EFFECT OF CONJUGATION 



353 



As table 25 shows, the Hnes derived from conjugants give an 

 extremely high correlation. In other words the fact that we are 

 here dealing with lines differentiated in inherited characters is 

 demonstrated by this method as well as by the other evidence. 

 After passing the disturbance due to the direct physiological 

 effect of conjugation, the correlation between successive periods 

 rises to 0.8957 (practically to 0.9), an extraordinarily high coef- 

 ficient. The correlation between the sister lines x and y is like- 

 wise 0.9, showing an almost perfect correspondence. ' 



In the lines descended from the non-conjugants, on the other 

 hand, there is no correlation between the numbers of fissions in 

 successive periods, the coefficients being practically 0. That is, 

 so far as this method can show, the diversities in fission rate are 

 not inherited, among the members of a pure race which have not 

 conjugated. 



On the other hand, the numbers of fissions for the sister 

 Unes X and y, do give a small coefficient of correlation (0.2119). 



TABLE 25' 



Experiment 15. Pure strain E. Coefficients of correlation in number of fissions, 

 for successive periods, and for the sister lines x and y, in the descendants of 

 conjugants (pairs) and of non-conjugants (split pairs). 



1 For the pairs the 'first half comprises the 12 days August 27-September 6 

 of table 34; the 'second half the remaining 12 days. For the split pairs the 

 'first half is 11 days, August 2S-September 6; the 'second half is the remain- 

 ing 10 days. The 'second third' comprises September 4-10 (pairs) or September 

 3-8 (split pairs); the 'last third,' September 12-18 (pairs), or 10-16 (split pairs). 

 The total time is, for the pairs, 24 days; for the split pairs, 21 days. The cor- 

 relation tables for successive periods are formed by taking the number of 

 fissions of a given line in an early period and entering this on the table in 

 connection with the number of fissions for the same line in the later period. 



