312 



H. S. JENNINGS 



were cultivated six weeks longer, making a total of sixteen weeks 

 or 112 days. The comparative rates of reproduction for this 

 period, as weU as for the entire, time, are shown in table 15. One 

 point in this table requires explanation. During this period of 

 forty-four days there were left of each set for various purposes 

 separate lines of propagation which lasted less than the total 

 period; for example, one line was continued seven days, another 

 twelve, et cetera. These diverse periods have been summed for 



TABLE 14 



Experiment 6. Comparative rates of fission for certain lines that had conjugated 

 March 4, and for others that were prevented from conjugating at that time. The 

 number of fissions is given by periods of two weeks, for weeks 6 to 9; also for the 

 last 31 days of a period of 68 days; and for the entire period. 



