82 



SEVENTH REPORT. 



TABLE IV. 



Constants for Variation in Length of Body in Paramccia of Selected Ancestry. Control Series. 



Experiment 1 . 100 hour series 

 Experiment 2 . 200 hour series 

 Experiment 7 . 300 hour series 



Mean. 



221.800 ± .587 

 207.080 ± .518 

 182.200 ± .480 



Standard 

 Deviation. 



19.457+ .415 

 ■17.171 ± .366 

 15i917± .340 



Coefficient of 

 Variation. 



8.772 ± .189 

 8.292 -i .178 

 8.736+ .188 



Turning now to the series in which cane sugar solution was added 

 to the culture fluid we have the frequency distributions given in Table 

 V. 



TABLE V. 



Frequency Distributions. Length of Paramecia of Selected A7}cestry. Sugar Solution added to Culture 



Fluid. 

 Class Unit ^10 milcrons. 



These distributions are shown graphically in Figure 3. The constants 



deduced from them are given in Table VI. 



TABLE VI. 



Constants for Variation in Length of Body in Paramecia of Selected Ancestry. Sugar Series. 



Experiment 1. 100 hour series. 

 Experiment 2, 200 hour series 

 Experiment 7, 300 hour series 



Mean. 



224. 980 ±.533 

 217. 380 ±.592 

 213.340±.601 



Standard 

 Deviation. 



17.680 ±.377 

 19.630±.419 j 

 19.936±.425 ' 



Coefficient of 

 Variation. 



I 



7.859± .169 

 9.030± .194 

 9.345±.201 



It Avill be remembered that the 1,500 individuals of Tables V and V 1 

 all came from the same original ancestor as those in Tables III and T\". 



