of fissions for each week, and for certain other periods, 

 in the three sets, together loith a comparison of all that have conjugated with all 

 that have not. 



