EFFECT OF CONJUGATION 



349 



if one compares, among the pairs (table 34) line 1 with Hne 6, and 

 the latter again with line 4. Line 1 ax shows a total during the 

 twenty-four days of 33 fissions, Hne 6 ax of 16 fissions; line 4 ax 

 of 13 fissions. Corresponding differences are shown in the other 

 divisions of lines 1, 6 and 4, the differences extending even to 

 lines descended from the two mates of a pair. Thus line 1 ax has 33 

 fissions; line 1 hx, descended from its mate, 31 fissions; line 6 ax 

 has 16 fissions; line 6 bij, descended from its mate, 17 fissions; 

 line 4 ax has 13 fissions; line 4 bx, descended from its mate, has 12. 

 If we compare similarly the two lines x and y, derived from a single 

 member of a pair, we find that their fission rates are close together, 

 while lines derived from different pairs differ greatly. 



Certain peculiarities of the fission rate are evident. During, 

 the first five or six days after the beginning of fission the different 

 lines descended from the conjugants are more nearly uniform in 

 their rate. Then a number of the lines, such as those belonging 

 to pairs 4, 5, 15 and 26, show a marked decrease in the fission 



TABLE 23 



Experiment 15; Pure strain E. Constants of variation in fission, for the li7ies 

 descended from conjugants (pairs), and fur those descended from non-conjugants 

 (split pairs), for certain periods of time. The total time is, for the pairs, 24 

 days, for the split pairs, 21 days. The first half includes for the pairs the twelve 

 days, August 27 to September 6; for the split pairs eleven days, August 28 to Sep- 

 tember 6; the second half, September 8 to 18 (pairs), September 8 to 16 (split pairs) . 



