350 



H. S. JENNINGS 



rate, which persists throughout the remainder of the experiment. 

 In other Unes, such as those derived from pairs 1, 2, 3, 7, 12, the 

 rate remains high throughout the entire period. 



The inherited differences between the hnes will perhaps be 

 best brought out if we divide the twenty-four days of the experi- 

 ment into four periods of six days each, and give the number of 

 fissions for each of these periods, for a number of diverse lines. 

 We shall re-group these lines in such a way as to bring out strongly 

 the diversities. The results are shown in table 24. It is observ- 

 able, for example, that in every one of these four periods the line 

 3 ax has a greater rate of fission than 6 ax ; similarly 3 ay and 

 3 bx show in every period a greater rate than 6 ay and 6 bx. 

 Comparison of other lines shows the same relations. 



TABLE 24 



Experiment 15. Pure strain E. Fissions in certain of the conjugant lines, for four 

 successive periods of six days each, so arranged as to exhibit the differences between 

 the lines. 



