Races of Paramecium. 



535 



TABLE 5 



Numbers of fis.sions per week, in the diverse races of the Caudatum and Aurelia 

 groups, when cultivated under uniform conditions. 



The two original individuals of each race are designated a and h, respectively, 

 and the two series from each of these are designated ai and ai) hi and 62. Numbers 

 in parentheses are for lines that did not live throughout the experiment. The 

 braces following certain numbers show that the line in question was here divided 

 (owing to death of the other line), so that the two following lines are derived from 

 this one. Thus, in the race L2, the line at died after the second week, and was 

 replaced by again taking a specimen from the line a,. 



